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Recursively change permissions on files, leave directories alone.

list folders containing less than 2 MB of data
Just shortened the awk a bit and removed sed. Edit: I'm assuming there are no spaces in the path. To support white space in pathname try: $ awk '($1 < 2048) {sub(/^[0-9]+[ \t]+/,""); print $0}'

remote diff with side-by-side ordering.
more information: man sdiff

Show account security settings
Show account security settings

Get your external IP address ( 10 characters long )
Shortest url to a external IP-service, 10 characters.

Stat each file in a directory
Possible simplification of egrep-awk-sort with find and -exec with xargs.

Query well known ports list
Uses the file located in /etc/services

Backup trought SSH

which program is this port belongs to ?
Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !

Turn off your laptop screen on command
echo 'alias monitor_off="sleep 1; xset dpms force standby"' >> ~/.bash_aliases ; . ~/.bash_aliases # now monitor_off does what you think


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