bash if statement
and - &&
or - ||
# and example
if [ -r $1 ] && [ -s $1 ]
then
echo This file is useful.
fi
# or example
if [ $USER == 'bob' ] || [ $USER == 'andy' ]
then
ls -alh
else
ls
fibash if statement
and - &&
or - ||
# and example
if [ -r $1 ] && [ -s $1 ]
then
echo This file is useful.
fi
# or example
if [ $USER == 'bob' ] || [ $USER == 'andy' ]
then
ls -alh
else
ls
fibash else if
if [ "$animal" == "penguin" ]; then
echo "Hmmmmmm fish... Tux happy!"
elif [ "$animal" == "dolphin" ]; then
echo "Pweetpeettreetppeterdepweet!"
else
echo "*prrrrrrrt*"
fi
if TEST-COMMANDS; then
CONSEQUENT-COMMANDS;
elif MORE-TEST-COMMANDS; then
MORE-CONSEQUENT-COMMANDS;
else
ALTERNATE-CONSEQUENT-COMMANDS;
fibash if statement
Operator Description
! EXPRESSION The EXPRESSION is false.
-n STRING The length of STRING is greater than zero.
-z STRING The lengh of STRING is zero (ie it is empty).
STRING1 = STRING2 STRING1 is equal to STRING2
STRING1 != STRING2 STRING1 is not equal to STRING2
INTEGER1 -eq INTEGER2 INTEGER1 is numerically equal to INTEGER2
INTEGER1 -gt INTEGER2 INTEGER1 is numerically greater than INTEGER2
INTEGER1 -lt INTEGER2 INTEGER1 is numerically less than INTEGER2
-d FILE FILE exists and is a directory.
-e FILE FILE exists.
-r FILE FILE exists and the read permission is granted.
-s FILE FILE exists and it's size is greater than zero (ie. it is not empty).
-w FILE FILE exists and the write permission is granted.
-x FILE FILE exists and the execute permission is granted.bash negate if
if [[ $? -ne 0 ]]; then # -ne: not equal
if ! [[ $? -eq 0 ]]; then # -eq: equal
if [[ ! $? -eq 0 ]]; thenCopyright © 2021 Codeinu
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