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Linux Job Management, Process Management, and Help
(from: CTDP Linux Files and Command Reference Version 0.8.0)
by Mark Allen
[ 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.
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