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Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Count lines in a file with grep
Returns the number of lines in a file, emulates "wc -l" behavior with grep.

Exclude grep from your grepped output of ps (alias included in description)
Surround the first letter of what you are grepping with square brackets and you won't have to spawn a second instance of grep -v. You could also use an alias like this (albeit with sed): alias psgrep='ps aux | grep $(echo $1 | sed "s/^\(.\)/[\1]/g")'

Terminal redirection
Will redirect output of current session to another terminal, e.g. /dev/pts/3 Courtesy of bassu, http://www.commandlinefu.com/commands/by/bassu

Extract all GPS positions from a AVCHD video.

list files recursively by size

sniff network traffic on a given interface and displays the IP addresses of the machines communicating with the current host (one IP per line)

Remove a line in a text file. Useful to fix
In this case it's better do to use the dedicated tool

nmap port scanning
TCP Connect scanning for localhost and network 192.168.0.0/24

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.


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