File Tests
If you want to test whether you can write to a file or if a direcory exists,
this may help a little when writing clean scripts with appropriate error messages
So here is a little collection of the most common file test operators in Perl:
File Test Operators Test Meaning -r File or directory is readable by this (effective) user or group -w File or directory is writable by this (effective) user or group -x File or directory is executable by this (effective) user or group -o File or directory is owned by this (effective) user -R File or directory is readable by this real user or group -W File or directory is writable by this real user or group -X File or directory is executable by this real user or group -O File or directory is owned by this real user -e File or directory name exists -z File exists and has zero size (always false for directories) -s File or directory exists and has nonzero size (the value is the size in bytes) -f Entry is a plain file -d Entry is a directory -l Entry is a symbolic link -S Entry is a socket Test Meaning -p Entry is a named pipe (a “fifo”) -b Entry is a block-special file (like a mountable disk) -c Entry is a character-special file (like an I/O device) -u File or directory is setuid -g File or directory is setgid -k File or directory has the sticky bit set -t The filehandle is a TTY (as reported by theisatty()system function; filenames can’t be tested by this test) -T File looks like a “text” file -B File looks like a “binary” file -M Modification age (measured in days) -A Access age (measured in days) |
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