Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Using grep to extract line number
Top Forums Shell Programming and Scripting Using grep to extract line number Post 66989 by reborg on Saturday 19th of March 2005 06:07:19 PM
Old 03-19-2005
Quote:
Originally Posted by mskarica
Thanks. That worked exactly how I needed it to. If you don't mind, can you explain what this means for me so I know in the future:

's/^\([0-9]*\)[:].*/ \ 1/p'

Thanks a lot.
You'll need to read up on regular expressions to really make much use of it, but here it is anyway:

The -n means not to print anything unless it's explicitly requested.

s - substitute
/ - beginning of patter to match
^ - The null character at the start of the line
\(....\) - store this in the pattern buffer
[0-9]* - match any number of occurrences numbers in the range 0-9
[:] - match the ":" character
.* - match any number of any characters (the rest of the line)
/ - end on the match patter and beginning on the replace pattern
\1 - the first entry in the pattern buffer ( what was stored with \(...\) )
/ - end of the replace pattern
p - print
This User Gave Thanks to reborg For This Post:
figaro
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

is there any why to get the number of line in grep result ?

Hello all when I do simple grep on file im getting the results of "filename : stringResult " is there any way to present also the line number in the file ? (1 Reply)
Discussion started by: umen
1 Replies

2. UNIX for Dummies Questions & Answers

Get Filename and Line Number using grep

Hi, I am using the Korne shell to try and get the filename, line number and the line of text using grep e.g. find ./ -type f -name "*.java" -exec grep -nf test.txt '{}' \; (test.txt contains strings to search) will return the line number and the line of text. grep -l would return the... (4 Replies)
Discussion started by: ceemh3
4 Replies

3. Shell Programming and Scripting

Grep a number from a line in ksh

In file.name, I have a line that reads $IDIR/imgen -usemonths -dropcheck -monitor -sizelimit 80000000 -interval 120 -volcal HSI How can I get the size limit, i.e. 80000000 out and pass it to a variable called SIZE? Thanks. I tried echo "grep sizelimit file.name" | sed -n -e... (3 Replies)
Discussion started by: rodluo
3 Replies

4. Shell Programming and Scripting

Extract a line from a file using the line number

I have a shell script and want to assign a value to a variable. The value is the line exctrated from a file using the line number. The line number it is not fix, and could change any time. I have tried sed, awk, head .. See my script # Get randome line number from the file #selectedline = `awk... (1 Reply)
Discussion started by: zambo
1 Replies

5. Shell Programming and Scripting

extract a line from a file using the line number

Hello, I am having trouble extracting a specific line from a file when the line number is known. My first attempt involved grep -n 'hi' (the word 'hi will always be there) to get the line number before the line that I actually want (line 4). Extra Notes: -I am working in a bash script. -The... (7 Replies)
Discussion started by: grandtheftander
7 Replies

6. UNIX for Dummies Questions & Answers

Using GREP/AWK to extract a number and store it as a variable

Hello, I have a question regarding the awk command. Here is the line I need to grep: 1 F= -.13250138E+03 E0= -.13249556E+03 d E =-.174650E-01 mag= 35.2157 Instead of displaying the number in red I would like to store it as a variable such as X. Is there a way to do this? Thanks for any... (3 Replies)
Discussion started by: modey3
3 Replies

7. Shell Programming and Scripting

extract the lines between specific line number from a text file

Hi I want to extract certain text between two line numbers like 23234234324 and 54446655567567 How do I do this with a simple sed or awk command? Thank you. ---------- Post updated at 06:16 PM ---------- Previous update was at 05:55 PM ---------- found it: sed -n '#1,#2p'... (1 Reply)
Discussion started by: return_user
1 Replies

8. Shell Programming and Scripting

Extract string from multiple file based on line count number

Hi, I search all forum, but I can not find solutions of my problem :( I have multiple files (5000 files), inside there is this data : FILE 1: 1195.921 -898.995 0.750312E-02-0.497526E-02 0.195382E-05 0.609417E-05 -2021.287 1305.479-0.819754E-02 0.107572E-01 0.313018E-05 0.885066E-05 ... (15 Replies)
Discussion started by: guns
15 Replies

9. Shell Programming and Scripting

extract a line from a file by line number

Hi guys, does anyone know how to extract(grep) a line from the file, if I know the line number? Thanks a lot. (9 Replies)
Discussion started by: aoussenko
9 Replies

10. Shell Programming and Scripting

Retrieving line number from grep

Hi. im trying to retrieve the line number from grep. i have 1 part of my code here. grep -n $tgt file.txt | cut -f 1 -d ":" when i do not cut the value i have is 12:aaa:abc:aaa:aaa:aaa how can i store the value of 12 or my whole line of string into a variable with grep? (6 Replies)
Discussion started by: One_2_three
6 Replies

LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
All times are GMT -4. The time now is 07:30 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy