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check open ports without netstat or lsof

Mount file system using back-up superblock
Found on http://www.cyberciti.biz/faq/linux-find-alternative-superblocks/

Parse a quoted .csv file
The $2, $3, $4 fields are arbitrary but note that the first field starts from $2 and the last field is $NF-1. This is due to the fact that the leading and trailing quotes are treated as field delimiters.

List all symbolic links in current directory
Many competing commands to do this, but since most people want a Long list with Human readable files sizes and want to see All files (including hidden (.*) files) this one wins on simplicity and usefulness. Plus grep is just as, if not more portable than sed or awk, and is more widely understood. :)

check open ports without netstat or lsof

Print a list of all hardlinks in the working directory, recursively
libpurple likes to hardlink files repeatedly. To ignore libpurple, use sed: | sed '/\.\/\.purple/d'

get rid of lines with non ascii characters
found here: https://stackoverflow.com/a/9035939

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

Calculate pi to an arbitrary number of decimal places

Batch rename extension of all files in a folder, in the example from .txt to .md
Batch rename extension of all files in a folder, in the example from .txt to .md mmv most likely must be installed, but is very powerfull when you want to move/copy/append/link multiple files by wildcard patterns.


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