Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

grep where expressions reside in file

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers grep where expressions reside in file
# 1  
Old 03-08-2005
grep where expressions reside in file
I have a program that displays many messages on stdout.
I have another file that contain error messages only - Each line is a separate message. (msgs.txt)

I am trying to show only the errors and not all the output.

I tried this but got nothing:

myprog | grep < msgs.txt

I also tried this

myprog | grep < `cat msgs.txt`

but both did not work....

Any suggestions?

Thanks a lot
Smilie
# 2  
Old 03-08-2005
myprog | grep -f msgs.txt
# 3  
Old 03-08-2005
I found that when I use -f alone grep displays all the input file and that -wf works well.

Thanks for your help.
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

grep and regular expressions

Hi All, For the past many days I have solved a lot of grep and regular expression questions, Now I am in a search for a good quality set of questions that can help me build and check my knowledge of grep with regular expressions, it would be great if anyone could help me with my requirement. ... (1 Reply)
Discussion started by: rahulkalra9
1 Replies

2. Homework & Coursework Questions

Regular Expressions with GREP

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: Given a text file (big_english.txt) containing roughly 250,000 words, answer the following using grep and... (2 Replies)
Discussion started by: blahblahblah123
2 Replies

3. UNIX for Dummies Questions & Answers

extract columns using grep or regular expressions

I am trying to print columns from a table whose name (header) matches a certain string. E.g., patient1001 patient1002 patient2005 patient3005 patient4001 0 0 0 0 0 2 9 2 8 3 2 7 3 0 2 Say I want to print columns whose names end with "01" patient1001 patient4001 0 0 2 3 2 2 ... (3 Replies)
Discussion started by: quextil
3 Replies

4. Homework & Coursework Questions

Grep expressions homework, need assistance

Please dont delete, im listing my assignment and will be editing as i work on it. I am NOT looking for answers but help in understanding how to use grep 1. The problem statement, all variables and given/known data: For each question, list the command lines used in addition to any other details... (3 Replies)
Discussion started by: alindner
3 Replies

5. UNIX for Advanced & Expert Users

where do the configuration files from Redhat (fedora) authconfig-tui reside?

I have tried moving out the /etc/ldap.conf as well as /etc/openldap/ldap.conf files. I have LDAP Authentication turned on in the TUI. It lets me define a host and base, but the entries are not saved to the above files. /etc/sysconfig/authconfig has a bunch of environmental variables, but none... (2 Replies)
Discussion started by: druidmatrix
2 Replies

6. Shell Programming and Scripting

How to grep using a line break in regular expressions?

Hi, I have a file as below, {#### if file then file else file } print file i need to fine the count of all the pattern - file, inside the { } i'm using a grep command as grep -c \{'*file*'\} fake.sh\ It doesn't gives me any result, i think the problem here is the... (5 Replies)
Discussion started by: divak
5 Replies

7. Shell Programming and Scripting

searching regular expressions with special characters like dot using grep

hi everybody I am a new user to this forum and its previous posts have been very useful. I'm searching in a file using grep for patterns like 12.13.444 55.44.443 i.e. of form <digit><digit>.<digit><digit>.<digit><digit><digit> Can anybody help me with this. Thanks in advance (4 Replies)
Discussion started by: jpriyank
4 Replies

8. Shell Programming and Scripting

Assistence With Using Asterisks in GREP Expressions

I am attempting to find all complete words which contain an asterisk at the beginning and the end - for instance, "*Hello?*" or "*you*". From what I've read, I would have thought that the following expression would do that just fine: \<\*.*\*\> \< denoting the beginning of a word. \*... (12 Replies)
Discussion started by: MagusScythe
12 Replies

9. UNIX for Dummies Questions & Answers

grep and regular expressions :

I wrote a simple korn shell where I am trying to filter all the good record layouts of a file to only leave the bad ones to look at. That file is hudge. Aside from '# comments' and 'var=ssss', all record should follow a specific record layout, with comma seperated fields. Some fields can have any... (2 Replies)
Discussion started by: Browser_ice
2 Replies

10. UNIX for Dummies Questions & Answers

More Grep - Regular Expressions

Hey all! I'm trying to search a file and return all instances of a word, let's say 'foo' in this case, as long as it's not a function name. For example: 1) int foo; //OK 2) //'this is totally fooed up' is also OK 3) int foo (int x, int y) //not ok to return I've tried a lot of regular... (7 Replies)
Discussion started by: Jombee
7 Replies
Login or Register to Ask a Question