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git diff of files that have been staged ie 'git add'ed

convert filenames in current directory to lowercase
This will convert filenames from uppercase to lowercase. I find this useful after downloading images from my digital camera. This works for English, but other languages may need something slightly more complex like this: $ for i in *; do mv "$i" "$(echo $i|tr [:upper:] [:lower:])"; done Also, the quote marks aren't necessary if your filenames don't contain spaces.

disable history for current shell session

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"

Copy via tar pipe while preserving file permissions (cp does not!; run this command with root!)
cp options: -p will preserve the file mode, ownership, and timestamps -r will copy files recursively also, if you want to keep symlinks in addition to the above: use the -a/--archive option

Find the package that installed a command

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 an image sequence into a video

Slow Down Command Output
( Or $ ls -lat|lolcat -a if you like it in technicolor - apt install lolcat if needed )

check site ssl certificate dates
remotely connects to an https site, fetches the ssl certificate and displays the valid dates for the cert


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