EN
Bash - check if string is empty
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This article will show you how to check if the string is empty in Bash.
Quick solution:
#!/bin/bash
variable="Sample text"
[ -z "$variable" ] && echo "variable is empty" || echo "variable is not empty"
Example output:
variable is not empty
Practical examples
1. With control operators
#!/bin/bash
variable="Sample text"
empty_variable=""
[ -z "$variable" ] && echo "variable is empty" || echo "variable is not empty"
[ -z "$empty_variable" ] && echo "empty_variable is empty" || echo "empty_variable is not empty"
Example output:
variable is not empty
empty_variable is empty
2. With if statement
#!/bin/bash
variable="Sample text"
if [ -z "$variable" ]
then
echo "variable is empty"
else
echo "variable is not empty"
fi
Output:
variable is not empty
Alternative if statement example
#!/bin/bash
variable="Sample text"
if test -z "$variable"
then
echo "variable is empty"
else
echo "variable is not empty"
fi
Output:
variable is not empty