validate the file name

Shell Programming and Scripting
1

write a shell script that check file name like pstat_24.txt (up to 5 digits)
i mean to say this digit can be range from 1 to 99999 only

correct file name are

pstat_10000.txt
pstat_12345.txt
pstat_14569.txt

wrong file name are

pstat_1234567.txt
pstat_1a2345.txt
pstat_1ss123.txt

Thanks
Mayank

2

pls make sure that you read the rules first.

pls elaborate on the problems you're having so that we all can be of help.

3

From what I could understand, this should do it.

#! /bin/sh

FILE="pstat_24.txt"
FILE=${FILE%.txt}
NUM=${FILE##*_}
if [[ $NUM = *[a-zA-Z]* ]] ; then
echo "Not A Valid Name"
elif [ $NUM -gt 1 -a $NUM -lt 100000 ] ; then
echo "Name is good"
else
echo "Bad choice for a name"
fi

Tested for

FILE="pstat_24.txt"
FILE="dadasd_342f.txt"
FILE="dadasd_34223434.txt"
FILE="dadasd_0.txt"
FILE="dadasd.txt"

Vino