cheat sheets.

Cheat Sheet Title: [ no_spaces_alphanumeric_only ]

Cheat Sheet:
Kernel.test is a handy ruby method when working with the filesystem: Usage: Kernel.test(int_cmd, file1 [, file2] ) Here are tests for a single file: Test Returns Meaning ?A | Time | Last access time for file1 ?b | boolean | True if file1 is a block device ?c | boolean | True if file1 is a character device ?C | Time | Last change time for file1 ?d | boolean | True if file1 exists and is a directory ?e | boolean | True if file1 exists ?f | boolean | True if file1 exists and is a regular file ?g | boolean | True if file1 has the \CF{setgid} bit | | set (false under NT) ?G | boolean | True if file1 exists and has a group | | ownership equal to the caller's group ?k | boolean | True if file1 exists and has the sticky bit set ?l | boolean | True if file1 exists and is a symbolic link ?M | Time | Last modification time for file1 ?o | boolean | True if file1 exists and is owned by | | the caller's effective uid ?O | boolean | True if file1 exists and is owned by | | the caller's real uid ?p | boolean | True if file1 exists and is a fifo ?r | boolean | True if file1 is readable by the effective | | uid/gid of the caller ?R | boolean | True if file is readable by the real | | uid/gid of the caller ?s | int/nil | If file1 has nonzero size, return the size, | | otherwise return nil ?S | boolean | True if file1 exists and is a socket ?u | boolean | True if file1 has the setuid bit set ?w | boolean | True if file1 exists and is writable by | | the effective uid/gid ?W | boolean | True if file1 exists and is writable by | | the real uid/gid ?x | boolean | True if file1 exists and is executable by | | the effective uid/gid ?X | boolean | True if file1 exists and is executable by | | the real uid/gid ?z | boolean | True if file1 exists and has a zero length Here are tests for multiple files: ?- | boolean | True if file1 and file2 are identical ?= | boolean | True if the modification times of file1 | | and file2 are equal ?< | boolean | True if the modification time of file1 | | is prior to that of file2 ?> | boolean | True if the modification time of file1 | | is after that of file2

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