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File Test Operators

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A file test operator is a unary operator that tests a filename or a filehandle.

Operator Meaning

`-r`	File is readable by effective uid/gid.
`-w`	File is writable by effective uid/gid.
`-x`	File is executable by effective uid/gid.
`-o`	File is owned by effective uid.
`-R`	File is readable by real uid/gid.
`-W`	File is writable by real uid/gid.
`-X`	File is executable by real uid/gid.
`-O`	File is owned by real uid.

`-e`	File exists.
`-z`	File has zero size.
`-s`	File has non-zero size (returns size).

`-f`	File is a plain file.
`-d`	File is a directory.
`-l`	File is a symbolic link.
`-p`	File is a named pipe (FIFO).
`-S`	File is a socket.
`-b`	File is a block special file.
`-c`	File is a character special file.
`-t`	Filehandle is opened to a tty.

`-u`	File has setuid bit set.
`-g`	File has setgid bit set.
`-k`	File has sticky bit set.

`-T`	File is a text file.
`-B`	File is a binary file (opposite of `-T`).

`-M`	Age of file (at startup) in days since modification.
`-A`	Age of file (at startup) in days since last access.
`-C`	Age of file (at startup) in days since inode change.

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