topic Re: shell script - read doesn't work in Operating System - HP-UX

shell script - read doesn't work

andi_1 — Tue, 12 Mar 2002 16:11:45 GMT

Hi guys,

For some reason, this script doesn't stop at read to read user answer (Y/N) and for somehow N is always assumed!

sed "s/,/ /g" $1|while read line
do

LVSTRING="${LVCREATE} -i ${LVSTRIP}"

echo "\n Striping will be used"
echo " Number of spindles to be used is "
echo "\nWould you like to change the number of spindles (y/n)[n]: \c"
read ans
ans=$(echo $ans |tr "[a-z]" "[A-Z]")
if [ "$ans" = "Y" ]; then
echo "YES"
else
echo "NO"
fi
fi
done

Thank you.

Re: shell script - read doesn't work

Bill McNAMARA_1 — Tue, 12 Mar 2002 16:12:40 GMT

insert the line

#!/usr/bin/ksh

at the top of the script..

Later,
Bill

Re: shell script - read doesn't work

Bill McNAMARA_1 — Tue, 12 Mar 2002 16:14:42 GMT

kibo:root> /tmp/scr

Striping will be used
Number of spindles to be used is

Would you like to change the number of spindles (y/n)[n]: n
NO

Works for me:

kibo:root> cat /tmp/scr
echo "\n Striping will be used"
echo " Number of spindles to be used is "
echo "\nWould you like to change the number of spindles (y/n)[n]: \c"
read ans
ans=$(echo $ans |tr "[a-z]" "[A-Z]")
if [ "$ans" = "Y" ]; then
echo "YES"
else
echo "NO"
fi

Later,
Bill

Re: shell script - read doesn't work

andi_1 — Tue, 12 Mar 2002 16:15:05 GMT

I do have #!/bin/ksh

Re: shell script - read doesn't work

andi_1 — Tue, 12 Mar 2002 16:17:58 GMT

Bill,

If I remove while loop it works, but I need to have while loops since its in the while loop I read file and determine striping

I hope read can work in the while loop

Re: shell script - read doesn't work

Bill McNAMARA_1 — Tue, 12 Mar 2002 16:18:30 GMT

Watch out for your nested if
and multiple use of the same variable.

other than that, term emulation or env should be looked at.

Dis you try to add a set -x in the script.

Later,
Bill

Re: shell script - read doesn't work

Santosh Nair_1 — Tue, 12 Mar 2002 16:19:38 GMT

It looks like the line "read ans" is reading from your input file, i.e. from $1. Try redirecting stdin into the read, i.e:

the line:

read ans

become:

read ans <&1

Hope this helps.

-Santosh

Re: shell script - read doesn't work

Rodney Hills — Tue, 12 Mar 2002 16:20:07 GMT

It looks like your sed is piping its output to the while loop, so the "read ans" is picking up its data from whatever you pass as a file to sed.

-- Rod Hills

Re: shell script - read doesn't work

Rodney Hills — Tue, 12 Mar 2002 16:22:46 GMT

If you use

read -u3 ans

Then it will do it's input from STDERR and do a real input from the terminal, assuming you haven't redirected STDERR.

-- Rod Hills

Re: shell script - read doesn't work

Bill McNAMARA_1 — Tue, 12 Mar 2002 16:22:53 GMT

Would you like to change the number of spindles (y/n)[n]: n
NO
hello1111

Striping will be used
Number of spindles to be used is

Would you like to change the number of spindles (y/n)[n]: y
YES
hello111

Striping will be used
Number of spindles to be used is

Would you like to change the number of spindles (y/n)[n]: y
YES
hello11

where the script is:
for i in $(cat /tmp/file1)
do

echo "\n Striping will be used"
echo " Number of spindles to be used is "
echo "\nWould you like to change the number of spindles (y/n)[n]: \c"
read ans
ans=$(echo $ans |tr "[a-z]" "[A-Z]")
if [ "$ans" = "Y" ]; then
echo "YES"
else
echo "NO"
fi

echo $i

done

and the file1 is:

hello111111
hello11111
hello1111
hello111
hello11
~

Re: shell script - read doesn't work

Rodney Hills — Tue, 12 Mar 2002 16:24:14 GMT

oops, i meant

read -u2 ans

-- Rod Hills

Re: shell script - read doesn't work

Ian Dennison_1 — Tue, 12 Mar 2002 16:24:42 GMT

Try sticking the portion of code inside the loop in a function of its own, then calling the function from inside the loop. Be sure to export any variables that are passed between.

function prompt_user
{
print "Are you really really sure?"
read ans

export ans2=$ans
}

sed .... |while read line
do

prompt_user

/* Actions here */
done

Share and Enjoy! Ian