script help

[Khashru]

Hi,

I am using the following two lines in one of my script

Enter user name
read NAME

I want to stop entering null value. If someone enters enter without giving character then i want to echo a warning.

[Patrick Wallek · Accepted solution]

Something like this ought to work.....

if [[ ${NAME} = "" ]] ; then
echo "you must enter something"
fi

[Hein van den Heuvel]

How about:

/mnt/root # cat x
#!/bin/sh
a=""
while [ "${a}" = "" ]
do
echo -n "Please enter name : "
read a
done
echo "---> $a <----"


Please be sure to check some basic shell programming books of web pages.
Pretty much the very question you asked is answerred in one that popped up with google: +unix +sh +while:
http://steve-parker.org/sh/loops.shtml

hth,
Hein.

[Muthukumar_5]

Use as,

echo "Enter User Name"
read NAME

if [[ -z ${NAME} ]]
then
echo "User name is null. Enter it."
fi

[Arunvijai_4]

Enter user name
read NAME

while [ NAME = "" ]
do
echo -n "Its null, Enter a Name: "
read a
done

-Arun

[Arturo Galbiati]

Hi,
read NAME"?Enter user name "
if [[ -z $NAME ]] ; then
echo "you must enter something"
fi

HTH,
Art