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-r
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File is readable by effective uid/gid.
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-w
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File is writable by effective uid/gid.
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-x
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File is executable by effective uid/gid.
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-o
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File is owned by effective uid.
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-R
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File is readable by real uid/gid.
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-W
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File is writable by real uid/gid.
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-X
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File is executable by real uid/gid.
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-O
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File is owned by real uid.
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-e
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File exists.
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-z
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File has zero size (is empty).
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-s
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File has nonzero size (returns size in bytes).
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-f
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File is a plain file.
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-d
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File is a directory.
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-l
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File is a symbolic link (false if symlinks aren't supported by the file system).
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-p
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File is a named pipe (FIFO), or Filehandle is a pipe.
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-S
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File is a socket.
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-b
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File is a block special file.
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-c
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File is a character special file.
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-t
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Filehandle is opened to a tty.
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-u
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File has setuid bit set.
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-g
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File has setgid bit set.
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-k
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File has sticky bit set.
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-T
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File is an ASCII or UTF-8** text file (heuristic guess).
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-B
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File is a "binary" file (opposite of -T).
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-M
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Script start time minus file modification time, in days.
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-A
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Same for access time.
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-C
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Same for inode change time (Unix, may differ for other platforms)
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
