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convert single digit to double digits
each number in a file name gets expanded to the number of digets provided as arg_1 of the arguments in rjust_file_nums. Put the funciton in the .bashrc file. Be sure to $ source ~/.bashrc so that the function will be accessible from bash.

Delete empty directories
Recursively delete empty directories. Use with care.

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"

Generate Random Passwords
If you want a password length longer than 6, changing the -c6 to read -c8 will give you 8 random characters instead of 6. To end up with a line-feed, use this with echo: # echo `< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c6` Modern systems need higher strenght, so add some special characters: # < /dev/urandom tr -dc '12345!@#$%qwertQWERTasdfgASDFGzxcvbZXCVB' | head -c8

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Copy recursivelly files of specific filetypes
Copying only wmv and mpg files recursively from to

Copy recursivelly files of specific filetypes
Copying only wmv and mpg files recursively from to

Dumping Audio stream from flv (using ffmpeg)

grep for minus (-) sign
Use flag "--" to stop switch parsing

Monitor dynamic changes in the dmesg log.
Other logs can be monitored similarly, e.g. $ watch "tail -15 /var/log/daemon.log"


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