Shell Programming and Scripting

$ ./neruppu
Please enter a name : []
Please enter a name : []
Please enter a name : []
Please enter a name : []
Please enter a name : []
Please enter a name : []
Please enter a name : []
...

$ cat mess
#! /usr/bin/ksh

all_OMC=0
EA_run_file=data
while [ -z "$ea_ident" -o -n "`grep 2>/dev/null \"^EA $ea_ident$\" $EA_run_file`" ] ; do

        if [ $all_OMC -ne 1 ] ; then
                printf "Please enter a name : [${omc_ident}] "
                read response # the problem occur here

                if [ -z "$response" ] ; then
                        ea_ident=${omc_ident}
                else
                        #
                        # Check that name does not contain invalid characters
                        #
                        ea_ident=`echo $response | tr -d "/ \011"`

                        if [ -z "${ea_ident}" -o "${ea_ident}" != "${response}" ] ; then
                                echo
                                echo "Sorry, not a valid name!"
                                echo "Must not contain spaces, tabs or '/'."
                                echo
                                ea_ident=
                        fi
                fi
        else
                ea_ident=${omc_ident}
        fi


        if [ -n "`grep 2>/dev/null \"EA $ea_ident$\" $EA_run_file`" ] ;  then
                echo "That name is already in use."
        fi

done
$ ./mess
Please enter a name : [] it is pausing for me!

Sorry, not a valid name!
Must not contain spaces, tabs or '/'.

Please enter a name : [] kjhkjhkjhkjh
$