Bash

Bash is a command line tool and language.

Files

List files

Number of files in a provided directory

ls [myDirectory] | wc -l 

Manipulate Files

Remove directory tree with all its contents

rm -rf [myDirectory]

File Permissions

Show access permissions of file in directory

ls -l [myDirectory]

Change permissions of file

chmod u=rwx,g=rwx,o=rwx [myFile]

Explanation

Control structures

Use commandline arguments

while getopts :c:t flag
do
    case "${flag}" in
        c) 
            config=${OPTARG}
            python3 file_to_be_called.py -c $config
            ;;
        t)
            python3 file_to_be_called.py -t
            ;;
        :) 
            echo "No arguments passed"
            exit 1
            ;;
        ?) 
          echo "Please call the script like this: bash_script.sh [-c config_file]"
          exit 1
          ;;
    esac
done

The : before the flag-character c lets you handle errors yourself (e.g. no arguments passed and wrong arguments passed). The : after the flag-character c indicates that a value is required after the flag.

Processes

List running processes

htop

Commands
Help	hh
Kill process	k
Order processes by memory consumption	Shift-MShift-M
Filter processes by user	UU
Display files used by the selected process	LL
Display user threads	Shift-HShift-H

Kill process

kill -9 [process-PID]

Info on resource usage & processes on NVidia graphic cards

nvidia-smi