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Table of Contents

Current Commands

List

Command Description
General
pwd print the current path
which <program> print the path of the <program>
Kernel modules
lsmod list modules
insmod nvidia / modprobe nvidia insert the module (modprobe higher level)
rmmod nvidia / modprobe -r nvidia remove the module (modprobe higher level)
Boot scripts (Gentoo)
rc-update show list boot scripts
rc-update add script.sh boot add the script to the boot level
Manage users
adduser -m -s /bin/zsh -g users cyril add user cyril, ask creation of his home folder (-m), shell (-s), groups (-g)
passwd cyril change the password of user cyril (or yours if no user specified)
groupadd <group> add a group to the system
/etc/passwd contains UID of users, home directory and shell used
/etc/shadow contains crypted passwords of users
/etc/group contains groups GIDs and list of users in (you can edit it to add users to groups)
userdel delete user
groupdel delete group
Manage permissions
chmod -R [u/g/o/a][+/-/=][r/w/x] <file(s)/folder(s)> change permissions (user,group,other,all)
chmod -R 0222 change permissions (octal : rwx=1+2+4 / ugo)
chown -R <owner>:<group> <file(s)/folder(s)> change owner and group
Monitoring
top / htop / ps / free processes (cpu, mem)
nettop / jnettop network
lsof opened files
w connected users
pidstat
atop
System
lspci
lsusb
lshw
File content manipulation
cat file | grep <string> only print lines containing string (-e for regexp)
grep -r <string> * search recursively the string in all files
cat <file> | cut -d “ ” -f 1,2,4-10 only prints the given fields (-f), obtained with the given delimiter (-d), or the complement (–complement)
cat <file> | sed 's/string1/string2/g replace string1 by string2 (and a lot more with sed)
perl -pi -e “s/string1/string2/g” <files> replace string1 by string2 in all files (and a lot more with perl)
cat <file> | tr '[:lower:]' '[:upper:]' convert lowercase to uppercase (and a lot more with tr)
cat <file> | wc -l count number of lines (and a lot more with wc)
iconv -f iso-8859-15 -t utf8 <file> convert file content from encoding latin9 to utf8 (see also recode)
convmv -f iso-8859-15 -t utf8 -r <folder> convert file names of files in folder from encoding latin9 to utf8
linux/commands.1227824669.txt.gz · Last modified: 2013/09/19 16:42 (external edit)
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