SHELL

bash switch case

case $1 in
start)
    #Start logic
    ;;
stop)
    # Stop logic
    ;;
*)
	# Default logic
    echo $"Usage: $0 {start|stop}"
    exit 1
    ;;
esac

bash change case

# Basic syntax:
awk '{print tolower(string)}'
awk '{print toupper(string)}'

# Example usage:
awk '{print tolower($0)}' input_file
# This prints every row ($0) converted to lowercase

awk '{print toupper($3)}' input_file
# This would print the third field ($3) converted to uppercase