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Full Discussion: Validation help
Top Forums Shell Programming and Scripting Validation help Post 302455450 by zen10 on Tuesday 21st of September 2010 03:37:42 PM
Old 09-21-2010
Validation help
Hi,

I am new to Unix shell scripting and need help to add some validation to an existing script.

I've made a script that takes two argument (input) but I want the script to display an error message when nothing (null) is entered. So far I managed to validate the fist argument but fail to validate the second input.

I have this so far

Code:
if [ $# -eq 0 ]
then
echo "run the script again and pass in a value"
exit 0
fi

Many Thanks
 

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LEARN ABOUT SUSE

truncate

TRUNCATE(1)							   User Commands						       TRUNCATE(1)

NAME

       truncate - shrink or extend the size of a file to the specifed size

SYNOPSIS

       truncate OPTION... FILE...

DESCRIPTION

       Shrink or extend the size of each FILE to the specified size

       A FILE argument that does not exist is created.

       If  a  FILE  is	larger than the specified size, the extra data is lost.  If a FILE is shorter, it is extended and the extended part (hole)
       reads as zero bytes.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --no-create
	      do not create any files

       -o, --io-blocks
	      Treat SIZE as number of IO blocks instead of bytes

       -r, --reference=FILE
	      use this FILE's size

       -s, --size=SIZE
	      use this SIZE

       --help display this help and exit

       --version
	      output version information and exit

       SIZE is a number which may be followed by one of the following suffixes: KB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P,
       E, Z, Y.

       SIZE  may also be prefixed by one of the following modifying characters: `+' extend by, `-' reduce by, `<' at most, `>' at least, `/' round
       down to multiple of, `%' round up to multiple of.

       Note that the -r and -s options are mutually exclusive.

AUTHOR

       Written by Padraig Brady.

REPORTING BUGS

       Report truncate bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       dd(1), truncate(2), ftruncate(2)

       The full documentation for truncate is maintained as a Texinfo manual.  If the info and truncate programs are properly  installed  at  your
       site, the command

	      info coreutils 'truncate invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010							       TRUNCATE(1)
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