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Perl Command Line Interpreter
Can also just use the debug mode like this.

Remove a line in a text file. Useful to fix "ssh host key change" warnings

See system users

To create files with specific permission:

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.

Show all mergeinfo for a svn subtree

Sort files in folders alphabetically
Creates one letter folders in the current directory and moves files with corresponding initial in the folder.

Erase CD RW

Automatically tunnel all ports of running docker instances in boot2docker
It requires https://jqplay.org/, that comes with brew: brew install jq

Random IPv4 address


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