append delimeter count for each line in text file

Shell Programming and Scripting
1

Hi guys, plz tell me how to achieve this
how to delete the lines in a file using sed command

2 
awk -F"|" '{$0="delcnt"NF-1"|"$0}1' input > output && mv output input
3

Thanks , can you plz tell me how to achieve using sed command , bcoz as i dont have permissions to create a output file . all the edit/change operations should be performed on the input file itself.

4

If your sed supports -i option, you can edit the file in place:

       -i[SUFFIX], --in-place[=SUFFIX]
              edit files in place (makes backup if extension supplied)
5 
{ rm input; awk -F"|" '{$0="delcnt"NF-1"|"$0}1'  > input; } < input

:wink:

1 Like
6

What a great way of handling a file!
It does works, but I am really puzzled how shell deals with file handlers, so rm deletes the file, but it somehow exists for the awk process? It would be very interesting if someone can explain

7

perfect.