Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Incredibly inefficient cat | grep script
Top Forums Shell Programming and Scripting Incredibly inefficient cat | grep script Post 302913095 by Perderabo on Wednesday 13th of August 2014 04:22:24 PM
Old 08-13-2014
I'm not sure what thes files look like. But if they are sorted on the id field it sounds like this is just what the "join" command does. Here is a sample run:
Code:
$
$
$ cat file1
8  user 092 kjhuhggty
4  user 343 nbvnvcvc
9  user 391 jllklklkj
6  user 549 rewrewer
2  user 654 kjlkjl
7  user 760 jbjftgd
1  user 777 hkhghgh
3  user 888 hghfgfhgf
5  user 984 nbvnbvmn
$
$
$ cat file2
391
654
760
777
888
999
$
$
$ join -1 3 -2 1 -o "1.1 1.2 1.3 1.4"  file1 file2
9 user 391 jllklklkj
2 user 654 kjlkjl
7 user 760 jbjftgd
1 user 777 hkhghgh
3 user 888 hghfgfhgf
$
$

 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

cat and grep not working

I am trying to cat a file and then grep that file for a number. I can do it fine on other files but this particular file will not do anything. I tried running it on an older file from the same device but it is just not working. The file is nothing more than a flat file on a unix box. Here is just a... (3 Replies)
Discussion started by: jphess
3 Replies

2. Shell Programming and Scripting

cat in the command line doesn't match cat in the script

Hello, So I sorted my file as I was supposed to: sort -n -r -k 2 -k 1 file1 | uniq > file2 and when I wrote > cat file2 in the command line, I got what I was expecting, but in the script itself ... sort -n -r -k 2 -k 1 averages | uniq > temp cat file2 It wrote a whole... (21 Replies)
Discussion started by: shira
21 Replies

3. Shell Programming and Scripting

Perl sum really inefficient!!

Hi all, I have a file like the following: ID, 2,Andrew,0,1,2,3,4,2,5,6,7,7,9,3,4,5,34,3,2,1,5,6,78,89,8,7,6...................... 4,James,0,6,7,0,5,6,4,7,8,9,6,46,6,3,2,5,6,87,0,341,0,5,2,5,6.................... END, (there are more entires on each line but to keep it simple I've left... (10 Replies)
Discussion started by: Donkey25
10 Replies

4. Shell Programming and Scripting

Problem with IF - CAT - GREP in simple shell script

Hi all, Here is my requirement I have to search 'ORA' word in out.log file,if it is present then i need to send that file (out.log) content to some mail id.If 'ORA' word is not in that file then i need to send 'load succesful' message to some mail id. The below the shell script is not... (5 Replies)
Discussion started by: mak_boop
5 Replies

5. Shell Programming and Scripting

cat /etc/passwd and grep -v on /etc/shells

Hi All, I'd like to do this cat /etc/passwd and grep -v on the /etc/shells list I'd like to find all shell that doesn't exist on the /etc/passwd. Is there an easy way without doing a egrep -v "/bin/sh|/bin/bash................"? How do I use a file /etc/shells as my list for... (4 Replies)
Discussion started by: itik
4 Replies

6. Shell Programming and Scripting

cat -n and grep

I am not sure if using cat -n is the most efficient way to split a file into multiple files, one file per line in the source file. I thought using cat -n would make it easy to process the file because it produces an output that numbers each line that I could then grep for with the regex "^ *$i".... (3 Replies)
Discussion started by: kapu
3 Replies

7. Shell Programming and Scripting

grep or cat using sed

Is there a way using grep or cat a file to create a new file based on whether the first 9 positions of each record is less than 399999999? This is a fixed file format. (3 Replies)
Discussion started by: ski
3 Replies

8. UNIX for Dummies Questions & Answers

Grep and cat combined

Hello, i need to search one word (snp1) from many files and copy the content of the columns of this word in new file. example: file 1: SNP BP CHR P snp1 1 3 0.01 snp2 2 2 0.05 . . file 2: SNP BP CHR P snp1 1 3 0.06 snp2 2 2 0.3 output... (6 Replies)
Discussion started by: biopsy
6 Replies

9. Shell Programming and Scripting

Replace cat and grep with <

Hello someone told me to use OS=`awk '{print int($3)}' < /etc/redhat-release` instead of OS=cat /etc/redhat-release | `awk '{print int($3)}'` any idea for the reason ? (5 Replies)
Discussion started by: nimafire
5 Replies

10. UNIX for Dummies Questions & Answers

Grep or cat The Whole Directory PROBLEMS :(

Hi Guys This is my first post so I am not sure how things go here. I'm sorry if I'm breaking the rule or something. Feel free to correct me about that :) So as I was saying... I'd been trying to grep this folder containing 900,000 txt files but seems no luck. I get either "No such file... (6 Replies)
Discussion started by: Nexeu
6 Replies

LEARN ABOUT DEBIAN

fprev

NEW(1)								     [nmh-1.5]								    NEW(1)

NAME

       new - report on folders with new messages

       fnext - set current folder to next folder with new messages

       fprev - set current folder to previous folder with new messages

       unseen - scan new messages in all folders with new messages

SYNOPSIS

       new [sequences] [-mode mode] [-folders foldersfile] [-version] [-help]

       fnext is equivalent to new -mode fnext

       fprev is equivalent to new -mode fprev

       unseen is equivalent to new -mode unseen

DESCRIPTION

       New  in	its  default  mode  produces  a  one-line-per-folder  listing of all folders containing messages in the listed sequences or in the
       sequences listed in the profile entry "Unseen-Sequence".  Each line contains the folder, the number of messages in the  desired	sequences,
       and the message lists from the .mh_sequences file.  For example:

	    foo     11.* 40-50
	    bar    380.  760-772 824-828
	     total    391.

       The `*' on foo indicates that it is the current folder.	The last line shows the total number of messages in the desired sequences.

       New crawls the folder hierarchy recursively to find all folders, and prints them in lexicographic order.  Override this behavior by provid-
       ing foldersfile containing the pre-sorted list of folders new should check, one per line.

       In fnext and fprev modes, new instead changes to the next or previous matching folder, respectively.

       In unseen mode, new executes scan sequences for each matching folder.

FILES

       $HOME/.mh_profile	  The user profile

PROFILE COMPONENTS

       Path:		    To determine the user's nmh directory
       Current-Folder:	    To find the default current folder
       Unseen-Sequence:     The name of the unseen message sequence

SEE ALSO

       scan(1), mh-format(5)

HISTORY

       Based on Luke Mewburn's new (http://www.mewburn.net/luke/src/new).

MH.6.8								   11 June 2012 							    NEW(1)
All times are GMT -4. The time now is 03:42 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy