Commands using command

Appends output to the file, some systems require the -a to do this.

taken from

http://www.unix.com/shell-programming-scripting/158311-how-tee-stderr.html

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What does it mean?

The redirection operator n>&m makes file descriptor n to be a copy of file descriptor m. So, whe are:

- Opening a new file descriptor, 3, that is a copy of file descriptor 1, the standard output;

- Making file descriptor 1 a copy of file descriptor 2, the standard error output;

- Making file descriptor 2 to be a copy of file descriptor 3 (the "backup" of the standard output)

in a short: we swapped the standard output and the standard error output.

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see: https://groups.google.com/forum/?fromgroups=#!topic/vim_use/e3Er8x_P8jg

Changes dir to $1 and executes ls. As simple as useful

Using "func" to run any command and receive output from all your systems. Default output from func is normally meant for further script parsing, but is generally readable. This example shows system arch, but any command can be used and will run as typed.

Don't do this:

Using a bash "here strings" and "here documents" look leeter than piping echo into the command. Also prevents subshell execution. Word is also expanded as usual.

Calls sudo tee like all the other lines, but also automatically reloads the file.

Optionally you can add

command Wq :execute ':W' | :q

and

command WQ :Wq

to make quitting easier

it is generally advised to avoid using which(1) whenever possible. which(1) is usually a csh(1) script, or sometimes a compiled binary. It's output is highly variable from operating system to operating system, so platform independent scripts could become quite complicated with the logic. On HP-UX 10.20, for example, it prints "no bash in /path /path /path ..."; on OpenBSD 4.1, it prints "bash: Command not found."; on Debian (3.1 through 5.0 at least) and SuSE, it prints nothing at all; on Red Hat 5.2, it prints "which: no bash in (/path:/path:...)"; on Red Hat 6.2, it writes the same message, but on standard error instead of standard output; and on Gentoo, it writes something on stderr. And given all these differences, it's still variable based on your shell. This is why POSIX is king. See http://mywiki.wooledge.org/BashFAQ/081 for more ways on avoiding which(1).

Same as previous but compatible with BSD/IPSO

This is a equivalent to the GNU ' readlink' tool, but it supports following all the links, even in different directories.

An interesting alternative is this one, that gets the path of the destination file

Run this before you run a command in order to see what the command does as it starts.

The -c flag is useful here as the PID is unknown before startup.

All config files, libraries, logs, ports, etc used by the command as it starts up, (and shuts down) will be captured at 1s intervals and written to a file.

Useful for debugging etc.

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)"

Actually $! is an internal variable containing PID of the last job in background.

More info: http://tldp.org/LDP/abs/html/internalvariables.html#PIDVARREF

Using $! for job control:

Source: http://www.eggheadcafe.com/software/aspnet/35700746/calculating-md5sum-strings-from-within-awk.aspx

squeezed the monster (and nifty ☺) command from 7776 from 531 characters to 284 characters, but I don't see a way to get it down to 255. This is definitely a kludge!

create the function and run with

Great for channels like ukfDrumAndBass that only post music. No more need for third party browser plugins or websites that only convert one vid one at a time. It'll convert and save to CWD up to 300 of a user's videos to mp3s, one at a time. To increase, just increment the $count pattern. This is a concoction from commands #7718 and #7752, so it uses ffmpeg wget, curl, sed, and youtube-dl -- youtube-dl is only used to get the title of the video which it uses to name the mp3 file. You can use a different naming method if you want and the function should still work.

Test scenario:

* Open xterm (or konsole, ...)

* Start xeyes with: ( xeyes & )

* Close the xterminal

The xeyes process should be still running.

Yep, now you can finally google from the command line!

Here's a readable version "for your pleasure"(c):

Enjoy :)

This command will copy command's output into your local clipboard

5 helpful aliases for using the which utility, specifically for the GNU which (2.16 tested) that is included in coreutils.

Which is run first for a command. Same as type builtin minus verbosity

Which (a)lias

Which (f)unction

Which e(x)ecutable file in PATH

Which (all) alias, function, builtin, and files in PATH

# From my .bash_profile http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html