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Oh I see the problem. $1 and $2 are local to functions but you are not passing parameters to the function. Perhaps define a and b outside of the functions, e.g...$ cat sh.1
menu ()
{
echo...

Hi

Just initialize the sum variable:

a=$1
count=1
sum=0

until [ $sum -ge 30 ]
do
sum=`expr $a \* $count`
echo " $1 * $count = $sum"
let count=count+1
done

Guru.

Hi


a=$1
count=1


until [ $sum -ge 30 ]
do
sum=`expr $a \* $count`
echo " $1 * $count = $sum"
let count=count+1
done

Guru.

I think what you want is:
sed '/dan/ s/1000/1500/'

This will do the substitution only on the lines that match 'dan'.
Note that if a line contains "Maydan" or something, it will change this...

First: if your input file and output file are the same than sed will destroy the file. Use a different file for output.

Second: have a look at the man page for sed, about line ranges. You also...

Can you pls post some input that support your requirement and desired output.

Try backticks:
a=`cut -f2 money`
or this:
a=$(cut -f2 money)

If the result of the cut is more than 1 value, you want to surround both lines of code with doubel quotes like:
a="$(cut -f2 money)"