Commands by karel1980 (4)

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Display duplicated lines in a file
Displays the duplicated lines in a file and their occuring frequency.

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"

Sort files by date
Show you the list of files of current directory sorted by date youngest to oldest, remove the 'r' if you want it in the otherway.

Length of longest line of code
Here's an awk version.

Remove a file whose name begins with a dash ( - ) character
Using the redundant ./ directory information prevents the dash from occurring at the beginning of the filename, and being interpreted as an option of the rm command. Also works using: $ rm -- -filename

Use a var with more text only if it exists
See "Parameter Expansion" in the bash manpage. They refer to this as "Use Alternate Value", but we're including the var in the at alternative.

Pretty-print user/group info for a given user

Get absolut path to your bash-script
Another way of doing it that's a bit clearer. I'm a fan of readable code.

show git logging
shows some logging for the git repo.

Revert an SVN file to previous revision
M - current revision, N - older revision


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