On 06/06/2015 03:21 AM, Nicolas Thierry-Mieg wrote: >>> perl -pi -e 's:^#!/usr/bin/r:#!/usr/bin/R: unless $i++' >>> path/to/R/scripts/*.R >> >> I assume the "unless $i++" is supposed to limit the replace operation to >> only the first line each file. Unfortunately, since it is a global >> variable, it is actually limiting it to only the first line of the first >> file. Yeah, it was untested code off the top of my head and you are correct. > just replace it everywhere, /usr/bin/r doesn't exist anyways, but make > sure there's nothing after the r: > perl -pi -e 's:^#!/usr/bin/r\s*$:#!/usr/bin/R:' whatever/*.R This should work. Peter