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continuously check size of files or directories
very handy if you copy or download a/some file(s) and want to know how big it is at the moment

Sum columns from CSV column $COL

Ripping VCD in Linux
Ripping VCD in Linux

Find broken symlinks and delete them
This command is adapted from http://otomaton.wordpress.com/2012/12/26/find-broken-symbolic-links/ Solutions with $ find -L don't work when the link is a loop, an error message is printed.

File rotation without rename command
Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

concatenate compressed and uncompressed logs
I use zgrep because it also parses non gzip files. With ls -tr, we parse logs in time order. Greping the empty string just concatenates all logs, but you can also grep an IP, an URL...

convert a pdf to jpeg
Converts a .pdf to .jpg . should work with jpeg | tiff | png | gif | jp2 | pict | bmp | qtif | psd | sgi | tga

set history file length
set how many commands to keep in history Default is 500 Saved in /home/$USER/.bash_history Add this to /home/$USER/.bashrc HISTFILESIZE=1000000000 HISTSIZE=1000000

See system users

Grep for word in directory (recursive)
greps for search word in directory and below (defaults to cd). -i case insensitive -n shows line number -H shows file name


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