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Show every subdirectory (zsh)

Know SELinux status
Usefule to check whether SELinux is in force or disabled. Though you need to be superuser while execute this command.

View the latest astronomy picture of the day from NASA.
Substitute feh for the image viewer of your choice. display (part of imagemagick) seems to be a popular choice.

On-the-fly unrar movie in .rar archive and play it, does also work on part archives.

Show Directories in the PATH Which does NOT Exist
I often need to know of my directory in the PATH, which one DOES NOT exist. This command answers that question * This command uses only bash's built-in commands * The parentheses spawn a new sub shell to prevent the modification of the IFS (input field separator) variable in the current shell

Replace spaces in filenames with underscores
I realize there's a few of these out there, but none exactly in this form, which seems the cleanest to me

list block devices
Shows all block devices in a tree with descruptions of what they are.

check open ports without netstat or lsof

cat large file to clipboard with speed-o-meter
shortest alternative without the speed-o-meter"xclip large.xml" "xclip -o" to get the clipboard content, alternatively [shift key] + insert or middle button of your mouse.

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"


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