Commands using set

A tweak using Patola's code as a base, this full-width green matrix display has all the frills (and all the printable characters).

You don't need the surrounding parens if you don't care about losing globbing capabilities. Z-shell (/bin/zsh) needs neither the parens nor the `set -o noglob`

Screen shot (animated): http://desmond.imageshack.us/Himg32/scaled.php?server=32&filename=matrixh.gif&res=landing

If it's too slow, try lowering the `sleep 0.05` or even replacing it with `true` (which is faster than `sleep 0`).

I squashed it as narrow as I could to conserve space, though somebody could probably squeeze a char or two out.

Enjoy!

Checks whether your power supply is still plugged in.

If not it will trigger an alarm at maximum volume.

Change Random Wallpaper on Gnome 3

If you need to fix a randomly failing test (race condition), you need to run it until you get that hard-to-reproduce failure.

Move efficiently between directories.

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This command adds a couple of extra features to cd, without affecting normal use.

CDPATH use is also unaffected. It introduces and environment variable CDDIR which is used as an alternate home directory.

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Note: I don't want to alter $HOME because then all my dot files will move.

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Examples:

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Change directory to "dir" (using CDPATH if necessary)

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Change directory to "dir" (containing folder of "file.txt")

This allows you to cut'n'paste, or use

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CDDIR is unset

Change directory to $HOME

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CDDIR=/home/flatcap/work

Change directory to /home/flatcap/work

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For convenience, put the command, and the following, in your .bashrc or .bash_profile

export CDDIR="/home/flatcap/work"

alias cdd="CDDIR=$(pwd)"

set colsep "&TAB" -- for tab separator

set colsep "|" -- for pipe separator

etc...

Mutes the speakers after an hour, in case you fall asleep watching a video...

useful if you want to get the source code of a in memory function

setting gdb with this option / breakpoint before running the process will cause it to break whenever an memory allocation operation is not kosher.

The biggest advantage over atoponce's nifty original is not killing the scrollback. Written assuming bash, but shouldn't be terribly difficult to port to other shells. S should be multiple spaces, but I can't get commandlinefu to save/show them properly, any help?

Open a file directly with execution permission.

Put the function in your .bashrc

You can also put this in your vimrc:

and open a new file like this:

By default bash expands an unbound variable to an empty string. This can be dangerous, if a critical variable name (a path prefix for example) has a typo. The -u option causes bash to treat this as an error, and the -e option causes it to exit in case of an error. These two together will make your scripts a lot safer against typos.

The default behaviour can be explicitly requested using the ${NAME:-} syntax.

A (less explicit) variation: #!/bin/bash -eu

Turn shell tracing and verbosity (set -xv) on/off in any Bourne-type shell

If either -x or -v is set, the function turns them both off.

If neither is on, both are turned on.

Running this command turns shell tracing and shell verbose debugging on or off. Not only does it do that, it also uses your terminals builtin method of setting colors to make debugging much easier.

It looks at the current shell options contained in the $- special bash variable and that lets this function set the opposite of the current value. So from the shell you could do a:

and it will turn on debbuggin.

This is an amazingly useful function that is perfect to add system-wide by adding it to /etc/profile or /etc/bashrc.. You can run it from the shell, and you can also use it in your shell scripts like my .bash_profile - http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html

Prompts the user for username and password, that are then exported to http_proxy for use by wget, yum etc

Default user, webproxy and port are used.

Using this script prevent the cleartext user and pass being in your bash_history and on-screen

the 'set -x' mode can be exited by typing

If you set noclobber to on, bash won't allow redirection to overwrite existing files .

You can still append information but not overwrite the file .to turn it back off use : $ set +o noclobber .

I use it because i overwrite a file by accident , after thought , content of the file was very important , creating a one more file mean nothing for my hard disk (we are not anymore on the 64 k memory time) , but content of file is far much important . What we call exeprience :(

Once issuing the command, hit "esc" and then "k" (not together) to enter the search mode at the shell prompt (each time), and invoke the search with "/" as if you would in vi. Type a command and see the most recently used instance of that command. Use "n" and "N" to go forward and backwards through other instances of that command.