A powerfull way to rename file using sed groups.

& stand for the matched expression.

\1 referes to the first group between parenthesis. \2 to the second.

This command list and sort files by size and in reverse order, the reverse order is very helpful when you have a very long list and wish to have the biggest files at the bottom so you don't have scrool up.

The file size info is in human readable output, so ex. 1K..234M...3G

Tested with Linux (Red Hat Enterprise Edition)

64 elements max on 16 rows, 4 cols.

GNU Barcode will adapt automagically the width and the eight of your elements to fill the page.

Standard output format is PostScript.

Suppose that you had change in a directory like /home/user/mycode/code, and now you need to list it, instead of type entire path again, use ls !$ to recall path and list. Useful with many commands, this is only an example. (In this case, same result can be achivied with ls .)

Shows all linked file and destinations. The 'ls -l' command lists the files in long (1 file per line) format, and the grep command displays only those lines that starts with an l (lower case L) -- a linked file.

Updated: Remove reference to hard links because this command does not apply to hard link as others kindly pointed out.

List files above a given size threshold.

head by default displays first ten lines of its output. Use 'head -nXX' to display the XX largest files

Finds all files of a certain name and reports all line with the string. Very simple.

Coming back to a project directory after sometime elsewhere?

Need to know what the most recently modified files are?

This little function "t" is one of my most frequent commands.

I have a tcsh alias for it also:

alias t 'ls -ltch \!* | head -20'

Allows for quick mass renaming, assuming the user has some familiarity with regular expressions. Basically, it replaces the original_file_name in the output of ls with

"mv -v original_file_name new_file_name"

and passes the output to sh.

An alias i made for myself to play music in a faster way.

Works great when you have Guake / Tilda installed (Console that drops down like in the game QUAKE)

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I put this in my bash_alias file (I'm on ubuntu, the bash_alias file does autostart with the right config) but it works putting it in bashrc too. Or anything that autostarts when the console is opened.

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Needs Mplayer and music files to work. With out music theres nothing to play!

Oh, and also, without modification, this alias will try to play stuff from your ~/Music folder! (case sensitive). Make sure that folder exists and has music OR edit this alias to fit your needs.

If you want to operate on a set of items in Bash, and at least one of them contains spaces, the `for` loop isn't going to work the way you might expect. For example, if the current dir has two files, named "file" and "file 2", this would loop 3 times (once each for "file", "file", and "2"):

Instead, use a while loop with `read`:

I often deal with long file names and the 'ls -l' command leaves very little room for file names. An alternative is to use the -h -o and -g flags (or together, -hog).

* The -h flag produces human-readable file size (e.g. 91K instead of 92728)

* The -o suppresses the owner column

* The -g suppresses the group column

Since I use to alias ll='ls -l', I now do alias ll='ls -hog'

This command will grep the entire directory looking for any files containing the list of files. This is useful for cleaning out your project of old static files that are no longer in use. Also ignores .svn directories for accurate counts. Replace 'static/images/' with the directory containing the files you want to search for.

On my music directory, I create variable that contains all mp3s files, then I play them with mpg123. -C options enable terminal control key, s for stop, p for pause, f for forward to next song.

Substitute spaces in filename with underscore, it work on the first space encountered.

This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character.

Can pipe to tail or change the awk for for file size, groups, users, etc.

This command is almost the same as 'ls -a', but it does not display the current dir (.) or parent (..)