Modified copies of line sed / awk
awk, bash, sed
Solution
sed -n ' p; s/^N:/FN:/p' original.txt
This produces:
random
N:John Doe
FN:John Doe
random
N:Jane Roe
FN:Jane Roe
random
random
N:Name Sirname
FN:Name Sirname
random
It works as follows. We invoke `sed -n` which means that, by default, it won't print any lines. Then, we give it two commands. The first, `p`, is to print the existing line unmodified. The second, `s/^N:/FN:/p`, tells it to try to substitute `FN:` for any leading `N:` and, if that substitute succeeds (meaning that the line actually did start with `N:`), then also print the modified version.
Problem
I'm trying to insert modified copies of lines after the original lines. Here's my file: ``` random N:John Doe random N:Jane Roe random random N:Name Sirname random ``` Here's what my file need needs to look like: ``` random N:John Doe FN:John Doe random N:Jane Roe FN:Jane Roe random random N:Name Sirname FN:Name Sirname random ``` Any ideas for this one? Can't seem to find the right sed/awk combination...