Some Useful Linux Commands

I can't declare myself as linux user since I didn't use linux as my main operating system on my computers. But I do use linux when needed. Since then, I always forget the commands when I didn't touch linux for years. Now I'm working on with linux again and I have to recall all the commands back again. So, to make my future search for useful commands more quickly, I compiled my linux commands here.

ls - list file or directory
Example Usage:

root@OpenWrt:/# ls
bin   dev   etc   jffs  lib   mnt   proc  rom   sbin  tmp   usr   var   www
root@OpenWrt:/#

cd - change directory
Example usage:

root@OpenWrt:~# cd /jffs
root@OpenWrt:/jffs#

cat - view text in a file
Example usage:

root@OpenWrt:/etc# cat banner
  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 WHITE RUSSIAN (0.9) -------------------------------
  * 2 oz Vodka   Mix the Vodka and Kahlua together
  * 1 oz Kahlua  over ice, then float the cream or
  * 1/2oz cream  milk on the top.
 ---------------------------------------------------
root@OpenWrt:/etc#

echo - echo a strings

root@OpenWrt:/# echo 'this is the first line
> and second line
> the third
> and then fourth' > mytextfile
root@OpenWrt:/# cat mytextfile
this is the first line
and second line
the third
and then fourth
root@OpenWrt:/#

insmod - install a kernel module

root@OpenWrt:/# insmod mmc
Using /lib/modules/2.4.30/mmc.o
root@OpenWrt:/#

lsmod - list of installed kernel module

root@OpenWrt:/# lsmod
Module                  Size  Used by    Tainted: P
mmc                    26604   0 (unused)
wlcompat               15744   0 (unused)
ip_nat_irc              2336   0 (unused)
ip_conntrack_irc        3128   1
ip_nat_tftp             1824   0 (unused)
ip_conntrack_tftp       1728   1
ip_nat_ftp              2960   0 (unused)
ip_conntrack_ftp        4320   1
wl                    423640   0 (unused)
switch-robo             4460   0 (unused)
switch-core             4912   0 [switch-robo]
diag                   19808   0 (unused)
root@OpenWrt:/#

rmmod - uninstall a kernel module

root@OpenWrt:/# rmmod mmc
root@OpenWrt:/#

Umm... maybe enough for today coz I have things to do now. I'll update this post later...