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  1. Introduction

    Files and File Structure

  2. File Structure
  3. Configuration Files
  4. File Formats

    Commands

  5. Filesystem Management
  6. File Management and Viewing
  7. Help, Job and Process Management
  8. Network Management
  9. System Management
  10. User Management
  11. Printing and Programming
  12. Document Preparation
  13. Miscellaneous
  14. Credits

Linux Job Management, Process Management, and Help

Linux Help Commands

aproposapropos keyword - Show all commands with the keyword in their description. The same as the "man -k" command.
helpBash shell help for the bash builtin command list. The help command gets help for a particular command.
manGet help from the manual for a command.
manman -k keyword - Show all commands with the keyword in their description
"man 2 kill" - Display page 2 of the kill command
manpathDetermine user's searchpath for manpages.
infoDocumentation on Linux commands and programs similar to the man pages but navigation is organized different.

Linux Job Management

atSimilar to cron but run only once.
atqLists the user's pending jobs. If the user is the superuser, everybody's jobs are listed.
atrmDeletes at jobs.
atrunRun jobs queued for later execution
batchExecutes commands when system load levels drop below 0.8 or value specified in atrun invocation.
cronA deamon used to set commands to be run at specific times. Starts the commands in the crontab file. Used to clean up temporary files periodically in the /var/tmp and /tmp directories.
niceRun a program with modified scheduling priority.
nohupRun a command immune to hangups, with output to a non-tty.
watchExecute a program periodically showing output full screen.

Linux Process management

bgStarts a suspended process in the background
fg Starts a suspended process in the foreground
gitpsA graphical process viewer and killer program.
jobsLists the jobs running
killEx: "kill 34" - Effect: Kill or stop the process with the process ID number 34.
killallKill processes by name. Can check for and restart processes.
pidofFind the process ID of a running program
psGet the status of one or more processes. Options:
  • u (more info)
  • a (see all)
  • -l (technical info)
Meanings:
  • PPID-parent process ID
  • PID-process ID
ps ax |more to see all processes including daemons
pstreeDisplay the tree of running processes.
saGenerates a summary of information about users' processes that are stored in the /var/log/pacct file.
skillReport process status.
sniceReport process status.
topDisplay the processes that are using the most CPU resources.
CTRL-CKills the current job.
& At the end of the command makes it run in the background.