Conditionally perform a command.
Syntax if test-commands; then consequent-commands; [elif more-test-commands; then more-consequents;] [else alternate-consequents;] fi
The test-commands list is executed, and if its return status is zero, the consequent-commands list is executed.
If test-commands returns a non-zero status, each
elif list is executed in turn, and if its exit status is zero, the corresponding more-consequents is executed and the command completes.
If `else alternate-consequents' is present, and the final command in the final
elif clause has a
non-zero exit status, then alternate-consequents is executed.
For simple comparisons, a more concise option is to use a conditional operator instead of IF.
[ "$var" = "snark" ] && echo "found snark"
if [ "$var" = "snark" ];
then echo "found snark"
The return status is the exit status of the last command executed, or zero if no condition tested true.)
if is a bash builtin command.
"Then you admit confirming not denying you ever said that?"
"NO! ... I mean Yes! WHAT?"
I'll put `maybe' - Bloom County
awk - Find and Replace text within file(s)
eval - Evaluate several commands/arguments
expr - Evaluate expressions
for - Loop command
switch - Conditionally perform a command
while - Loop command