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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.

gpg decrypt several files
Change directory (cd) to the directory where all your encrypted files are placed, and then run the command - then you are asked to insert your secret gpg password - ubuntu 8.04

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

cloning partition tables under Solaris

Better recursive grep with pretty colors... requires ruby and gems (run: "gem install rak")

Url Encode

Retrofit a shebang to an existing script
Function to add a shebang to an existing script, handy if you forgot to add it in the first place.

Prepend a text to a file.
The original command is great, but I often want to prepend to every line.

Download a file and uncompress it while it downloads
This will uncompress the file while it's being downloaded which makes it much faster

Rename files in batch


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