Shell Script (a) entry

Shell script to start learning.

#!/bin/bash

if [ $UID -ne 0 ]; then
    echo "you are not root"
else
    echo "you are root"
fi

var="hello world"
echo $var
echo ${var}
echo "var is $var"
echo 'var is $var'
echo "length of var is ${#var}"

 

important point:

　　1. var = "hello world", with no spaces on both sides of the equal sign.

　　2. Invalid variable substitution in single quotes.

 

References:

"Linux Shell Scripting Raiders"

Reproduced in: https: //www.cnblogs.com/gattaca/p/6908278.html