bash variable code example

Example 1: echo variable bash

echo "${var}"

Example 2: $@ bash

file:test.sh
#! /bin/sh
echo '$#' $#
echo '$@' $@
echo '$?' $?

*If you run the above script as*

> ./test.sh 1 2 3

You get output:
$#  3
$@  1 2 3
$?  0

*You passed 3 parameters to your script.*

$# = number of arguments. Answer is 3
$@ = what parameters were passed. Answer is 1 2 3
$? = was last command successful. Answer is 0 which means 'yes'

Example 3: shell script variable

TEXT="Hello World!"
echo $TEXT
# ouput: Hello World!

Example 4: definition varibale in bash

#create variable
fullname='Restu Wahyu Saputra'
echo $fullname

Example 5: bash create variable

#create a variable to store name
name="Lance Armah"

Example 6: assign a variable in bash

#!/bin/bash
# Naked variables

echo

# When is a variable "naked", i.e., lacking the '$' in front?
# When it is being assigned, rather than referenced.

# Assignment
a=879
echo "The value of \"a\" is $a."

# Assignment using 'let'
let a=16+5
echo "The value of \"a\" is now $a."

echo

# In a 'for' loop (really, a type of disguised assignment):
echo -n "Values of \"a\" in the loop are: "
for a in 7 8 9 11
do
  echo -n "$a "
done

echo
echo

# In a 'read' statement (also a type of assignment):
echo -n "Enter \"a\" "
read a
echo "The value of \"a\" is now $a."

echo

exit 0