Commands by gtmanfred (2)

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Show running services (using systemctl)

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"

Exclude a string with awk

Change host name
With sed you can replace strings on the fly.

Recursively chmod all dirs to 755 and all files to 644

Git diff last two commits
How about this one ?

floating point operations in shell scripts
-l auto-selects many more digits (but you can round/truncate in your head, right) plus it loads a few math functions like sin().

Compress logs older than 7 days

Search for classes in Java JAR files.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.


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