Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Removing text from a line in a file

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Removing text from a line in a file
# 1  
Old 02-04-2008
Error Removing text from a line in a file
Hi All,

I would like to know how to remove text from a line in a file.

eg

[na *oparea* check 0 nul 6376000 nlr 6374000 eul 318000 elr 320000]

to

[na *oparea* check 0]

The 4 sets of numbers are not static ie they change on each line in each different file so if anyone can help that would be great.

Jeremy
# 2  
Old 02-05-2008
awk '{print $1,$2,$3,$4"]"}' inputfilename > outputfilename
Last edited by H2OBoodle; 02-05-2008 at 12:36 AM.. Reason: Removed the "," after the 4 to avoid the space being added.
# 3  
Old 02-05-2008
try this Perl one liner:
Code:
perl -pi -e 's/(\[na\s+\*oparea\*\s+check\s+\d+)\s+nul\s+\d+\s+nlr\s+\d+\s+eul\s+\d+\s+elr\s+\d+\]/\1]/' newfile

# 4  
Old 02-05-2008
Hopefully the entire line does not have to matched and a shorter regexp will suffice:

perl -pi -e 's/^(\Q[na *oparea* check \E\d+).*/$1]/' file

The only advantage is a more readable code. The disadvantage is false matches are possible if the entire line needs to be matched
# 5  
Old 02-12-2008
removing text
perl -pi -e 's/^(\Q[na *oparea* check \E\d+).*/$1]/' file

perl -pi -e 's/(\[na\s+\*oparea\*\s+check\s+\d+)\s+nul\s+\d+\s+nlr\s+\d+\s+eul\s+\d+\s+elr\s+\d+\]/\1]/' newfile

I have tried both of these lines, but they just make the output file empty
# 6  
Old 02-12-2008
don't have to use regular expression. Unless i read your requirement wrong,
Code:
open(F, "<file") or die "cannot open file:$!\n";
while ( <F> ) {
 if ( /nul/ ) {
  @a = split(/nul/);
  print $a[0] . "]\n";
 } 
}
close(F);

output:
Code:
# ./test.pl
[na *oparea* check 0 ]

# 7  
Old 02-12-2008
reply
open(F, "<file") or die "cannot open file:$!\n";
while ( <F> ) {
if ( /nul/ ) {
@a = split(/nul/);
print $a[0] . "]\n";
}
}
close(F);

can you please explain this line by line for me.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Removing \n from a text file

Hi All, I have a question regarding text substitution. I have a file that contains a lot of text. Some of the text is separated with a \n like: TEST\nTEST2\nTEST3 BLA\nBLA2\nBLA3 So there are both actual newlines and 'used to be newlines' in the text. using tr tr "\n" "," or... (5 Replies)
Discussion started by: JaapSchuurman
5 Replies

2. UNIX for Dummies Questions & Answers

Removing PATTERN from txt without removing lines and general text formatting

Hi Everybody! First post! Totally noobie. I'm using the terminal to read a poorly formatted book. The text file contains, in the middle of paragraphs, hyphenation to split words that are supposed to be on multiple pages. It looks ve -- ry much like this. I was hoping to use grep -v " -- "... (5 Replies)
Discussion started by: AxeHandle
5 Replies

3. Windows & DOS: Issues & Discussions

Removing anything from text file except specific string

So, I have a text file that looks like this: 0,0: (168,168,176) #A8A8B0 srgb(168,168,176) 1,0: (168,168,176) #A8A8B0 srgb(168,168,176) 2,0: (166,166,174) #A6A6AE srgb(166,166,174) 3,0: (166,166,174) #A6A6AE srgb(166,166,174) 4,0: (168,168,176) #A8A8B0 srgb(168,168,176) 5,0:... (0 Replies)
Discussion started by: pasc
0 Replies

4. Shell Programming and Scripting

Removing zero values from text file

Hi all, I wrote the following code to remove the value which are 0 in the input file (a columns if numbers). awk 'BEGIN { for (i=1; i<=NF; i++) if ($i) printf("%13.6e\n",$i) }' $1 >> $2 The script works if the zeros are written as 0.0000 but not as 0.000000e+00 In... (10 Replies)
Discussion started by: f_o_555
10 Replies

5. Shell Programming and Scripting

Help with removing line from text

Hey everyone, I kinda new to shell programming and learning bits and pieces of stuff from tutorials. I got this problem, where I asked my user to enter a string, which will delete a specific line in the string, which I'm unable to do it. Text file(BookDB.txt) as shown: Three Little... (4 Replies)
Discussion started by: aLHaNz
4 Replies

6. UNIX for Dummies Questions & Answers

Removing a string of text from a file - help please

Hey Folks, I have a file that contains data that I am working with, sometimes this file has a very long string of text that messes with an awk command in a script i am trying to build. I would like to cut this string of text out of a file and then redirect everything except that string to a new... (5 Replies)
Discussion started by: deepslp
5 Replies

7. Shell Programming and Scripting

Sed question (Removing a line of text)

I am working with bash on HP-UX server at school. As practice for scripting, I am trying to make a pretend server admin script that adds a user to the system, deletes a user from the system, and lists all users of the pretend system. I have accomplished this with a select loop. Adding users, and... (2 Replies)
Discussion started by: masterscout1977
2 Replies

8. Shell Programming and Scripting

Removing a particular line from a text file

Hi, I have a file called inp.txt the contents of the file are as follows MANI123|23|41 MANI123|96|23 I want to reove the first line of this file. How can I do it. Thanks in advance (5 Replies)
Discussion started by: sendhilmani123
5 Replies

9. Shell Programming and Scripting

Removing lines in a text file.

Here is my problem I'm hoping you guru's can help me figure out. I have a text file that contains comma delimited columns. What I'm looking to do is see if the 24th column on each row in the file contains a value (not null), and then write/append that line to a different file. I've been... (4 Replies)
Discussion started by: WABonnett
4 Replies

10. UNIX for Dummies Questions & Answers

removing commas from text file

Dear all I have a file which looks like this xxxxxxxxxxxxxx,xxx,xxxxxxxxxx xxxxxxxxxxxxxx,xxx,xxxxxxxxxx etc basically 14 characters then a comma, three characters, then a comma then 10 characters. We are uploading this file to our mainframe and they want the commas removed, so it... (6 Replies)
Discussion started by: hcclnoodles
6 Replies
Login or Register to Ask a Question