hi dear all,

i want to remove words "Max" and "constrained" in a file given below:

Max 0.003745 constrained
Max 0.004549 constrained
Max 0.001689 constrained
Max 0.001673 constrained
Max 0.001475 constrained
Max 0.001931 constrained
Max 0.002565 constrained
Max 0.001327 constrained

and further want to replace "Max" by line number so that i can plot the resulting file.

i searched in forum, but couldn't do what i wanted to do.

e.g. i used

1)grep command

grep -v "Max" inputfile >outputfile

deletes whole line,and hence whole text.

2) sed command

cat inputfile |sed 's/ .\{1,12\} //g' >outputfile

gives output

0.003745constrained
0.004549constrained
0.001689constrained
0.001673constrained
0.001475constrained
0.001931constrained
0.002565constrained
0.001327constrained

can anybody help me out?

regards

kilam

grep -n [a-z] <FILE> |sed 's/:Max//' |sed 's/constrained//'

Where <FILE> is the file that contains the original text.

The -n tells grep to add line numbers. The [a-z] just says to find any line that has one of those characters (which should be every line if they all contain Max and constrained - you could just do "grep -n M").

The line number has a colon added after it and before the original text so the first sed gets rid of the colon and the "Max". The second sed gets rid of the "constrained".

Probably a cleaner one liner could be done but that one will work.

1 members found this post helpful.

Your sed syntax says: "replace every instance of 1-12 characters, followed by a space". I don't get the same results on my system.

How about this:

(Note that "cat" is not required.)(replaces all letters or spaces)

sed can also number the lines, but you need an extra command to get the line numbers on the same line.

Really good SED tutorial:
http://www.grymoire.com/Unix/Sed.html

1 members found this post helpful.

It seems easier with awk :

1 members found this post helpful.

1 members found this post helpful.