> I want to do a substitution using the (/s) command. But I am ONLY interested
> in substituting multiples of 100th line.
> In other words, I have a huge file (thousands of lines); and, I want to go
> through this file, and look for lines #100, #200, #300, #400, ... and append
> the word "checked" at the end of these line.
while others have suggested Vim solutions, if you have GNU sed,
this is pretty simple:
sed '100~100s/$/ (checked)/' <in.txt >out.txt
("starting at line 100, and every 100th line after that, perform
this substitute of the EOL with ' (checked)'" Note that this "~"
notation is a GNU extension to POSIX sed)
-tim
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