411 REFERENCE · Wikibooks
Shell Programming/If
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
If while
The if statement has the following basic structure:
if [ condition of expressions ]; then
fi
Using && and || in control statements
The && and || can be used in control statements to represent nested loops like:
if [ condition1 ]; then
if [ condition 2 ]; then
fi
fi
as:
if [ condition1 ] && [ condition2 ]; then
fi