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Convert from octal format to umask
Umask is obtained subtracting 7 from each cypher of octal format. I store octal perm format in an array,then for each element of array I subtract 7. The result is the umask.

List of computers not logged into in more than four weeks

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

JSON processing with Python
Validates and pretty-prints the content fetched from the URL.

Simulate slow network connection locally
Replace 500ms by the desired delay. To remove it: sudo tc qdisc del dev lo root netem delay 500ms

list files recursively by size

AWK Calculator

shorten url using curl, sed and is.gd
Just create a function in your .bashrc like this shorturl() { curl -s -d URL="$1" http://is.gd/create.php | sed '/Your new shortened/!d;s/.*value="\([^"]*\)".*/\1/' }

list block devices
Shows all block devices in a tree with descruptions of what they are.

Retry the previous command until it exits successfully
Repeat the previously used command (!!) until it exits with a success code (0). To put a delay between attempts you could do something like $ until !!; do sleep 5; done to wait 5 seconds after each attempt.


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