Job Management in Linux
From Free Knowledge Base- The DUCK Project: information for everyone
Linux Job Management, Process Management, and Help from: CTDP Linux Files and Command Reference Version 0.8.0) by Mark Allen
Contents
Linux Help Commands
apropos
- apropos keyword - Show all commands with the keyword in their description. The same as the "man -k" command.
help
- Bash shell help for the bash builtin command list. The help command gets help for a particular command.
man
- Get help from the manual for a command.
man
- man -k keyword - Show all commands with the keyword in their description
- "man 2 kill" - Display page 2 of the kill command
manpath
- Determine user's searchpath for manpages.
info
- Documentation on Linux commands and programs similar to the man pages but navigation is organized different.
Linux Job Management
at
- Similar to cron but run only once.
atq
- Lists the user's pending jobs. If the user is the superuser, everybody's jobs are listed.
atrm
- Deletes at jobs.
atrun
- Run jobs queued for later execution
batch
- Executes commands when system load levels drop below 0.8 or value specified in atrun invocation.
cron
- A 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.
nice
- Run a program with modified scheduling priority.
nohup
- Run a command immune to hangups, with output to a non-tty.
watch
- Execute a program periodically showing output full screen.
Linux Process management
bg
- Starts a suspended process in the background
fg
- Starts a suspended process in the foreground
gitps
- A graphical process viewer and killer program.
jobs
- Lists the jobs running
kill
- Ex: "kill 34" - Effect: Kill or stop the process with the process ID number 34.
killall
- Kill processes by name. Can check for and restart processes.
pidof
- Find the process ID of a running program
ps
- Get 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
pstree
- Display the tree of running processes.
sa
- Generates a summary of information about users' processes that are stored in the /var/log/pacct file.
skill
- Report process status.
snice
- Report process status.
top
- Display the processes that are using the most CPU resources.
CTRL-C
- Kills the current job.
&
- At the end of the command makes it run in the background.
