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Full Discussion: How to check the user input to be valid using shell script?
Top Forums Shell Programming and Scripting How to check the user input to be valid using shell script? Post 302774443 by bakunin on Friday 1st of March 2013 11:22:19 PM
Old 03-02-2013
First, your input (obviously a filemode mask) has more structure: the "r" can only appear in the 1nd, 4th or 7th place, the "w" can only appear in the 2rd, 5th or 8th place, etc.

Construct a regular expression for this and compare the input string against this regexp:

Code:
typeset input=""

print - "Enter input string: " ; read input
if print - "$input" | grep -q '^[-r][-w][-x][-r][-w][-x][-r][-w][-x]$' ; then
     print - "input: $input \tstatus: OK"
else
     print - "input: $input \tstatus: Not OK"
fi

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
hyeewang
 

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LEARN ABOUT OSX

pod2usage

POD2USAGE(1)						 Perl Programmers Reference Guide					      POD2USAGE(1)

NAME

       pod2usage - print usage messages from embedded pod docs in files

SYNOPSIS

       pod2usage   [-help] [-man] [-exit exitval] [-output outfile] [-verbose level] [-pathlist dirlist] file

OPTIONS AND ARGUMENTS

       -help   Print a brief help message and exit.

       -man    Print this command's manual page and exit.

       -exit exitval
	       The exit status value to return.

       -output outfile
	       The output file to print to. If the special names "-" or ">&1" or ">&STDOUT" are used then standard output is used. If ">&2" or
	       ">&STDERR" is used then standard error is used.

       -verbose level
	       The desired level of verbosity to use:

		   1 : print SYNOPSIS only
		   2 : print SYNOPSIS sections and any OPTIONS/ARGUMENTS sections
		   3 : print the entire manpage (similar to running pod2text)

       -pathlist dirlist
	       Specifies one or more directories to search for the input file if it was not supplied with an absolute path. Each directory path in
	       the given list should be separated by a ':' on Unix (';' on MSWin32 and DOS).

       file    The pathname of a file containing pod documentation to be output in usage message format (defaults to standard input).

DESCRIPTION

       pod2usage will read the given input file looking for pod documentation and will print the corresponding usage message.  If no input file is
       specified then standard input is read.

       pod2usage invokes the pod2usage() function in the Pod::Usage module. Please see "pod2usage()" in Pod::Usage.

SEE ALSO

       Pod::Usage, pod2text(1)

AUTHOR

       Please report bugs using <http://rt.cpan.org>.

       Brad Appleton <bradapp@enteract.com>

       Based on code for pod2text(1) written by Tom Christiansen <tchrist@mox.perl.com>

perl v5.16.2							    2013-08-25							      POD2USAGE(1)
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