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Top Forums Shell Programming and Scripting Difference between "?" and "*" Post 302213452 by Gaurang033 on Thursday 10th of July 2008 06:32:09 AM
Old 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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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)
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