position of character in a line

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# 1  
Old 07-07-2011
position of character in a line

i want to find the position of a character in a line , the first position, last, 5th occurence position , i ve tried grep -n , and expr index but they dont fit the bill. Please let me know if there is any other alternative
# 2  
Old 07-07-2011
#!/usr/bin/awk -f
        for (offset = c =0; i = index(substr($0, offset + 1), "s"); offset += i){
                if ((c == 1) || (c == 5))
                        print "Occurence " c " @ " offset + i;
        if ((c != 1) && (c != 5))
                print "Last occurence @ " offset + i

[mute@geek ~]$ echo mississippis | ./offset
Occurence 1 @ 3
Occurence 5 @ 12
[mute@geek ~]$ echo mississippi | ./offset
Occurence 1 @ 3
Last occurence @ 7

# 3  
Old 07-07-2011
Here is one way of doing it:
echo 'M2011-07-0603:53:23M0ISETM' | fold -w1 |  egrep -n 'M'

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