test

Command

test expression

Evaluate expression and return zero exit status if result is true, non zero status otherwise.

expression is one of:

• string1 == string2 - the strings are equal
• string1 != string2 - the strings are not equal
• string1 < string2 - string1 is lexicographically less than string2
• string1 <= string2 - string1 is lexicographically less or equal than string2
• string1 > string2 - string1 is lexicographically greater than string2
• string1 >= string2 - string1 is lexicographically greater or equal than string2
• integer1 -eq integer2 - integer1 is equal to integer2
• integer1 -ge integer2 - integer1 is greater than or equal to integer2
• integer1 -gt integer2 - integer1 is greater than integer2
• integer1 -le integer2 - integer1 is less than or equal to integer2
• integer1 -lt integer2 - integer1 is less than integer2
• integer1 -ne integer2 - integer1 is not equal to integer2
• prefixinteger1 -pgt prefixinteger2 - integer1 is greater than integer2 after stripping off common non-numeric prefix.
• prefixinteger1 -plt prefixinteger2 - integer1 is less than integer2 after stripping off common non-numeric prefix.
• file1 -nt file2 - file1 is newer than file2 (modification time). Optionally numeric bias may be directly appended to -nt in which case it is added to the first file modification time.
• file1 -ot file2 - file1 is older than file2 (modification time). Optionally numeric bias may be directly appended to -ot in which case it is added to the first file modification time.
• -d file - file exists and is a directory
• -e file - file exists
• -f file - file exists and is not a directory
• -s file - file exists and has a size greater than zero
• -n string - the length of string is nonzero
• string - string is equivalent to -n string
• -z string - the length of string is zero
• ( expression ) - expression is true
• ! expression - expression is false
• expression1 -a expression2 - both expression1 and expression2 are true
• expression1 expression2 - both expression1 and expression2 are true. This syntax is not POSIX-compliant and is not recommended.
• expression1 -o expression2 - either expression1 or expression2 is true