July 2002
Beginner to intermediate
96 pages
1h 53m
English
Content preview from Perl Pocket Reference, 4th Edition
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Chapter 24. File Test Operators
These unary operators take one argument, either a filename or a filehandle, and test the associated file to see if something is true about it. If the argument is omitted, they test $_ (except for -t, which tests STDIN). If the special argument _ (underscore) is passed, they use the information from the preceding test or stat call.
See also the filetest pragma.
| File is readable/writable/executable by effective uid/gid. |
| File is readable/writable/executable by real uid/gid. |
| File is owned by effective/real uid. |
| File exists/has zero size. |
| File exists and has non-zero size. Returns the size. |
| File is a plain file/a directory. |
| File is a symbolic link/a socket/a named pipe (FIFO). |
| File is a block/character special file. |
| File has setuid/setgid/sticky bit set. |
| Filehandle (default |
| File is a text/non-text (binary) file. These tests return true on an empty file, or a file at EOF when testing a filehandle. |
| Returns the modification/access/inode-change time of the file. The value is relative to the time the program started and expressed in fractional days. See also |
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