Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place! |
Notices |
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
Are you new to LinuxQuestions.org? Visit the following links:
Site Howto |
Site FAQ |
Sitemap |
Register Now
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Get a virtual cloud desktop with the Linux distro that you want in less than five minutes with Shells! With over 10 pre-installed distros to choose from, the worry-free installation life is here! Whether you are a digital nomad or just looking for flexibility, Shells can put your Linux machine on the device that you want to use.
Exclusive for LQ members, get up to 45% off per month. Click here for more info.
|
|
11-30-2009, 07:43 AM
|
#1
|
Member
Registered: Aug 2009
Location: India
Distribution: open suse, fedora
Posts: 33
Rep:
|
how to remove words in a file using sed or any other command
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
Last edited by Kilam orez; 11-30-2009 at 07:44 AM.
|
|
|
11-30-2009, 08:26 AM
|
#2
|
LQ Guru
Registered: May 2005
Location: Atlanta Georgia USA
Distribution: Redhat (RHEL), CentOS, Fedora, CoreOS, Debian, FreeBSD, HP-UX, Solaris, SCO
Posts: 7,831
|
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.
|
11-30-2009, 08:31 AM
|
#3
|
LQ Veteran
Registered: Nov 2005
Location: Annapolis, MD
Distribution: Mint
Posts: 17,809
|
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:
Code:
sed 's/[[:alpha:] ]//g' inputfile > outputfile
(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
Last edited by pixellany; 11-30-2009 at 08:33 AM.
|
|
1 members found this post helpful.
|
11-30-2009, 08:43 AM
|
#4
|
Member
Registered: Jul 2005
Location: France
Distribution: Arch Linux
Posts: 540
Rep:
|
It seems easier with awk :
Code:
awk '{printf "%.2d %s\n",NR,$2}' datafile
01 0.003745
02 0.004549
03 0.001689
04 0.001673
05 0.001475
06 0.001931
07 0.002565
08 0.001327
|
|
1 members found this post helpful.
|
11-30-2009, 08:52 AM
|
#5
|
Senior Member
Registered: Aug 2006
Posts: 2,697
|
Code:
#!/bin/bash
read -p "Enter line number: " num
i=0
while read -r line
do
i=$((i+1))
if [ "$i" -eq "$num" ];then
line="${line//Max /}"
echo "${line/constrained/}"
fi
done <"file"
|
|
1 members found this post helpful.
|
All times are GMT -5. The time now is 04:08 PM.
|
LinuxQuestions.org is looking for people interested in writing
Editorials, Articles, Reviews, and more. If you'd like to contribute
content, let us know.
|
Latest Threads
LQ News
|
|