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Full Discussion: Date & NUmber Validation Query
Top Forums Shell Programming and Scripting Date & NUmber Validation Query Post 59969 by zazzybob on Wednesday 5th of January 2005 06:06:58 PM
Old 01-05-2005
Don't worry about damaging /dev/null - unless you're logged in as root and issue rm /dev/null nothing bad will happen!

The > redirection operator will erase anything in a file before outputting to it - use >> if you want to append.

If you want to change the format to delimit the date components with "-" just change the command to

echo "12-31-2004" | grep '^[0-1][0-9]-[0-3][0-9]-[0-9]\{4\}$' > myfile # or wherever

If you had the date in a variable, say DATE, then you can check the format of DATE with

Code:
echo "$DATE" | grep '^[0-1][0-9]-[0-3][0-9]-[0-9]\{4\}$' > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
   echo "Date correctly formatted"
else
   echo "Date incorrectly formatted"
fi

If you have a something along the lines of
Code:
DATE="12/31/2004"

and you want to change the format, try
Code:
echo "$DATE" | grep '^[0-1][0-9]/[0-3][0-9]/[0-9]\{4\}$' > /dev/null 2>&1
if [ "$?" -eq "0" ]; then
   echo "Date correctly formatted"
   echo "$DATE" | tr '/' '-'
else
   echo "Date incorrectly formatted"
fi

And the "/" will be substituted for "-"

If this isn't what you want please post exact requirements.

Cheers
ZB
 

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mdoc-validate(1)					      General Commands Manual						  mdoc-validate(1)

NAME

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SYNOPSIS

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DESCRIPTION

       mdoc validate validates the specified PATHS against a specified format schema.

OPTIONS

       --format=FORMAT
	      The documentation format to validate PATHS against.  Supported formats include: ecma.

	      See the FORMATS section below for more information about these formats.

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       -h, -?, --help
	      Display a help message and exit.

FORMATS

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