7.2.3. Nested if statements
Inside the if statement, you can use another if statement. You may use as many levels of nested if s as you can logically manage.
This is an example testing leap years:
anny ~/testdir> cat testleap.sh
#!/bin/bash
# This script will test if we're in a leap year or not.
year='date +%Y'
if [ $[$year % 400] -eq "0" ]; then
echo "This is a leap year. February has 29 days."
elif [ $[$year % 4] -eq 0 ]; then
if [ $[$year % 100] -ne 0 ]; then
echo "This is a leap year, February has 29 days."
else
echo "This is not a leap year. February has 28 days."
fi
else
echo "This is not a leap year. February has 28 days."
fi
anny ~/testdir> date
Tue Jan 14 20:37:55 CET 2003
anny ~/testdir> testleap.sh
This is not a leap year.
* License
