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Conditional Statements

January 12, 2010 - 9:30pm — Xuan Ngo

if syntax

#!/bin/bash
if [ true ]; then
echo "Always true"
fi
# -------------------- OR --------------------
# You can also move then down as follows.
if [ 1 ]
then
echo "Always true"
fi


if else syntax

#!/bin/bash
str_1="String 1"
str_2="String 2"
if [ "$str_1" = "$str_2" ]; then
	echo "Both strings are equal."
else
	echo "Both strings are not equal."
fi

if file exists

if [ -f testfile ]
then
  echo testfile exists!
fi

Expressions table:
TODO

Reference:
http://tille.garrels.be/training/bash/ch07.html
http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_01.html