This runs a command continuously, restarting it if it exits. Sort of a poor man's daemontools. Useful for running servers from the command line instead of inittab.

The Festival Speech Synthesis System converts text into sound.

Or: links -dump http://youfavoritewebsite.com | festival --tts

This one-liner outputs a random number between the values given for FLOOR and RANGE.

is the runtime linker/loader for ELF binaries on Linux.

=(cmd) is a zsh trick to take the output for the command "inside" it and save it to a temporary file.

pipes the C source to gcc. -x c tells gcc that it's compiling C (which is required if it's reading from a pipe). -o /dev/stdout - tells it to write the binary to standard output and read the source from standard input.

because of the the =() thing, the compiled output is stashed in a tempfile, which the loader then runs and executes, and the shell tosses the tempfile away immediately after running it.

This will cause your machine to INSTANTLY reboot. No un-mounting of drives or anything.

Very handy when something has gone horribly wrong with your server in that co-location facility miles away with no remote hands!

Suspect this works with all 2.2, 2.4 and 2.6 Linux kernels compiled with magic-syskey-request support.

If you have some textfile with an unknown encoding you can use this list to find out

More info here: http://nagioswiki.com/wiki/index.php/Checking_/proc/mounts_on_remote_server

see sample output

any HTTP requests to the machine on the specified port will be redirected to http://www.whatevs.com... quick, dirty, works fine for sites w/

above line in .bash_profile will give you window title in putty or terminal client when you login to your remote server

The $[...] block in bash and zsh will let you do math.

This is the same as using $((...)), which also works in ksh. Of course, this is a simple, dumb wrapper and doesn't allow floating-point.

Countdown from 10 or whatever you want:)

unsets variables used by the one-liner

sets up the IFS bash variable to not be affected by whitespace and disables extra glob expansion

uses read to slurp the results of the find command into an array

selects an element of the array at random to be passed as an argument to mplayer

This is the solution to the common mistake made by sudo newbies, since

does NOT add to the file as root.

Alternatively,

should be replaced by

And you can add a >/dev/null in the end if you're not interested in the tee stdout :

If you are using an xterm emulation capable terminal emulator, such as PuTTY or xterm on Linux desktop, this command will replace the title of that terminal window. I know it is not nice to have seventeen terminals on your desktop with title PuTTY, you can not tell which one is connected to which server and doing what.

Even though the string between the quotes is typed as literals, it needs a little more finesse to make it work. Here is how it is done key-by-key:

echo "( ctrl-v then ctrl-[ )0;Enter_Title_String_Here( ctrl-v then ctrl-g )"( enter )

ctrl-v : means hold down ctrl key and hit v at the same time like you are pasting in windoze ; also please don't type the parentheses, i.e., ( and )

When expanding, bash output the command, so don't be affraid if you type the command.

Here is the details:

First examples:

First argument:

echo barfoo

barfoo

(Note that typing echo foo bar foobar barfoo && echo !$, bash substitute !$ with $:1)

Last argument:

echo foo bar foobar barfoo && echo barfoo

foo bar foobar barfoo

barfoo

All the arguments:

echo foo bar foobar barfoo

foo bar foobar barfoo

The third argument:

echo foo bar foobar barfoo && echo foobar

foo bar foobar barfoo

foobar

You may want to add {} for large numbers: echo !:{11} for example

Now with path:

/usr/bin/foobar

For the head:

echo /usr/bin

/usr/bin

And the tail:

echo foobar

foobar

You also may want to try !:h and !:t or !!3-4 for the third and the fourth (so !!:* == !!:1-$)

seq allows you to format the output thanks to the -f option. This is very useful if you want to rename your files to the same format in order to be able to easily sort for example:

And

foo1

foo10

foo4

foo7

But:

So

foo01

foo04

foo07

foo10

This commands lets you generate a random number between the range [$START; $END].

I know its not much but is very useful in time consuming scripts (cron, rc.d, etc).

show phpinfo(); from the command line

This command converts a MySQL query directly into a .csv (Comma Seperated Value)-file.