Shell Scripting Tutorial for Beginners 8 - Logical 'OR' Operator

#! /bin/bash

age=60

# for using OR operator use ||
if [ "$age" -gt 18] || ["$age" -lt 30 ]
then
  echo "valid age"
  else
  echo "age not valid"
fi

#  The -o option provide
# an alternative compound condition test.
if [ "$age" -gt 18 -o "$age" -lt 30 ]
then
  echo "valid age"
  else
  echo "age not valid"
fi

# if [[ $condition1 || $condition2 ]]    # Also works.
if [[ "$age" -gt 18 || "$age" -lt 30 ]]
then
  echo "valid age"
  else
  echo "age not valid"
fi