SHELL

pass parameters to bash script

# Run the script with the arguments as you would for
# every other command.
# Example: ./script.sh arg1 arg2 

#!/bin/sh
echo "argument1: $1"
echo "argument2: $2"

# Output: 
# argument1: arg1
# argument2: arg2

linux shell parameter

# bash arguments cheatsheet
$1, $2, ... -> are the positional parameters.
"$@"        -> is an array-like construct of all positional parameters, {$1, $2, $3 ...}.
"$*"        -> is the IFS expansion of all positional parameters, $1 $2 $3 ....
$#          -> is the number of positional parameters.
$-          -> current options set for the shell.
$$          -> pid of the current shell (not subshell).
$_          -> most recent parameter (or the abs path of the command to start the current shell immediately after startup).
$IFS        -> is the (input) field separator.
$?          -> is the most recent foreground pipeline exit status.
$!          -> is the PID of the most recent background command.
$0          -> is the name of the shell or shell script.

bash parse arguments

#!/bin/bash

SHORT=c:,d:,h
LONG=city1:,city2:,help
OPTS=$(getopt --alternative --name weather --options $SHORT --longoptions $LONG -- "$@")

bash params

read variable1
read variable2
...