Difference between revisions of "Basic Commands"
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= hostname = | |||
Shows the current hostname.</br> | |||
<code>-f</code> show FQDN | |||
<code>hostnamectl status</code> (default) show current system hostname and related information.</br> | |||
<code>hostnamectl set-hostname</code> set and apply a new hostname</br> | |||
= last = | |||
Show a list of last logged in users and system boots.</br> | |||
Can be refined with a username/keyword.</br> | |||
= lastb = | |||
Show a list of last failed login attempts.</br> | |||
Can be refined with a username/keyword.</br> | |||
= ls = | = ls = | ||
<code>-a</code> do not ignore entries starting with .</br> | <code>-a</code> do not ignore entries starting with .</br> | ||
| Line 29: | Line 44: | ||
<code>-R</code> apply recursive</br> | <code>-R</code> apply recursive</br> | ||
<code>-x</code> remove access acl</br> | <code>-x</code> remove access acl</br> | ||
= w = | |||
Display current system information.</br> | |||
= watch = | = watch = | ||
| Line 45: | Line 63: | ||
= which = | = which = | ||
Locate a command.</br> | Locate a command.</br> | ||
= who = | |||
Display currently logged in users.</br> | |||
Revision as of 10:28, 30 December 2022
hostname
Shows the current hostname.
-f show FQDN
hostnamectl status (default) show current system hostname and related information.
hostnamectl set-hostname set and apply a new hostname
last
Show a list of last logged in users and system boots.
Can be refined with a username/keyword.
lastb
Show a list of last failed login attempts.
Can be refined with a username/keyword.
ls
-a do not ignore entries starting with .
-F append a symbol to indicate type (* executable, / directory, @ symlink, = socket, | named pipe, > door)
-h (with -l and -s) print sizes like 1K 234M 5G
-i display inode number
-l use a long listing format
-r reverse order while sorting
-s display size
-t sort by time, newest first
less & more
space / f scroll forward one screen
enter scroll forward one line
b scroll backward one screen
d scroll forward half a screen
h display help
q quit
/string search string forward
?string search string backward
n find next occurrence
N find previous occurrence (less only)
setfacl
-b remove all access acls
-d apply default acl
-k remove all default acls
-m set or modify acls
-n prevent automatic recalculation of mask
-R apply recursive
-x remove access acl
w
Display current system information.
watch
Execute a command every X seconds (default 2).
watch -n X who execute the who command every X seconds
wc
Display lines (-l), words (-w), bytes (-c) or characters (-m) of file.
whatis
Display one-line man page description of a command.
whereis
Locate the binary, source and man pages for a command.
which
Locate a command.
who
Display currently logged in users.