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--- linux:commands [2006/12/15 12:51]
cyril created
+++ linux:commands [2024/04/19 13:59] (current)
cyril [List]
@@ Line 1: / Line 1: @@
-====== Current Commands ======
+====== Usual Commands ======
+===== Links =====
+User management :\\
+[FR] [[http://www.labo-linux.org/cours/module-1/chapitre-05-gestion-des-utilisateurs/]]
+===== List =====
 ^  Command  ^  Description  ^
+^  General  ^^
+| pwd | print the current path |
+| which <program> | print the path of the <program> |
+| write <user> | write messages with a user connected on the same machine |
 ^  Kernel modules  ^^
-| lsmod | |
+| lsmod | list modules |
-| rmmod | |
+| insmod nvidia / modprobe nvidia | insert the module (modprobe higher level) |
-^  Boot scripts  ^^
+| rmmod nvidia / modprobe -r nvidia | remove the module (modprobe higher level) |
-| rc-update | |
+^  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 <primary-group> <user> | add user, ask creation of his home folder (-m), shell (-s), primary group (-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 |
+| usermod -a -G <group> <user> | add an exisiting user to an existing group |
+| chsh -s /bin/zsh | change default shell of user |
+| userdel | delete user |
+| groupdel | delete group |
+^  Manage permissions  ^^
+| chmod -R [u/g/o/a][+/-/=][r/w/x/X][,...] <file(s)/folder(s)> | change permissions (user,group,other,all ; read,write,execute,execute clone) |
+| chmod -R 0222 | change permissions (octal : rwx=1+2+4 / ugo) |
+| chown -R <owner>:<group> <file(s)/folder(s)> | change owner and group |
+| chgrp -R <group> <file(s)/folder(s)> | only change 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 | head -n 2'' ,   ''cat file | tail -n 2'' |   |
+| ''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) |
+| ''sed -i 's/string1/string2/g <files>'' | replace string1 by string2 in all files |
+| ''echo "Image 10:55.jpg" | sed 's/([0-9]{2}).jpg/\1 #1.jpg/' '' | example with more complex regex |
+| ''perl -pi -e "s/string1/string2/g" <files>'' | replace string1 by string2 in all files (and a lot more with perl) |
+| ''awk 'NR>10 && NR<1000 {print $#}' <file-in>'' | extract lines 10 to 1000 from file-in to file-out |
+| ''awk '{ print "[10]("$1","$4","$5","$6")" }' <file-in>'' | reorganize and reformat columns of a file |
+| ''awk 'NR==1 { t=$1 } NR>1 { dt=t-$1; t=$1; print dt; }' <file-in>'' | output the difference between two consecutive lines |
+| ''cat <file> | tr '[:lower:]' '[:upper:]' '' | convert lowercase to uppercase (and a lot more with tr) |
+| ''date +"%Y/%m/%d %H:%M:%S" | tr '\012' ' ' >> log.log'' | write date in a file without the last line return |
+| ''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 |
+| paste | merge files by concatenating columns |
+| numfmt --to=iec --format="%.2f" | to convert numbers to and from human-readable format |
+^  Programming  ^^
+| nm [-D] / objdump / ldd / readelf [-s] | check infos about link and symbols in exe and libs |
+| strace | list system calls a program issues |
+tr '\012' ' '