02-19-2008
Quote:
Originally Posted by
gneen
Heh - the grep inside the read loop would "work" ... but I'd have to come back in a year to see the results!
For tiny files this would clearly be the way to go - but for files the size I'm dealing with this would mean one million greps into a file that was ten million lines long ... can you spell "Rip Van Winkle"?
=Gneen
So, I made a 1M line file and 10M line file to test on... running the grep loop on a pretty beefy server (dual 2.8ghz intel xeons) and it took 170m ... so, not forever but definitely not as fast as you'd want.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I need help to parse a file where there are many records, all of which are consistently separated by lines containing “^=============” and "^ End of Report".
Example:
=============
1
2
3
4
End of record
=============
1
3
4
End of record
Etc....
I only need specific lines... (5 Replies)
Discussion started by: jouuu
5 Replies
2. Shell Programming and Scripting
Hi,
I have two files. 1st file has 1 column (huge file containing ~19200000 lines) and 2nd file has 2 columns (small file containing ~6000 lines).
#################################
huge_file.txt
a
a
ab
b
##################################
small_file.txt
a 1.5
b 2.5
ab ... (4 Replies)
Discussion started by: AshwaniSharma09
4 Replies
3. Shell Programming and Scripting
hi,
i have two files.
file1.sh
echo "unix"
echo "linux"
file2.sh
echo "unix linux forums"
now the output i need is
$./file2.sh
unix linux forums (3 Replies)
Discussion started by: snreddy_gopu
3 Replies
4. Shell Programming and Scripting
I have a configuration file that contains hundreds of these chunks. Each "chunk" is the section that begins with "define service {" and ends with "}".
define service {
check_command check_proc!java
hostgroup_name
service_description ... (5 Replies)
Discussion started by: SkySmart
5 Replies
5. Shell Programming and Scripting
I have a file that looks like this:
cat includes
CORP-CRASHTEST-BU
e:\crashplan\
CORP-TEST
/usr/openv/java
/usr/openv/logs
/usr/openv/man
CORP-LABS_TEST
/usr/openv/java
/usr/openv/logs
/usr/openv/man
What I want to do is make three new files with just those selections. So the three... (4 Replies)
Discussion started by: newbie2010
4 Replies
6. Shell Programming and Scripting
I really can't figure this one out.
I have 2 files, one file is a list of hostnames and the other is a list of their corresponding IPs:
fileA:
example.com
another.org
thirdie.net
fileB:
1.1.1.1
2.2.2.2
3.3.3.3
I want to create a fileC that looks like:
example.com 1.1.1.1... (2 Replies)
Discussion started by: zstar
2 Replies
7. UNIX for Dummies Questions & Answers
Hello All,
this is my first post so I don't know if I am doing this right.
I would like to append entries from a series of strings (contained in a text file) consecutively at the end of specifically labeled lines in another file.
As an example:
- the file that contains the values to be... (3 Replies)
Discussion started by: gus74
3 Replies
8. Shell Programming and Scripting
I have a bunch of file numbers in the file 'test':
I'm trying the above command to change all the instances of "H" to "Na+" in the file testsds.pdb at the line numbers indicated in the file 'test'. I've tried the following and various similar alternatives but nothing is working:
cat test |... (3 Replies)
Discussion started by: crunchgargoyle
3 Replies
9. Shell Programming and Scripting
HI,
I have 2 text files. file1 and file2.
file1.txt (There are no duplicates in this file)
1234
3232
4343
3435
6564
6767
1213
file2.txt
1234,wq,wewe,qwqw
1234,as,dfdf,dfdf
4343,asas,sdds,dsds
6767,asas,fdfd,fdffd
I need to search each number in file1.txt in file2.txt's 1st... (6 Replies)
Discussion started by: Little
6 Replies
10. Shell Programming and Scripting
I have a file where every line includes four expressions with a caret in the middle (plus some other "words" or fields, always separated by spaces). I would like to extract from this file, all those lines such that each of the four expressions containing a caret appears in at least four different... (9 Replies)
Discussion started by: uncleMonty
9 Replies