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Generate SHA1 hash for each file in a list
List files and pass to openssl to calculate the hash for each file.

Get absolut path to your bash-script
Another way of doing it that's a bit clearer. I'm a fan of readable code.

Huh? Where did all my precious space go ?
Sort ls output of all files in current directory in ascending order Just the 20 biggest ones: $ ls -la | sort -k 5bn | tail -n 20 A variant for the current directory tree with subdirectories and pretty columns is: $ find . -type f -print0 | xargs -0 ls -la | sort -k 5bn | column -t And finding the subdirectories consuming the most space with displayed block size 1k: $ du -sk ./* | sort -k 1bn | column -t

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"

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"

Find the package that installed a command

dd if=/dev/null of=/dev/sda
removes all files/filesystems of a harddisk. It removes EVERYTHING of your hard disk. Be carefull when to select a device. It does not prompt for and second check.

Truncate 0.3 sec from an audio file using sox
Using this command one can cut a piece from the end of an audio file.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Download all manuals RedHat 7 (CentOS/Fedora) with one command in Linux


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