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

sh
number&−
Closes output descriptor number. If you omit number, it closes the standard
output.
Normally, redirection applies only to the command where the redirection construct
appears; however, see exec.
The order of redirection specifications is significant, since an earlier redirection can
affect a later one. However, these specifications can be freely intermixed with other
command arguments. Since the shell takes care of the redirection, the redirection
constructs are not passed to the command itself.
Note: The shell performs the implicit redirections needed for pipelines before
performing any explicit redirections.
Filename Generation
The characters * ? [ are called glob characters, or wildcardcharacters. If an
unquoted argument contains one or more glob characters, the shell processes the
argument for filename generation. The glob characters are part of glob patterns,
whichrepresent file and directory names. These patterns are similar to regular
expressions, but differ in syntax, since they are intended to match filenames and
words (not arbitrary strings). The special constructions that may appear in glob
patterns are:
? Matches exactly one character of a filename, except for the separator
character / and a . at the beginning of a filename. ? only matches an
actual filename character and does not match nonexistent characters at the
end of the filename. ? is analogous to the metacharacter . in regular
expressions.
* Matches zero or more characters in a filename, subject to the same
restrictions as ?. * is analogous to the regular expression .*.
[chars]
Defines a class of characters; the glob pattern matches any single
character in the class. A class can contain a range of characters by writing
the first character in the range, a dash −, and the last character. For
example, [A−Za−z], in the POSIX locale, stands for all the uppercase and
lowercase letters. If you want a literal − character (or other glob character)
in the class, use the backslash to escape the character, causing it to lose
it’s special meaning within the pattern expression. If the first character
inside the brackets is an exclamation mark (!), the pattern matches any
single character that is not in the class.
Some sample patterns are:
[!a-f]*.c
Matches all .c files beginning with something other than the letters from a
through f.
/???/?.?
Matches all files that are under the root directory in a directory with a
three-letter name, and that have a basename containing one character
followed by a . followed by another single character.
566 z/OS V1R9.0 UNIX System Services Command Reference