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

Example
Localization
Exit Values
Messages
Limits
To display every line mentioning an astrological element:
egrep "earth|air|fire|water" astro.log
grep uses the following localization environment variables:
v LANG
v LC_ALL
v LC_COLLATE
v LC_CTYPE
v LC_MESSAGES
v LC_SYNTAX
v NLSPATH
See Appendix F for more information.
0 At least one match for pattern was found.
1 No matches for pattern were found.
2 Failure due to any of the following:
v The –e option was missing pattern.
v The –f option was missing patternfile.
v Out of memory for input or to hold a pattern.
v patternfile could not be opened.
v Incorrect regular expression.
v Incorrect command-line option.
v The command line had too few arguments.
v The input file could not be opened.
If the program fails to open one input file, it tries to go on to look at any
remaining input files, but it returns 2 even if it succeeds in finding matches
in other input files.
Possible error messages include:
input lines truncated—result questionable
One or more input lines were longer than grep could handle; the line has
been truncated or split into two lines. Shorten the line or lines, if possible.
This message does not affect the exit status.
out of space for pattern string
grep did not have enough memory available to store the code needed to
work with the given pattern (regular expression). The usual cause is that the
pattern is very complex. Make the pattern simpler, or try to release memory
so that grep has more space to work with.
The longest input record (line) is restricted by the system variable LINE_MAX. It is
always at least 2048 bytes. fgrep may be able to handle lines longer than
LINE_MAX. Longer lines are treated as two or more records.
grep
Chapter 2. Shell command descriptions 305