1. man - an interface to the on-line reference manuals
$man man
2. apt - advanced package tool
SEE ALSO: apt-cache, apt-get, apt.conf, sources.list
$apt-cache search mysql
3.sudo - execute a command as another user (sudo allows a permitted user to execute a command as the superuser or another user, as specified by the security policy.)
$sudo apt-get install python2.
4.su - change user ID or become superuser
cc@debian:~$su
Password:
root@debian:/home/cc#su -- cc
cc@debian:~$
5. ls - list directory contents
$ls -l
$ls -la
6. pwd - print name of current/working directory
$pwd
7. mkdir - make directories
$mkdir test1
8. mv - move (rename) files
$mv test1 test2
9.rm - remove files or directories
$rm -fr test2
10.more, less - file perusal filter for crt viewing (a filter for paging through text one screenful at a time.)
$man more|less
note: '|' is pipeline, see more on wiki about pipeline
11.grep - grep, egrep, fgrep, rgrep - print lines matching a pattern
$ls -la|grep django-web
12.chown - change file owner and group
#chown root /u
#chown root:staff /u
13.chmod - change file mod bits
#mkdir /data
#chmod /data