Grep log file

Grep the log file for commands

First we find which commands relax has performed, and separate into the different fitting models

egrep -wi --color 'relax>| model -' LOGFILE.txt > greplogfile.txt

Then we replace instances of relax> with empty, and comment out the model line

sed -i "s/relax> //" greplogfile.txt ;
sed -i 's/^- /#- /' greplogfile.txt ;

See also

Sed one-liners