how to use basic linux command to count the number of dot in every line then insert the value in eac-CodePudding

I process a text file with many domain like abcd.efgh.ijkl.mnop I hope to add a 3 at the same line no matter how it is at the beginning or at the end.

current I use sed 's/[^.]//g' thetextfile | awk '{ print length }' > thenumber then I use librecalc to combine them.

Thank you very much.

CodePudding user response：

This should do it:

while read z;do echo $(echo "$z"|sed 's/[^\.]//g'|wc -m) $z;done < input.txt

which will produce:

3 abcd.efgh.ijkl.mnop
6 abcd.efgh.ijkl.mnop...
4 abcd.efgh.ijkl.mnop.

CodePudding user response：

Using a perl one-liner, taking advantage of tr returning the number of changes:

$ perl -ne 'print tr/././, " ", $_' input.txt
3 abcd.efgh.ijkl.mnop
6 abcd.efgh.ijkl.mnop...
4 abcd.efgh.ijkl.mnop.

CodePudding user response：

In plain bash, without using any external utility:

#!/bin/bash

while read -r line; do
    dots=${line//[^.]}
    printf '%d\t%s\n' ${#dots} "$line" 
done < file