07-10-2008
Quote:
Originally Posted by
fpmurphy
Thus "a?" implies 0 or 1 matches of "a" and "a*" implies 0 or more matches of "a".
That's what i am asking. I know "a?" means 0 or 1 occurrence of preceding pattern. I was thinking it as exactly 0 or 1 occurrence. but it's not like that. I am not getting the difference between "*" and "?" . If there is any can you give me some example of it.
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LEARN ABOUT OPENSOLARIS
what
what(1) User Commands what(1)
NAME
what - extract SCCS version information from a file
SYNOPSIS
what [-s] filename...
DESCRIPTION
The what utility searches each filename for occurrences of the pattern @(#) that the SCCS get command (see sccs-get(1)) substitutes for the
@(#) ID keyword, and prints what follows up to a ", >, NEWLINE, , or NULL character.
OPTIONS
The following option is supported:
-s Stops after the first occurrence of the pattern.
EXAMPLES
Example 1 Extracting SCCS version information
If a C program in file program.c contains
char sccsid[] = "@(#)identification information";
and program.c is compiled to yield program.o and a.out, the command:
example% what program.c program.o a.out
produces:
program.c: identification information
program.o: identification information
a.out: identification information
EXIT STATUS
The following exit values are returned:
0 Any matches were found.
1 No matches found.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of what: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWsprot |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
sccs(1), sccs-admin(1), sccs-cdc(1), sccs-comb(1), sccs-delta(1), sccs-get(1), sccs-help(1), sccs-prs(1), sccs-prt(1), sccs-rmdel(1), sccs-
sact(1), sccs-sccsdiff(1), sccs-unget(1), sccs-val(1), sccsfile(4), attributes(5), environ(5), standards(5)
DIAGNOSTICS
Use the SCCS help command for explanations (see sccs-help(1)).
BUGS
There is a remote possibility that a spurious occurrence of the `@(#)' pattern could be found by what.
SunOS 5.11 30 Sep 2002 what(1)