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

1. ps -ax

Command column square brackets [ ] mean kernel started process.

kill -l // list kill options

process priority

1. nice cmd
2. renice cmd

1. jobs // to get job #

kill -KILL %[job #] // to kill by job #

disk usage

use du command

1. du -sh /* 2> /dev/null // use STD ERROR to bit bucket

1. 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

1. man -k pdf

network stuff

1. mtr [destination]

users & groups

1. egrep 'dave|darth|luke' /etc/{passwd,group,shadow}

pending categorization

1. ldd /usr/bin/sshd

To Linux