Shell Programming and Scripting

You have variables val and num, both being assigned values from prior portions of your script. Now you want to read sth., and either keep the before-assigned value, when the user just presses <enter>, or assign your variable a new value. Do so reading into a third, temporary variable like tmp, and don't touch val or num if tmp is empty. This is what I posted in #4, put in plain english.

Do

Code:

echo "Enter Value : \c" ; read val
echo "Enter number: $val\c" ; read num
if [ "$num""X" = "X" ]; then  # or use: if [ -z "$tmp" ];... if possible
  num="$val"
fi
echo $val
echo $num

I tried with the script as you suggested..
Enter Value : 12
Enter number: 12
val: 12, num:

For the 2nd argument I just press the enter but null value has been passed.

Actually earlier I wanted to re-use the same value but later the request has been changed that's why I asked you for that to either re-use or edit the value.

Thanks.

---------- Post updated at 09:29 PM ---------- Previous update was at 09:18 PM ----------

Hi 244an

Thanks for your time and reply.

I tried with the script as you suggested but I am not able to edit value for 2nd argument. Please see the output.

Enter Value : 12
Enter number: 1234
12
34
After change it to another condition as suggested by you... and the output was

Enter Value : 12
Enter number: 1234
12
12

Thanks.

---------- Post updated 19-09-12 at 04:03 PM ---------- Previous update was 18-09-12 at 09:29 PM ----------

Anyone there to help me out. Thanks.

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The UNIX and Linux Forums.

What you exact want...?

give some the details..

for inputs what your output should be..

Code:

val="" and val=25#any number
num="" and num=14#any number

# for above inputs, combine those inputs and give your desired output

Hi Pamu

Thanks for you reply.

Here is my requirement.

echo "Enter Serial Number :\c" ; read SNO
echo "Enter Value :\c" ; read VAL

There are 2 types of condition
1. If I want to use the same number for variable VAL (reuse the value of SNO) so it will display there like
echo "Enter Value : $SNO \c" ; read VAL
2. If I want to enter new number (VAL), so in this case need to remove the displayed value from there and enter new number.

Thanks.

You want to display this....

Code:

Enter Value : $SNO \c  # if you want to use same number
and
Enter Value :  \c # If you want to use new number

Let me know if i m incorrect..?