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even this doesnot work...i had previously written similarly..it doesnot work...

This code doesnot work...itz giving me the following error..
STRING="aaa;bbb;ccc"
SUBSTRING=';'
last_position=$(echo "$STRING" | awk -v str=$SUBSTRING '
{
while (match(substr($0, pos+1),...

hii,
i want to know the shell command for finding the last occurance of a substring in string..
i can use grep command or sed to find out the occurance of a substring in a string but how do i find...

hiii
i need help with the string operations.i need to know how do we..
1.Copy a string s1 to string s0, then append string s2 to it.

2.Replace all occurrences of substring s2 with another...