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Create an alias, store it in ~/.bash_aliases and source your new alias into the ~/.bashrc
This is useful if you use a shell with a lot of other users. You will be able to run "topu" to see your running processes instead of the complete 'top -u username'. Read more on alias: http://man.cx/alias

Convert CSV to JSON - Python3 and Bash function
Based / Inspired by malathion's below command http://www.commandlinefu.com/commands/view/20528/convert-csv-to-json Is written for python3 and is very easy to use csv2json *csv will convert all files ending in csv to json eg csv2json file.csv will output a file to file.json Validity of json tested in python3 and below site https://jsonformatter.curiousconcept.com/

Remove space and/or tab characters at the end of line
The command removes all space and/or tabulation characters preceding new line

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

swap stdout and stderr
Possible use, to filter something in stderr: (/usr/bin/$COMMAND $PARAM 3>&1 1>&2 2>&3 | grep -v $uninteresting_error ) 3>&1 1>&2 2>&3

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"

Gives you what's between first string and second string included.
If the file content is : - Blah blah blah ABC hello blah blah blah bloh bloh bloh DEF Bah bah bah - You'll get: - ABC hello blah blah blah bloh bloh bloh DEF

check open ports without netstat or lsof

convert MTS video file format into xvid/mp3 avi format

remove password from openssl key file
Strip a password from a openssl key to use with apache httpd server


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