Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Another grep question
Top Forums UNIX for Dummies Questions & Answers Another grep question Post 302094358 by ghostdog74 on Friday 27th of October 2006 01:56:13 AM
Old 10-27-2006
Quote:
Originally Posted by kingdbag
Say I want to grep for a line with EXEC in it

grep EXEC blah.conf

thats cool but what if i want to grep for EXEC and if it finds a line with that in it to also grab the two lines above it?
Python alternative:
Sample input:
abc
def
ghi
EXEC
klm
nop
qrs
tuv
wxy


Code:
#!/usr/bin/python
data = open("input.txt").readlines()
for linenum , line in enumerate(data):
 	if 'EXEC' in line:
 		print ''.join(data[linenum - 2 : linenum])

output:
Code:
def
ghi

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

grep question

what is the format for grep if I want to search from the current directory and through all its subdirectories?:) (3 Replies)
Discussion started by: pkappaz
3 Replies

2. UNIX for Dummies Questions & Answers

Grep Question

Hello Everybody, I have files; yyyymmdd.log which the data look like this; "Txid=9426043&MsgTxt=Thankyou&UserId=john&Password=jh2501" "Txid=9426150&MsgTxt=Thankyou&UserId=john&Password=jh2501" . . . "Txid=9426200&MsgTxt=Thankyou&UserId=john&Password=jh2501" Question 1: How to... (3 Replies)
Discussion started by: nazri76
3 Replies

3. Shell Programming and Scripting

grep question

hello people, All my servers have 4 mounts with this norme. For example, if my hostname is siroe. df -h | grep `hostname` /dev/dsk/c1t3d0s6 404G 399G 800M 100% /siroe3 /dev/dsk/c1t2d0s6 404G 399G 800M 100% /siroe2 /dev/md/dsk/d6 20G 812M 19G ... (3 Replies)
Discussion started by: melanie_pfefer
3 Replies

4. UNIX for Dummies Questions & Answers

grep question

Instead of using the following command #dmesg | grep -v sendmail | grep -v xntpd How can I use just one grep -v and give both arguments. Please suggest thanks (4 Replies)
Discussion started by: Tirmazi
4 Replies

5. Shell Programming and Scripting

grep question

Hello, Is there a way in grep to remember patterns? For eg: int a,b,c,d,a; If a variable is declared twice, like in the previous example, I should be able to print only those lines. Is there a way to print only the lines where the variable name occurs more than once, using grep... (1 Reply)
Discussion started by: prasanna1157
1 Replies

6. Shell Programming and Scripting

grep question please

i have files with "DOMAINSOLVER ACMS" with any number of spaces in between the two words on its own line and i can find it with the following: grep -c "DOMAINSOLVER* ACMS" $FILENAMEbut i need to exclude any lines matching: "$DOMAINSOLVER". i've tried a variety of quoting and escaping with no luck.... (4 Replies)
Discussion started by: crimso
4 Replies

7. Shell Programming and Scripting

Question about grep

can anyone tell me what the \/$ means? from grep \/$ (8 Replies)
Discussion started by: Nick1097
8 Replies

8. Shell Programming and Scripting

Question about grep

is there anyway i can ask grep to only get the first line? as in the top command line line 1 <-- just grep this line line 2 line 3 ---------- Post updated at 04:24 PM ---------- Previous update was at 04:19 PM ---------- nvm.. found out that i can do it with |head (12 Replies)
Discussion started by: Nick1097
12 Replies

9. UNIX for Dummies Questions & Answers

Question on grep

Hello all, I'm trying to grep the string "scott" from all files whose names are like srvr*.log and that were created "Nov 15"...I'm trying the following command but throws an error message...seems like the syntax is incorrect.. grep scott < ls -l srvr*.log|grep "Nov 15" Thanks for your... (9 Replies)
Discussion started by: luft
9 Replies

10. UNIX for Dummies Questions & Answers

Grep Question

My grep returns a row of data like this: 75=20130130;60=074338;61=985;511=55473883;452=115439;62=196;267=1; Is there a way for the grep to only return 60="something" and 511="something" ? Thanks in advance. (10 Replies)
Discussion started by: Carl2013
10 Replies

LEARN ABOUT ULTRIX

ldlinit

ldlread(3x)															       ldlread(3x)

Name
       ldlread, ldlinit, ldlitem - manipulate line number entries of a common object file function

Syntax
       #include <stdio.h>
       #include <filehdr.h>
       #include <syms.h>
       #include <ldfcn.h>

       int ldlread (ldptr, fcnindx, linenum, linent)
       LDFILE *ldptr;
       long fcnindx;
       unsigned short linenum;
       LINER linent;

       int ldlinit (ldptr, fcnindx)
       LDFILE *ldptr;
       long fcnindx;

       int ldlitem (ldptr, linenum, linent)
       LDFILE *ldptr;
       unsigned short linenum;
       LINER linent;

Description
       The  function  searches	the line number entries of the common object file currently associated with ldptr.  The function begins its search
       with the line number entry for the beginning of a function and confines its search to the line numbers associated with a  single  function.
       The  function  is identified by fcnindx, which is the index of its local symbols entry in the object file symbol table.	The function reads
       the entry with the smallest line number equal to or greater than linenum into linent.

       The and functions provide the same behavior as After an initial call to or can be used to retrieve a series of line number entries  associ-
       ated with a single function.  The function simply finds the line number entries for the function identified by fcnindx.	The function finds
       and reads the entry with the smallest line number equal to or greater than linenum into linent.

       The functions and each return either success or failure.  The function fails if one of the following occurs:

       o    If line number entries do not exist in the object file.

       o    If fcnindx does not index a function entry in the symbol table.

       o    If it does not find a line number equal to or greater than linenum.

       The fails if it does not find a line number equal to or greater than linenum.

See Also
       ldclose(3x), ldopen(3x), ldtbindex(3x), ldfcn(5)

								       RISC							       ldlread(3x)
All times are GMT -4. The time now is 10:28 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy