Open System Services Shell and Utilities Reference Manual (G06.25+, H06.03+)

grep(1) OSS Shell and Utilities Reference Manual
7. To display all lines that contain uppercase characters, enter:
grep ’[[:upper:]]’ pgm.s
EXIT VALUES
The exit values of the grep command are as follows:
0 A match was found.
1 No match was found.
2 A syntax error was found or a file was inaccessible, even if matches were found.
RELATED INFORMATION
Commands: ed(1), sed(1), sh(1).
Files: locale(4).
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