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Vikid's Bash Cookbook |
Bash - if statements
if [ condition ]; then # you can use [[ ]] also
your code
fi
if [[ "${UID}" -eq 0 ]]
then
echo 'You are root'
else
echo 'You are not root'
fi
#!/bin/bash
if [ $(whoami) = 'root' ]; then
echo "You are root"
fi
In one line:
if [ $(whoami) = 'root' ]; then echo "root"; else echo "not root"; fi
#!/bin/bash
if [ $(whoami) = 'root' ]; then
echo "You are root"
else
echo "You are not root"
fi
#!/bin/bash
AGE=$1
if [ $AGE -lt 13 ]; then
echo "You are a kid."
elif [ $AGE -lt 20 ]; then
echo "You are a teenager."
elif [ $AGE -lt 65 ]; then
echo "You are an adult."
else
echo "You are an elder."
fi
#!/bin/bash
echo Script name: $0
echo $# arguments
if [$# -ne 1];
then echo "illegal number of parameters"
fi
$a -lt $b $a < $b
$a -gt $b $a > $b
$a -le $b $a <= $b
$a -ge $b $a >= $b
$a -eq $b $a is equal to $b
$a -ne $b $a is not equal to $b
-e $FILE $FILE exists
-d $FILE $FILE exists and is a directory.
-f $FILE $FILE exists and is a regular file.
-L $FILE $FILE exists and is a soft link.
$STRING1 = $STRING2 $STRING1 is equal to $STRING2
$STRING1 != $STRING2 $STRING1 is not equal to $STRING2
-z $STRING1 $STRING1 is empty
http:///wiki/?bashif
