test/conditional API Reference
Bash test expressions — file, string and numeric comparisons used in [ ] and [[ ]] conditionals.
test/conditional
Test operators for use with the [ (test) command and the more powerful [[ ]] compound command.
[ -f file ]Returns true if file exists and is a regular file (not a directory or device).
Returns: boolean (exit status)
[ -d dir ]Returns true if dir exists and is a directory.
Returns: boolean (exit status)
[ -z string ]Returns true if the length of string is zero (empty).
Returns: boolean (exit status)
[ -n string ]Returns true if the length of string is non-zero (not empty).
Returns: boolean (exit status)
[ str1 = str2 ]Returns true if the two strings are equal. Use != for inequality.
Returns: boolean (exit status)
[ num1 -eq num2 ]Returns true if the two integers are equal. Other numeric ops: -ne, -lt, -le, -gt, -ge.
Returns: boolean (exit status)
[ -e path ]Returns true if path exists (any type: file, directory, symlink, etc.).
Returns: boolean (exit status)
[[ str =~ regex ]]Returns true if str matches the extended regular expression regex. Only in [[ ]], not [ ].
Returns: boolean (exit status)