find positions of a letter in a text file

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1

Hi,

I would like to know how can I get all the positions of a letter, let say letter C in a text file.

sample input file:
hcck
pgog
hlhhc

desired output file:
2
3
13

Many thanks!

2 
awk -vFS= -vj=0 '{
 for(i=1;i<=NF;i++){
    j++;
    if($i~/[cC]/){
        print j 
    } 
    } 
}' file
3

Thanks for the fast reply. Since I am a UNIX newbie, can you write the full command?

Thanks again.

---------- Post updated at 11:48 AM ---------- Previous update was at 11:46 AM ----------

ok, nevermind. It worked perfectly. Many thanks!