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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"

List all NPM global packages installed

Check whether laptop is running on battery or cable
The original proc file doesn't exist on my system.

Print process run time, average CPU usage, and maximum memory usage on exit
Bash has a built-in time command which provides less functionality than the real time command. Thus we reference /usr/bin/time directly. Since the command isn't very easy to remember you could alias it to something like "cputime" or even just "time".

Generate a playlist of all the files in the directory, newer first
I use this to generate a playlist with all the podcasts I listen to. Ordered from most recent to older.

Git diff last two commits
How about this one ?

Sort movies by length, longest first
Sort .avi movies by time length, print the longest first, and so on...

Insert a colon between every two digits
I sometimes have large files of MAC addresses stored in a file, some databases need the information stored with the semicolon (makes for easier programming a device) others don't. I have a barcode to text file scanner which usually butchers MAC addresses so this was the fix> I initially did this in awk ;) awk '{for(i=10;i>=2;i-=2)$0=substr($0,1,i)":"substr($0,i+1);print}' mac_address_list

list ips with high number of connections

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


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