My RHEL Notes
general notes
$ cmd [-opt] [arguments]
cmd uses $PATH and arguments uses $PWD. Arguments are local to current working directory
Press TAB TAB to list available commands in $PATH or list available arguments in $PWD.
managing system resources
Ctrl+Z jobs fg %[job #] ps [-fax]
Process Status can be suspended (S+PROCESS STATE CODES in $ ps man page to view), stopped (T), running (R+), zombie
running process is flagged to be scheduled in CPU cycles
- ps -ax
Command column square brackets [ ] mean kernel started process.
kill -l // list kill options
process priority
- nice cmd
- renice cmd
- jobs // to get job #
kill -KILL %[job #] // to kill by job #
disk usage
use du command
- du -sh /* 2> /dev/null // use STD ERROR to bit bucket
- ps -eo "%c %n %y" // see ps man page, like %P & %U
Software Management
- rpm -qf
- rpm -ql
- rpm -V
- rpm -vi
- rpm -qa
yum resolves dependencies
rpm installs & deletes
- ls /etc/yum.repos.d/
man pages
$ man -k record | grep -i dvd
- man -k pdf
network stuff
- mtr [destination]
users & groups
- egrep 'dave|darth|luke' /etc/{passwd,group,shadow}
pending categorization
- ldd /usr/bin/sshd