Interesting Linux Commands

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Interesting Linux Commands

Post  cyberhunter on Sun May 25, 2008 10:01 pm

This post is not originated by me and i copied it from
is written by
-z3r0phr34k (Stan)

Interesting UNIX Commands

(yes, i know some of these are kinda out of date but i wrote them down back
when i first started playing with linux. Pluss i like the way it looks doing
stuff from the terminal so most of these can be done from the GUI but i like
doing it thisway.)

Ever since renting a UNIX handbook a while back ive discovered lots of the more
complex operations and commands of UNIX, besides the mundane, and ordinary
asks of running an maintaining an eggdrop. I therefore went through my UNIX
Handbook picking out some of the less mentioned, useful comands, and here
they are:

mailx - This program will send an email to someone just like that. The syntax
is 'mailx user@host' you then enter your message.

mesg - This command is used to disable or enable the ability of users being
able to 'write' to you.

uname - This basically returns the version of UNIX the box is running. There
are various switches for this command.

wall - Sends a public message to ever user on the box, as if you had 'writen'
to each and ever user. Good for admins.

banner - This reutrns an ASCII banner for a word or letter you specify. So
'banner shell' would outpub shell in big ASCII

uncompress - This decompresses .Z files. For example 'uncompress shell.Z'
would output a file 'shell'

tail - This shows the last 10 lines of a file. The -f option can also be
used to 'follow' a file as additions are made.

more - allows you to scroll a file. This is most often used when reading
MOTDs, by 'more /etc/motd'

ln - This is used to create links. For instance I could make shell-tests.txt
link to a file called tests by 'ln -s shell-tests.txt tests'

grep - This command is the equivilent of find. I use it a lot, when doing
tasks and adding the pipe symbol. Like 'ps aux | grep -c eggdrop' This
basically takes ps aux, and searches it for the amount of times eggdrop is
mentioned (hence -c for count)

crypt - This is used to encrypt text with a password. Simple encryption, but
easy to use, if you need to encrypt somthin.

chown - This changes ownership of files or directories to a group or user.
Very useful for administration tasks.

cat - This is the equivilent of type in DOS. All it does is prints out
(on your screen) the contents of a file.

su - This is usually associated with Super User'ing to root, however it
can also be used to login with a different login name. Use su <username>.
It will then prompt you for the pass of that user.

sleep - This command is like pause, however you need to specify a time in
seconds. This is usually used in scripts.

ruptime - This neat command lists all the boxes on the LAN, their uptime,
status, load averages and amount of users.

nohup - This command is a simple equivilent of screen. It basically keeps a
process alive even when you're logged out.

man - This stands for manual, and covers most topics. To use it try
'man' it should give you help Smile

groups - Returns with the groups that you're a member of.

env - This command sets the environment of your shell. For instance you can
change your home dir with 'env HOME=/home/blah'

at - This can be used to schedule things. Use 'at 10am' <enter> and then
enter the command you'd like it to perform at that time.

stty - This has quite a few uses, however I use it for one thing. Ever had
your backspace key produce ^H's? try "stty erase backspace"

command;command - Do you want to put multiple commands in one line? Use ;
to separate them and they'll be performed one after eachother. For instance
ls;uptime;cp blah review;./eggdrop u -m

-z3r0phr34k (Stan)
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