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.

This command is much quicker than the alternative of "sort | uniq -c | sort -n". Show Sample Output

order the files by modification (thanks stanishjohnd) time, one file per output line and filter first 10

This allows the output to be sorted from largest to smallest in human readable format.

Hides some entries from listing.

With zsh.

I find it very handy to be able to quickly see the most recently modified/created files in a directory. Note that the "q" option will reveal any files with non-printable characters in their filename. Show Sample Output

Do ls with permissions written in octal form. Show Sample Output

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. Show Sample Output

Sort ls output of all files in current directory in ascending order Just the 20 biggest ones: ls -la | sort -k 5bn | tail -n 20 A variant for the current directory tree with subdirectories and pretty columns is: find . -type f -print0 | xargs -0 ls -la | sort -k 5bn | column -t And finding the subdirectories consuming the most space with displayed block size 1k: du -sk ./* | sort -k 1bn | column -t

Useful for deleting old unused log files.

no need for rpm, no need for piping to another command. also no real fu but lacking in unnecessary complexity and distro specific commands.

This command will show an random command. this is useful if you want to explore various random commands.

strace can be invaluable in trying to figure out what the heck some misbehaving program is doing. There are number of useful flags to limit and control its output, and to attach to already running programs. (See also 'ltrace'.) Show Sample Output

This command specifies the size in Kilobytes using 'k' in the -size +(N)k option. The plus sign says greater than. -exec [cmd] {} \; invokes ls -l command on each file and awk strips off the values of the 5th (size) and the 9th (filename) column from the ls -l output to display. Sort is done in reversed order (descending) numerically using sort -rn options. A cron job could be run to execute a script like this and alert the users if a dir has files exceeding certain size, and provide file details as well. Show Sample Output

Note that the file at the given path will have the contents of the (still) deleted file, but it is a new file with a new node number; in other words, this restores the data, but it does not actually "undelete" the old file. I posted a function declaration encapsulating this functionality to http://www.reddit.com/r/programming/comments/7yx6f/how_to_undelete_any_open_deleted_file_in_linux/c07sqwe (please excuse the crap formatting).

Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.