Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Reading lines in a file matching a pattern
Top Forums Shell Programming and Scripting Reading lines in a file matching a pattern Post 302142176 by summer_cherry on Wednesday 24th of October 2007 11:11:01 PM
Old 10-25-2007
awk
Hi,

First of all, i would like to give you a suggestion that while you are here. try to give a example about your thread. Then it will be easy for others to understand your requirements and give you the suitable solution.

I assume your requirements as follow:

input:
Code:
a23456 line is the first line
abcd line is the second line
12345644 line is the third line
sadfjkl line is the forth line

output ( content in another file):
Code:
a23456 line is the first line
12345644 line is the third line

code:
awk '{
if (substr($0,2,5)+0==substr($0,2,5))
print
}' firstfile > secondfile
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

counting the lines matching a pattern, in between two pattern, and generate a tab

Hi all, I'm looking for some help. I have a file (very long) that is organized like below: >Cluster 0 0 283nt, >01_FRYJ6ZM12HMXZS... at +/99% 1 279nt, >01_FRYJ6ZM12HN12A... at +/99% 2 281nt, >01_FRYJ6ZM12HM4TS... at +/99% 3 283nt, >01_FRYJ6ZM12HM946... at +/99% 4 279nt,... (4 Replies)
Discussion started by: d.chauliac
4 Replies

2. Shell Programming and Scripting

delete lines in file matching a pattern

I have a text file, a sample of which is as follows: r/- * 0: WINDOWS/Microsoft.NET/Framework/v2.0.50727/ASP.NETWebAdminFiles/Images/headerGRADIENT_Tall.gif r/- * 0: WINDOWS/SoftwareDistribution/Download/cf8ec753e88561d2ddb53e183dc05c3e/backoff.jpg r/- * 0: ... (2 Replies)
Discussion started by: stumpyuk
2 Replies

3. Shell Programming and Scripting

Pattern matching in file and then display 10 lines above every time

hiii, i have to write a shell script like this---- i have a huge log file name abc.log .i have to search for a pattern name "pattern",it may occur 1000 times in the log file,every time it finds the pattern it should display the 10 lines above the pattern. I appericiate your help. (30 Replies)
Discussion started by: namishtiwari
30 Replies

4. Shell Programming and Scripting

pattern matching lines using the date, and then joining the lines

Hi Guys, Was trying to attempt the below using awk and sed, have no luck so far, so any help would be appreciated. Current Text File: The first line has got an "\n", and the second line has got spaces/tabs then the word and "\n" TIME SERVER/CLIENT TEXT... (6 Replies)
Discussion started by: eo29
6 Replies

5. Shell Programming and Scripting

Finding lines matching the Pattern and their previous lines in a file

Hi, I am trying to locate the occurences of certain pattern like 'Possible network disconnect' in a text file. I can get the actual lines matching the pttern using: grep -w 'Possible network disconnect' file_name. But I am more interested in getting the timing of these events which are... (7 Replies)
Discussion started by: sagarparadkar
7 Replies

6. UNIX for Dummies Questions & Answers

FIND matching pattern of lines in a file

I need to search for two patterns in a file and find number of matching lines. find . -type f | xargs grep "DROP TABLE" | wc -l find . -type f | xargs grep "DROP SYNONYM" | wc -l The above code works. However I am looking at finding a commnd that will simplify as on a singe command... (2 Replies)
Discussion started by: Siva SQL
2 Replies

7. Shell Programming and Scripting

Want to print out lines with a matching pattern from file

Hi all, I want to search for strings in file1 that can be found in file2 and print out the whole line when matching pattern is found. I have used the below command, but this is not working for me, because it is writing out only the matching patterns from file2, not the whole line. fgrep -o... (2 Replies)
Discussion started by: MonikaB
2 Replies

8. Shell Programming and Scripting

Sed: printing lines AFTER pattern matching EXCLUDING the line containing the pattern

'Hi I'm using the following code to extract the lines(and redirect them to a txt file) after the pattern match. But the output is inclusive of the line with pattern match. Which option is to be used to exclude the line containing the pattern? sed -n '/Conn.*User/,$p' > consumers.txt (11 Replies)
Discussion started by: essem
11 Replies

9. UNIX for Dummies Questions & Answers

Grep -v lines starting with pattern 1 and not matching pattern 2

Hi all! Thanks for taking the time to view this! I want to grep out all lines of a file that starts with pattern 1 but also does not match with the second pattern. Example: Drink a soda Eat a banana Eat multiple bananas Drink an apple juice Eat an apple Eat multiple apples I... (8 Replies)
Discussion started by: demmel
8 Replies

10. UNIX for Beginners Questions & Answers

Reading a file line by line and print required lines based on pattern

Hi All, i want to write a shell script read below file line by line and want to exclude the lines which contains empty value for MOUNTPOINT field. i am using centos 7 Operating system. want to read below file. # cat /tmp/d5 NAME="/dev/sda" TYPE="disk" SIZE="60G" OWNER="root"... (4 Replies)
Discussion started by: balu1234
4 Replies

LEARN ABOUT DEBIAN

k5identity

.K5LOGIN(5)							File Formats Manual						       .K5LOGIN(5)

NAME

       .k5identity - Kerberos V5 client principal selection rules

DESCRIPTION

       The  .k5identity  file,	which  resides in a user's home directory, contains a list of rules for selecting a client principals based on the
       server being accessed.  These rules are used to choose a credential cache within the cache collection when possible.

       Blank lines and lines beginning with '#' are ignored.  Each line has the form:

	      principal field=value ...

       If the server principal meets all of the field constraints, then principal is chosen as the client principal.   The  following  fields  are
       recognized:

       realm  If the realm of the server principal is known, it is matched against value, which may be a pattern using shell wildcards.  For host-
	      based server principals, the realm will generally only be known if there is a domain_realm section in krb5.conf with a  mapping  for
	      the hostname.

       service
	      If  the  server  principal  is  a host-based principal, its service component is matched against value, which may be a pattern using
	      shell wildcards.

       host   If the server principal is a host-based principal, its hostname component is converted to lower  case  and  matched  against  value,
	      which may be a pattern using shell wildcards.

       If  the	server	principal matches the constraints of multiple lines in the .k5identity file, the principal from the first matching line is
       used.  If no line matches, credentials will be selected some other way, such as the realm heuristic or the current primary cache.

EXAMPLE

       The following example .k5identity file selects the client principal alice@KRBTEST.COM if the server principal is  within  that  realm,  the
       principal  alice/root@EXAMPLE.COM if the server host is within a servers subdomain, and the principal alice/mail@EXAMPLE.COM when accessing
       the IMAP service on mail.example.com.

	      alice@KRBTEST.COM       realm=KRBTEST.COM
	      alice/root@EXAMPLE.COM  host=*.servers.example.com
	      alice/mail@EXAMPLE.COM  host=mail.example.com service=imap

SEE ALSO

       kerberos(1), krb5.conf(5)

																       .K5LOGIN(5)
All times are GMT -4. The time now is 10:41 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy