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move contents of the current directory to the parent directory, then remove current directory.
I think this is less resource consuming than the previous examples

Realtime lines per second in a log file
Displays the realtime line output rate of a logfile. -l tels pv to count lines -i to refresh every 10 seconds -l option is not in old versions of pv. If the remote system has an old pv version: ssh tail -f /var/log/apache2/access.log | pv -l -i10 -r >/dev/null

How to get an absolute value
Whenever we are only interested in difference between two numbers and not the positive/negative values we can use this in script.

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"

Convert ascii string to hex
Converts the ascii text to hex from bash. Check the sample output.

How to know the total number of packages available

use the previous commands params in the current command
Here the !!:1 will take the first parameter from the previous command. This can be used in conjunction with other history commands like ! and so on.

Get the current svn branch/tag (Good for PS1/PROMPT_COMMAND cases)
uses just one sed

Show a listing of open mailbox files (or whatever you want to modify it to show)

List status of your git repos and let us know if there is any new files to commit.
Source: http://www.bashoneliners.com/oneliners/oneliner/225/


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