z/OS V1R9.0 UNIX System Services Command ... - Christian Grothoff

[[ test_expr ]]
The double-square-bracket command ([[ test_expr ]]) is a command that
returns an exit status indicating whether the test_expr (test expression) is
true or false.
Word-splitting and wildcard expansion (filename expansion or globbing) are
not done within [[ ]]. This makes quoting less necessary than when you use
the test (or [ ]) command. Alias expansion is also not done within [[ ]].
The following primitives are used in ([[ test_expr ]]). Spaces or tabs are
required to separate operators from operands.
–a file True if file exists (–e is recommended to avoid confusion with the
test command syntax)
–Aa file
True if file has an extended access ACL entry.
–Ad file
True if file has a directory default ACL.
–Af file
True if file has a file default ACL.
–b file True if file is a block special file (block special files are not
supported in z/OS)
–B file
True if the file is tagged as binary (not text)
–c file True if file is a character special file
–d file True if file is a directory
–e file True if file exists
–Ea file
True if the file has the APF extended attribute
–El file
True if the file has the shared library extended attribute
–Ep file
True if the file has the program control extended attribute
–Es file
True if the file has the shared address space extended attribute
–f file True if file is an ordinary file
–g file True if the set-group-ID attribute of file is on
–G file
True if file group owner is the effective group id
–h file True if file is a symbolic link
–k file True if file has the ″sticky″ bit on
–L file True if file is a symbolic link
-Ma file
True if the file has any Multilevel Security seclabel
–n string
True if the length of the string is greater than zero
sh
Chapter 2. Shell command descriptions 553