I like to know how to remove '$' from a $ variable.

I create a script, a.sh as below:

#!/usr/bin/ksh
a=`echo $1 | cut -d"\$" -f1`
b=`echo $1 | cut -d"\$" -f2`
echo $a$b

However, this script does not work as I expect

For example when I run the script as below:

a.sh abc$def.

The script displays 'abcabc' instead
of 'abcdef'

Parameter $1 has value the "abc" and not "abc$def"; at the command line the $def substring is interpreted as a variable.

Calling
a.sh 'abc$def'
or
a.sh abc\$def
should output "abcdef".