LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 05-07-2011, 01:29 AM   #1
Fracker
Member
 
Registered: Mar 2009
Posts: 86

Rep: Reputation: 0
Grep for "ab?c12345678" From a file


Hello,

How to grep a string like "ab?c12345678" where 3rd character is unknown, while other characters are known.
 
Old 05-07-2011, 02:24 AM   #2
grail
LQ Guru
 
Registered: Sep 2009
Location: Perth
Distribution: Manjaro
Posts: 9,254

Rep: Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686Reputation: 2686
Stick a dot in there instead, unless by using the question mark you are saying that it may or may not be there?
Code:
ab.c12345678
ab.?c12345678
These are different. I will leave you to find out what the difference is
 
1 members found this post helpful.
Old 05-07-2011, 02:24 AM   #3
penguiniator
Member
 
Registered: Feb 2004
Location: Olympia, WA
Distribution: SolydK
Posts: 442
Blog Entries: 3

Rep: Reputation: 60
Type "man grep" at a terminal and then "/REGULAR EXPRESSIONS":

"The period . matches any single character."

So: grep 'ab.c12345678' file

will search file for lines containing the above string with any character in the third position.

And: echo $string | grep 'ab.c12345678'

will search $string for the same pattern.
 
1 members found this post helpful.
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
how can I "cat" or "grep" a file to ignore lines starting with "#" ??? callagga Linux - Newbie 7 08-16-2013 07:58 AM
Grep in bash script returns "No such file or directory", works manually gizza23 Programming 7 02-25-2010 05:37 PM
Problem "$value=`mpstat 1 1 | grep "Average"`;" Alias pipe return nothing adamlucansky Linux - General 8 09-25-2009 08:26 AM
How to diagnose cause of grep returning "sense key Medium Error" on a particular file bcrozier Linux - Software 5 11-20-2008 10:54 AM
"Undeleting" data using grep, but get "grep: memory exhausted" error SammyK Linux - Software 2 03-13-2004 04:11 PM


All times are GMT -5. The time now is 02:36 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration