cd / : entry root directory
-----------------------
[email protected]:/etc$ cd /
[email protected]:/$ pwd
cd ~ : entry user root directory
----------------------
[email protected]:/$ cd ~
[email protected]:~$ pwd
/home/tangym
ls : list all files.
pwd : show current directory
cd /home : entry home directory
cd .. : entry the last parent directory
cat fstab: show the text file content.
cat fs， then press <Tab>. Shell will fill the whole file name automtically.
ls m* : list all the file name starts with: m
ls magi? : list all the file name starts with : magi and following one character.
Like: magic
ls m*[od] : list all starts with : m, end with: o or d.
ls -l : show all file‘s properties:
-------------------------
[email protected]:~$ ls -l
total 204112
drwxr-xr-x 2 tangym tangym 4096 May 29 2015 Desktop
drwxr-xr-x 2 tangym tangym 4096 May 29 2015 Documents
drwxr-xr-x 3 tangym tangym 4096 May 14 08:53 Downloads
-rw-r--r-- 1 tangym tangym 8445 May 29 2015 examples.desktop
-rw-rw-r-- 1 tangym tangym 10240 Jan 20 2011 ez_setup.py
drwxr-xr-x 2 tangym tangym 4096 May 29 2015 Music
drwxr-xr-x 2 tangym tangym 4096 May 29 2015 Pictures
drwxr-xr-x 2 tangym tangym 4096 May 29 2015 Public
dir : show all files
vdir: show all files and its properties
cat -n .bashrc: show file content with rowcount
---------------------------
[email protected]:~$ cat -n .bashrc
1 # ~/.bashrc: executed by bash(1) for non-login shells.
2 # see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
3 # for examples
4
more .bashrc : show file content in separate page.
----------------
[email protected]:~$ more .bashrc
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples
head -n 5 .bashrc : show first 5 row content
tail -n 5 .bashrc : show last 5 row content.
grep PS1 .bashrc : find all row content with: PS1
------------------------
[email protected]:~$ grep PS1 .bashrc
[ -z "$PS1" ] && return
PS1=‘${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\[email protected]\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ ‘
PS1=‘${debian_chroot:+($debian_chroot)}\[email protected]\h:\w\$ ‘
PS1="\[\e]0;${debian_chroot:+($debian_chro
find ./ -name *bash* : Find file name with: bash in current directory.
-----------------------------
[email protected]:~$ find ./ -name *bash*
./.bash_history
./.bashrc
./.bash_logout
./redis-py-master/vagrant/.bash_profile
./Downloads/redis-py-master/vagrant/.bash_profile
[email protected]:~$ locate bash // similar to find . find file/directory with :back
[email protected]:~$ sudo updatedb //force update local db for Locate command
[email protected]:~$ firefox www.baidu.com : open firefox webbrowser
whereis find : get command‘s notebook
-------------------------------
[email protected]:~$ whereis find : get notebook
find: /usr/bin/find /usr/bin/X11/find /usr/share/man/man1/find.1.gz
[email protected]:~$ whereis -b find
---------------get executable program
find: /usr/bin/find /usr/bin/X11/find
-------------------------------
which ls: find where is ls command
------------------------------
[email protected]:~$ which ls
/bin/ls
-----------------------------
who
whoami
uname
uname -a
uname -r : kernel version
----------------------------
[email protected]:~$ who
tangym tty7 2016-05-23 23:50
tangym pts/1 2016-05-23 23:50 (:0)
tangym pts/2 2016-05-23 23:58 (:0)
tangym pts/3 2016-05-23 23:59 (:0)
tangym pts/4 2016-05-24 19:49 (:0)
[email protected]:~$ who am i
tangym pts/4 2016-05-24 19:49 (:0)
[email protected]:~$ whoami
tangym
[email protected]:~$ uname
Linux
[email protected]:~$ uname -a
Linux ubuntu 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
-------------------------------
man find : get the find command decription
-------------------------------
[email protected]:~$ man find
--------------------------------
whatis ls: get the command common usage.
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[email protected]:~$ whatis ls
ls (1) - list directory contents
-------------------------------