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Adjust display hardware brightness [dbus way]

Rename files in batch

Install a Firefox add-on/theme to all users
To install a theme use: $ sudo firefox -install-global-theme /path/to/theme You can get the .xpi or .jar file from the versions history on the add-on/theme page. NOTE: may not work in your system (Debian-based is an example).

Switch to a user with "nologin" shell
You need sudo privileges for this command. Replace username with actual username.

recursively change file name from uppercase to lowercase (or viceversa)
or, to process a single directory: $ for f in *; do mv $f `echo $f |tr '[:upper:]' '[:lower:]'`; done

Download Video & extract only a specific Time of it

Get the full path to a file
Useful in scripts when the file is passed in as an argument. Eg. $ filepath=$(realpath $1)

list all crontabs for users
additionally use "find /etc/cron*" for cronscripts

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"

Empty a file


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