In order to write bash-scripts, I often do the task manually to see how it works. I type ### at the start of my session.

The function fetches the commands from the last occurrence of '###', excluding the function call. You could prefix this with a here-document to have a proper script-header.

Delete some lines, add a few variables and a loop, and you're ready to go.

This function could probably be much shorter...

Useful to add a timestamp to every line printed to stdout.

You can use `-Ins` instead of `-Iseconds` if you want more precision.

I'm not sure what apt this is, but it seems to work on most X screens, an is useful for saving power, and not straining your eyes

Check if your open ports as listed by lsof are actually accepting connections using netcat.

Requires that bash has extglob enabled: shopt -s extglob

Edit YYYY and MM at the beginning of the command with the year and month you want.

Note that `DD=$(printf "%02d" $d)` will pad single digit integers with a leading zero.

Substitute `echo $YYYY$MM$DD` at the end of the line with the command you want to launch, for instance

script.pl --yyyymmdd $YYYY$MM$DD

0 can also be replaced by the source name, e.g. alsa_output.pci-0000_00_1b.0.analog-stereo

A TCP server that keeps the same socket open, sending the contents of "file" repeatedly.

Feel free to put this in your ~/.profile:

Then use it to generate passwords:

Or DNA sequences:

lsblk | grep mountpoint

Will move in that case every file in the current folder older than 30 days to the "old" folder

Replace "mv $i old/" by any command such as rm / echo to do something different.

ip.telize.com (Listen on both IPv4 and IPv6)

ip4.telize.com (Listen on IPv4 only)

ip6.telize.com (Listen on IPv6 only)

More information on : http://www.telize.com

Piping a repeated character through the command will result in a single character only if there are more than 4 of them e.g.

echo "aaaaaa bbbbb cccc ddd" | sed -ru 's/(.)\1{4,}/\1/g'

the output will be "a b cccc ddd"

This will remove repeated characters e.g.

echo "xtxtxtxt" | sed -ru 's/(..)\1{2,}/\1/g'

the output will just be "xt"

Use the AWS CLI tools to generate a list instances, then pipe them to JQ to show only their launch time and instance id. Finally use sort to bring them out in runtime order. Find all those instances you launched months ago and have forgotten about.

This command uses -newerXY to show you the files that are modified since a specific date. I recommend looking for "-newerXY" on the manpage to get the specifics.

Install twistd first with

Renames all files in the following format

xxxxxx - 34. yyyyy.mp4

to the following format

xxxxxx S1E34 - yyyyy.mp4