A running program is called a process. On macOS, Linux, and Microsoft Windows, every process has a unique identifying number called a PID. “Unique” means that you never have two processes running at the same time with the same PID number. Similiarly, you never have two motor vehicles running at the same time with the same New York State license plate.
The processes are organized into a family tree.
In other words,
every process has a parent process,
and a process can have one or more child processes.
For example,
Google Chrome
(PID 552)
has eight children.
Can you find them?
And my
Terminal
(PID 652)
has two children, because I currently have two Terminal windows open.
Can you find them?
The process at the top of the tree is always the process whose PID is 0. This process is its own parent. No other process is its own parent.
Each line output by
ps
(except for the header line)
consists of the PID number of a process,
the PID number of the parent of that process,
and the process’s command line.
If the name of the command in the command line ends with a “d”
(e.g.,
/usr/sbin/syslogd
),
then the process is probably a
dæmon.
ps -A -o 'pid ppid command'
PID PPID COMMAND 1 0 /sbin/launchd 49 1 /usr/libexec/UserEventAgent (System) 50 1 /usr/sbin/syslogd 52 1 /System/Library/PrivateFrameworks/Uninstall.framework/Resources/uninstalld 53 1 /usr/libexec/kextd 54 1 /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/FSEvents.framework/Versions/A/Support/fseventsd 56 1 /System/Library/PrivateFrameworks/MediaRemote.framework/Support/mediaremoted 59 1 /System/Library/CoreServices/appleeventsd --server 60 1 /usr/libexec/configd 61 1 /System/Library/CoreServices/powerd.bundle/powerd 62 1 /usr/libexec/mobileassetd 67 1 /usr/libexec/logd 71 1 /usr/libexec/airportd 73 1 /usr/libexec/warmd 74 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Support/mds 78 1 /System/Library/CoreServices/iconservicesd 79 1 /System/Library/CoreServices/iconservicesagent 82 1 /usr/libexec/diskarbitrationd 85 1 /usr/libexec/coreduetd 86 1 /usr/libexec/wdhelper 91 1 /usr/libexec/opendirectoryd 92 1 /usr/sbin/wirelessproxd 94 1 /System/Library/PrivateFrameworks/ApplePushService.framework/apsd 95 1 /System/Library/PrivateFrameworks/Noticeboard.framework/Versions/A/Resources/nbstated 96 1 /System/Library/CoreServices/launchservicesd 97 1 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/Resources/usbmuxd -launchd 98 1 /usr/sbin/securityd -i 100 1 /usr/libexec/locationd 102 1 /usr/libexec/DuetHeuristic-BM 103 1 /usr/libexec/displaypolicyd -k 1 104 1 /usr/sbin/blued 105 1 autofsd 109 1 /System/Library/PrivateFrameworks/GenerationalStorage.framework/Versions/A/Support/revisiond 110 1 /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow console 111 1 /System/Library/CoreServices/logind 112 1 /usr/sbin/KernelEventAgent 114 1 /usr/libexec/hidd 115 1 /usr/libexec/corebrightnessd --launchd 116 1 /usr/libexec/AirPlayXPCHelper 117 1 /usr/sbin/notifyd 118 1 /usr/sbin/distnoted daemon 124 1 /usr/sbin/cfprefsd daemon 149 1 /System/Library/CoreServices/coreservicesd 150 1 aslmanager 152 1 /System/Library/Frameworks/Security.framework/Versions/A/XPCServices/authd.xpc/Contents/MacOS/authd 155 1 /System/Library/Frameworks/PCSC.framework/Versions/A/XPCServices/com.apple.ctkpcscd.xpc/Contents/MacOS/com.apple.ctkpcscd 159 1 /System/Library/Frameworks/CryptoTokenKit.framework/ctkd -s 161 1 /usr/libexec/trustd 174 1 /usr/libexec/sandboxd 183 1 /System/Library/PrivateFrameworks/SkyLight.framework/Resources/WindowServer -daemon 184 1 /usr/sbin/mDNSResponder 189 1 /usr/libexec/lsd runAsRoot 192 1 /usr/sbin/mDNSResponderHelper 198 1 /usr/libexec/findmydeviced 204 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mds_stores 207 1 /System/Library/PrivateFrameworks/WirelessDiagnostics.framework/Support/awdd 209 1 /usr/libexec/amfid 300 1 /System/Library/PrivateFrameworks/AmbientDisplay.framework/Versions/A/XPCServices/com.apple.AmbientDisplayAgent.xpc/Contents/MacOS/com.apple.AmbientDisplayAgent 302 1 /usr/sbin/coreaudiod 303 1 /usr/sbin/systemstats --xpc 304 1 /System/Library/CoreServices/CrashReporterSupportHelper server-init 305 1 /usr/libexec/nsurlsessiond --privileged 306 1 /usr/libexec/nehelper 307 1 /usr/sbin/ntpd -c /private/etc/ntp-restrict.conf -n -g -p /var/run/ntpd.pid -f /var/db/ntp.drift 308 1 /usr/libexec/corestoraged 309 1 /usr/libexec/usbd 310 1 /usr/libexec/thermald 311 1 /System/Library/CryptoTokenKit/com.apple.ifdreader.slotd/Contents/MacOS/com.apple.ifdreader 312 1 /System/Library/Frameworks/CoreMediaIO.framework/Resources/VDC.plugin/Contents/Resources/VDCAssistant 320 1 /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/CVMServer 323 1 /System/Library/Frameworks/CoreAudio.framework/Versions/A/XPCServices/com.apple.audio.DriverHelper.xpc/Contents/MacOS/com.apple.audio.DriverHelper 326 1 /System/Library/Frameworks/Security.framework/Versions/A/XPCServices/com.apple.CodeSigningHelper.xpc/Contents/MacOS/com.apple.CodeSigningHelper 334 1 /usr/libexec/symptomsd 336 1 /usr/libexec/nsurlstoraged 355 1 /System/Library/PrivateFrameworks/AuthKit.framework/Versions/A/Support/akd 359 1 /System/Library/Frameworks/CryptoTokenKit.framework/ctkahp.bundle/Contents/MacOS/ctkahp -d 360 1 /usr/libexec/secinitd 362 1 /System/Library/PrivateFrameworks/PerformanceAnalysis.framework/Versions/A/XPCServices/com.apple.PerformanceAnalysis.animationperfd.xpc/Contents/MacOS/com.apple.PerformanceAnalysis.animationperfd 366 1 /System/Library/Frameworks/GSS.framework/Helpers/com.apple.GSSCred 367 1 /System/Library/CoreServices/AppleIDAuthAgent --checkpassword 368 1 sysmond 369 1 /System/Library/CoreServices/sharedfilelistd --enable-legacy-services 371 1 /System/Library/Frameworks/LocalAuthentication.framework/Support/coreauthd 373 1 /usr/libexec/securityd_service 374 1 /usr/sbin/cfprefsd agent 375 1 /usr/libexec/UserEventAgent (Aqua) 377 1 /usr/sbin/distnoted agent 379 1 /System/Library/Frameworks/CoreTelephony.framework/Support/CommCenter -L 380 1 /usr/libexec/lsd 381 1 /System/Library/CoreServices/Dock.app/Contents/MacOS/Dock 383 1 /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer 384 1 /usr/libexec/trustd --agent 385 1 /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder 388 1 /usr/libexec/secd 392 1 /usr/libexec/pboard 395 1 /System/Library/PrivateFrameworks/CloudDocsDaemon.framework/Versions/A/Support/bird 396 1 /System/Library/PrivateFrameworks/CacheDelete.framework/deleted 397 1 /usr/libexec/pkd 398 1 /System/Library/PrivateFrameworks/TelephonyUtilities.framework/callservicesd 400 1 /System/Library/Frameworks/Accounts.framework/Versions/A/Support/accountsd 401 1 /System/Library/PrivateFrameworks/IDS.framework/identityservicesd.app/Contents/MacOS/identityservicesd 402 1 /usr/libexec/AssetCache/AssetCache 404 1 /System/Library/CoreServices/backupd.bundle/Contents/Resources/TMCacheDelete 405 1 /System/Library/PrivateFrameworks/GeoServices.framework/geodMachServiceBridge 406 1 /System/Library/PrivateFrameworks/PackageKit.framework/Resources/installd 407 1 /System/Library/CoreServices/cloudphotosd.app/Contents/MacOS/cloudphotosd 408 1 /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Resources/storedownloadd 409 1 /System/Library/PrivateFrameworks/CoreSymbolication.framework/coresymbolicationd 410 1 /System/Library/PrivateFrameworks/PackageKit.framework/Resources/system_installd 411 1 /System/Library/PrivateFrameworks/QuickLookThumbnailing.framework/Support/com.apple.quicklook.ThumbnailsAgent 416 1 /usr/sbin/WirelessRadioManagerd 418 1 /usr/libexec/secinitd 419 1 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framework/Support/fontd 421 1 /System/Library/PrivateFrameworks/IMCore.framework/imagent.app/Contents/MacOS/imagent 424 1 /System/Library/PrivateFrameworks/TCC.framework/Resources/tccd 427 1 /System/Library/PrivateFrameworks/IMDPersistence.framework/XPCServices/IMDPersistenceAgent.xpc/Contents/MacOS/IMDPersistenceAgent 428 1 /System/Library/CoreServices/sharedfilelistd 429 1 /System/Library/PrivateFrameworks/UserActivity.framework/Agents/useractivityd 430 1 /System/Library/CoreServices/mapspushd 431 1 /System/Library/PrivateFrameworks/CalendarAgent.framework/Executables/CalendarAgent 433 1 /System/Library/Frameworks/AddressBook.framework/Executables/ContactsAccountsService 434 1 /usr/libexec/sharingd 435 1 /usr/sbin/usernoted 436 1 /System/Library/CoreServices/Dock.app/Contents/XPCServices/com.apple.dock.extra.xpc/Contents/MacOS/com.apple.dock.extra 438 1 /System/Library/PrivateFrameworks/MessagesKit.framework/Resources/soagent.app/Contents/MacOS/soagent 439 1 /System/Library/PrivateFrameworks/CalendarNotification.framework/Versions/A/XPCServices/CalNCService.xpc/Contents/MacOS/CalNCService 440 1 /usr/libexec/nsurlstoraged 442 1 /System/Library/PrivateFrameworks/AssistantServices.framework/assistantd 443 1 /System/Library/CoreServices/FolderActionsDispatcher.app/Contents/MacOS/FolderActionsDispatcher 445 1 /usr/libexec/spindump_agent 447 1 /System/Library/CoreServices/SocialPushAgent.app/Contents/MacOS/SocialPushAgent 451 1 /System/Library/CoreServices/NotificationCenter.app/Contents/MacOS/NotificationCenter 452 1 /System/Library/Frameworks/InputMethodKit.framework/Resources/imklaunchagent 453 1 /System/Library/CoreServices/Siri.app/Contents/MacOS/Siri launchd 455 1 /System/Library/Image Capture/Support/icdd 456 1 /System/Library/CoreServices/iconservicesagent 457 1 /System/Library/CoreServices/AppleIDAuthAgent 460 1 /System/Library/PrivateFrameworks/AskPermission.framework/Versions/A/Resources/askpermissiond 461 1 /System/Library/CoreServices/AirPlayUIAgent.app/Contents/MacOS/AirPlayUIAgent --launchd 462 1 /System/Library/CoreServices/cloudpaird 463 1 /System/Library/PrivateFrameworks/Noticeboard.framework/Versions/A/Resources/nbagent.app/Contents/MacOS/nbagent 465 1 /System/Library/CoreServices/WiFiAgent.app/Contents/MacOS/WiFiAgent 466 1 /System/Library/CoreServices/diagnostics_agent 467 1 /System/Library/PrivateFrameworks/PassKitCore.framework/passd 470 1 /System/Library/PrivateFrameworks/CloudPhotoServices.framework/Versions/A/Frameworks/CloudPhotosConfigurationXPC.framework/Versions/A/XPCServices/com.apple.CloudPhotosConfiguration.xpc/Contents/MacOS/com.apple.CloudPhotosConfiguration 472 1 /Applications/iTunes.app/Contents/MacOS/iTunesHelper.app/Contents/MacOS/iTunesHelper 473 1 /System/Library/PrivateFrameworks/CallHistory.framework/Support/CallHistoryPluginHelper 474 1 /Applications/Kies.app/Contents/MacOS/KiesAgent.app/Contents/MacOS/KiesAgent 475 1 /Users/mark/Library/Application Support/.FUS/fuspredownloader.app/Contents/MacOS/fuspredownloader 476 1 /usr/libexec/taskgated -s 478 1 /usr/libexec/keyboardservicesd 479 1 /usr/libexec/SafariCloudHistoryPushAgent 481 1 /System/Library/PrivateFrameworks/AuthKit.framework/Versions/A/Support/akd 482 1 /System/Library/PrivateFrameworks/CallHistory.framework/Support/CallHistorySyncHelper 483 1 /System/Library/PrivateFrameworks/GameCenterFoundation.framework/Versions/A/gamed 485 1 /usr/libexec/fmfd 486 1 /System/Library/PrivateFrameworks/CloudKitDaemon.framework/Support/cloudd 487 1 /System/Library/PrivateFrameworks/TCC.framework/Resources/tccd system 488 1 /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Resources/storeaccountd 489 1 /usr/libexec/nsurlsessiond 490 1 /usr/libexec/networkserviceproxy 492 1 /System/Library/Frameworks/Security.framework/Versions/A/Resources/CloudKeychainProxy.bundle/Contents/MacOS/CloudKeychainProxy 493 1 /System/Library/Frameworks/Security.framework/Versions/A/Resources/KeychainSyncingOverIDSProxy.bundle/Contents/MacOS/KeychainSyncingOverIDSProxy 497 1 /usr/sbin/filecoordinationd 498 1 /System/Library/CoreServices/Spotlight.app/Contents/MacOS/Spotlight 499 1 /System/Library/PrivateFrameworks/CoreParsec.framework/parsecd 500 1 /System/Library/Frameworks/CryptoTokenKit.framework/ctkahp.bundle/Contents/MacOS/ctkahp 501 1 /System/Library/Frameworks/LocalAuthentication.framework/Support/coreauthd 502 1 /System/Library/Frameworks/CryptoTokenKit.framework/ctkd -tw 503 1 /System/Library/PrivateFrameworks/GeoServices.framework/Versions/A/XPCServices/com.apple.geod.xpc/Contents/MacOS/com.apple.geod 505 1 /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Resources/storeassetd 506 1 /System/Library/PrivateFrameworks/CoreWLANKit.framework/Versions/A/XPCServices/WiFiProxy.xpc/Contents/MacOS/WiFiProxy 507 1 /System/Library/CoreServices/pbs 508 1 /System/Library/Input Methods/DictationIM.app/Contents/MacOS/DictationIM 509 1 /System/Library/CoreServices/NotificationCenter.app/Contents/XPCServices/com.apple.notificationcenterui.WeatherSummary.xpc/Contents/MacOS/com.apple.notificationcenterui.WeatherSummary 510 1 /System/Library/Input Methods/PressAndHold.app/Contents/PlugIns/PAH_Extension.appex/Contents/MacOS/PAH_Extension 511 1 /System/Library/CoreServices/Menu Extras/TextInput.menu/Contents/SharedSupport/TISwitcher.app/Contents/MacOS/TISwitcher 513 1 /System/Library/PrivateFrameworks/PhotoLibraryPrivate.framework/Versions/A/Support/photolibraryd 515 1 /usr/libexec/videosubscriptionsd 525 1 /System/Library/PrivateFrameworks/MediaRemote.framework/Support/mediaremoteagent 526 1 /System/Library/PrivateFrameworks/ViewBridge.framework/Versions/A/XPCServices/ViewBridgeAuxiliary.xpc/Contents/MacOS/ViewBridgeAuxiliary 527 1 /usr/libexec/captiveagent 530 1 /System/Library/PrivateFrameworks/CloudDocsDaemon.framework/XPCServices/ContainerMetadataExtractor.xpc/Contents/MacOS/ContainerMetadataExtractor 531 1 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1 /System/Library/PrivateFrameworks/IMFoundation.framework/XPCServices/IMRemoteURLConnectionAgent.xpc/Contents/MacOS/IMRemoteURLConnectionAgent 545 1 /Library/Frameworks/iTunesLibrary.framework/Versions/A/XPCServices/com.apple.iTunesLibraryService.xpc/Contents/MacOS/com.apple.iTunesLibraryService 548 1 /System/Library/PrivateFrameworks/CommunicationsFilter.framework/CMFSyncAgent.app/Contents/MacOS/CMFSyncAgent 549 1 /usr/libexec/watchdogd 550 1 /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/XPCServices/com.apple.CommerceKit.TransactionService.xpc/Contents/MacOS/com.apple.CommerceKit.TransactionService 551 1 /System/Library/PrivateFrameworks/ContactsAgent.framework/Executables/ContactsAgent 552 1 /Applications/Google Chrome.app/Contents/MacOS/Google Chrome 553 1 /usr/libexec/gamecontrollerd 555 1 /Applications/Google Chrome.app/Contents/Versions/59.0.3071.115/Google Chrome Framework.framework/Helpers/crashpad_handler --monitor-self-annotation=ptype=crashpad-handler 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--content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,34037;0,11,34037;0,12,34037;0,13,3553;0,14,3553;0,15,3553;0,16,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,34037;1,11,34037;1,12,34037;1,13,3553;1,14,3553;1,15,3553;1,16,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,34037;2,11,34037;2,12,34037;2,13,3553;2,14,3553;2,15,3553;2,16,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,34037;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,34037;3,13,34037;3,14,3553;3,15,34037;3,16,34037;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,34037;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,34037;4,13,34037;4,14,3553;4,15,34037;4,16,34037 --service-request-channel-token=2A07525A75801256DC5809D645FC335A --renderer-client-id=182 1162 1 /System/Library/PrivateFrameworks/ProtectedCloudStorage.framework/Helpers/ProtectedCloudKeySyncing 1163 1 /System/Library/CoreServices/EscrowSecurityAlert.app/Contents/MacOS/EscrowSecurityAlert 1164 1 /System/Library/PrivateFrameworks/CloudServices.framework/Versions/A/XPCServices/com.apple.sbd.xpc/Contents/MacOS/com.apple.sbd 1166 1 /System/Library/PrivateFrameworks/CoreCDP.framework/Versions/A/Resources/cdpd 1198 552 /Applications/Google Chrome.app/Contents/Versions/59.0.3071.115/Google Chrome Helper.app/Contents/MacOS/Google Chrome Helper --type=renderer --field-trial-handle=1 --primordial-pipe-token=F0AB9A08CC2C13DA86C6EFA024283EB8 --lang=en-US --enable-offline-auto-reload --enable-offline-auto-reload-visible-only --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false,disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections=false --enable-pinch --num-raster-threads=4 --enable-zero-copy --enable-gpu-memory-buffer-compositor-resources --enable-main-frame-before-activation --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,34037;0,11,34037;0,12,34037;0,13,3553;0,14,3553;0,15,3553;0,16,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,34037;1,11,34037;1,12,34037;1,13,3553;1,14,3553;1,15,3553;1,16,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,34037;2,11,34037;2,12,34037;2,13,3553;2,14,3553;2,15,3553;2,16,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,34037;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,34037;3,13,34037;3,14,3553;3,15,34037;3,16,34037;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,34037;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,34037;4,13,34037;4,14,3553;4,15,34037;4,16,34037 --service-request-channel-token=F0AB9A08CC2C13DA86C6EFA024283EB8 --renderer-client-id=224 1290 552 /Applications/Google Chrome.app/Contents/Versions/59.0.3071.115/Google Chrome Helper.app/Contents/MacOS/Google Chrome Helper --type=renderer --field-trial-handle=1 --primordial-pipe-token=B9128D33092223B1F39D92FED13A7085 --lang=en-US --enable-offline-auto-reload --enable-offline-auto-reload-visible-only --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false,disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections=false --enable-pinch --num-raster-threads=4 --enable-zero-copy --enable-gpu-memory-buffer-compositor-resources --enable-main-frame-before-activation --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,34037;0,11,34037;0,12,34037;0,13,3553;0,14,3553;0,15,3553;0,16,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,34037;1,11,34037;1,12,34037;1,13,3553;1,14,3553;1,15,3553;1,16,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,34037;2,11,34037;2,12,34037;2,13,3553;2,14,3553;2,15,3553;2,16,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,34037;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,34037;3,13,34037;3,14,3553;3,15,34037;3,16,34037;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,34037;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,34037;4,13,34037;4,14,3553;4,15,34037;4,16,34037 --service-request-channel-token=B9128D33092223B1F39D92FED13A7085 --renderer-client-id=256 1311 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker -s mdworker -c MDSImporterWorker -m com.apple.mdworker.shared 1313 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker -s mdworker -c MDSImporterWorker -m com.apple.mdworker.shared 1316 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker -s mdworker -c MDSImporterWorker -m com.apple.mdworker.shared 1319 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker -s mdworker -c MDSImporterWorker -m com.apple.mdworker.shared 1324 1 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker -s mdworker -c MDSImporterWorker -m com.apple.mdworker.shared 1327 1 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 50669 1328 1 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 50669 1329 1 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 50669 1331 941 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 51632 1332 1331 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 51632 1333 1331 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 51632 1334 1331 /Library/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python -c __import__('idlelib.run').run.main(True) 51632 1506 1 /System/Library/Frameworks/QuickLook.framework/Resources/quicklookd.app/Contents/MacOS/quicklookd 1520 552 /Applications/Google Chrome.app/Contents/Versions/59.0.3071.115/Google Chrome Helper.app/Contents/MacOS/Google Chrome Helper --type=renderer --field-trial-handle=1 --primordial-pipe-token=666D4A95D5DF61DAF4FB6F9EF29AC91B --lang=en-US --enable-offline-auto-reload --enable-offline-auto-reload-visible-only --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false,disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections=false --enable-pinch --num-raster-threads=4 --enable-zero-copy --enable-gpu-memory-buffer-compositor-resources --enable-main-frame-before-activation --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,34037;0,11,34037;0,12,34037;0,13,3553;0,14,3553;0,15,3553;0,16,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,34037;1,11,34037;1,12,34037;1,13,3553;1,14,3553;1,15,3553;1,16,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,34037;2,11,34037;2,12,34037;2,13,3553;2,14,3553;2,15,3553;2,16,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,34037;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,34037;3,13,34037;3,14,3553;3,15,34037;3,16,34037;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,34037;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,34037;4,13,34037;4,14,3553;4,15,34037;4,16,34037 --service-request-channel-token=666D4A95D5DF61DAF4FB6F9EF29AC91B --renderer-client-id=311 1569 552 /Applications/Google Chrome.app/Contents/Versions/59.0.3071.115/Google Chrome Helper.app/Contents/MacOS/Google Chrome Helper --type=renderer --field-trial-handle=1 --primordial-pipe-token=A64A66AB5AA57FD7494CEC86339B3CE9 --lang=en-US --enable-offline-auto-reload --enable-offline-auto-reload-visible-only --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false,disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections=false --enable-pinch --num-raster-threads=4 --enable-zero-copy --enable-gpu-memory-buffer-compositor-resources --enable-main-frame-before-activation --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,34037;0,11,34037;0,12,34037;0,13,3553;0,14,3553;0,15,3553;0,16,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,34037;1,11,34037;1,12,34037;1,13,3553;1,14,3553;1,15,3553;1,16,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,34037;2,11,34037;2,12,34037;2,13,3553;2,14,3553;2,15,3553;2,16,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,34037;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,34037;3,13,34037;3,14,3553;3,15,34037;3,16,34037;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,34037;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,34037;4,13,34037;4,14,3553;4,15,34037;4,16,34037 --service-request-channel-token=A64A66AB5AA57FD7494CEC86339B3CE9 --renderer-client-id=326 1574 1 /System/Library/Frameworks/Foundation.framework/Versions/C/XPCServices/LookupViewService.xpc/Contents/MacOS/LookupViewService 1576 1 /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/XPCServices/com.apple.DictionaryServiceHelper.xpc/Contents/MacOS/com.apple.DictionaryServiceHelper 1577 1 /usr/libexec/DataDetectorsSourceAccess 1582 552 /Applications/Google Chrome.app/Contents/Versions/59.0.3071.115/Google Chrome Helper.app/Contents/MacOS/Google Chrome Helper --type=renderer --field-trial-handle=1 --primordial-pipe-token=3B82321FAECB1EE2699F455F06F1ABC0 --lang=en-US --enable-offline-auto-reload --enable-offline-auto-reload-visible-only --blink-settings=disallowFetchForDocWrittenScriptsInMainFrame=false,disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections=false --enable-pinch --num-raster-threads=4 --enable-zero-copy --enable-gpu-memory-buffer-compositor-resources --enable-main-frame-before-activation --content-image-texture-target=0,0,3553;0,1,3553;0,2,3553;0,3,3553;0,4,3553;0,5,3553;0,6,3553;0,7,3553;0,8,3553;0,9,3553;0,10,34037;0,11,34037;0,12,34037;0,13,3553;0,14,3553;0,15,3553;0,16,3553;1,0,3553;1,1,3553;1,2,3553;1,3,3553;1,4,3553;1,5,3553;1,6,3553;1,7,3553;1,8,3553;1,9,3553;1,10,34037;1,11,34037;1,12,34037;1,13,3553;1,14,3553;1,15,3553;1,16,3553;2,0,3553;2,1,3553;2,2,3553;2,3,3553;2,4,3553;2,5,3553;2,6,3553;2,7,3553;2,8,3553;2,9,3553;2,10,34037;2,11,34037;2,12,34037;2,13,3553;2,14,3553;2,15,3553;2,16,3553;3,0,3553;3,1,3553;3,2,3553;3,3,3553;3,4,3553;3,5,34037;3,6,3553;3,7,3553;3,8,3553;3,9,3553;3,10,3553;3,11,3553;3,12,34037;3,13,34037;3,14,3553;3,15,34037;3,16,34037;4,0,3553;4,1,3553;4,2,3553;4,3,3553;4,4,3553;4,5,34037;4,6,3553;4,7,3553;4,8,3553;4,9,3553;4,10,3553;4,11,3553;4,12,34037;4,13,34037;4,14,3553;4,15,34037;4,16,34037 --service-request-channel-token=3B82321FAECB1EE2699F455F06F1ABC0 --renderer-client-id=333 1302 652 login -pf mark 1303 1302 -bash 1310 1303 ssh meretzkm@oit2.scps.nyu.edu 1082 652 login -pf mark 1083 1082 -bash 1584 1083 ps -A -o pid ppid command
Each line of text read from the child process
ps
is stored in an object of class
Process
in
lines 50–55.
And before we do that,
we store one special process (the one whose PID is 0)
in an object of class
Process
in
line
48.
Lines
13–15
show the three attributes that each
Process
object contains.
When a
Process
is born,
lines
17–19
find its parent process,
and append the newborn process to the list of its parent’s children.
Of course,
the process at the top of the tree (PID 0) has no parent,
so we make no attempt to find its parent
(line
16).
Line
17
calls the recursive function in
line
21
to find the parent
Process
of a newborn
Process
.
The search begins at the
root
Process
in
line
17,
at the top of the tree.
In other words,
when
line
21
is first executed,
the
self
in that line is
root
.
Line
24
checks if
root
itself is the parent of the newborn
Process
.
If not,
the
for
loop in
lines
26–29
check if the parent of the newborn
Process
is among the chidren of
root
and their descendants.
If not,
line
30
returns
None
.
Each PID is a 32-bit integer,
so it takes up to five digits to print
(line
35)
That’s why we indent the children of each
Process
an additional five spaces
(line
37).
When all the input has been read in and stored in the tree,
line
57
prints the whole tree
starting at the
root
,
just as
line
17
searched the whole tree starting at the
root
.
Line
35
prints the
root
Process
,
and the
the
for
loop in
lines
36–37
prints the children of
root
and their descendants.
Note that the recursive functions
find
in
line
21
and
print
in
line
32
have the same structure:
first they process
self
,
and then they call themselves to process the children of
self
and their descendants.
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