Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: find lines in file1.txt not found in file2.txt memory problem
Top Forums UNIX for Dummies Questions & Answers find lines in file1.txt not found in file2.txt memory problem Post 302539253 by alister on Friday 15th of July 2011 11:38:46 PM
Old 07-16-2011
You might get lucky with the following grep approach. It should consume less memory than your diff solution:
Code:
grep -vxFf file2 file1

If file2 is large and contains many duplicates, filtering it through sort|uniq would help.


Regards,
Alister
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

echo "ABC" > file1.txt file2.txt file3.txt

Hi Guru's, I need to create 3 files with the contents "ABC" using single command. Iam using: echo "ABC" > file1.txt file2.txt file3.txt the above command is not working. pls help me... With Regards / Ganapati (4 Replies)
Discussion started by: ganapati
4 Replies

2. Shell Programming and Scripting

sed to cp lines x->y from 1.txt into lines a->b in file2.txt

I have one base file, and multiple target files-- each have uniform line structure so no need to use grep to find things-- can just define sections by line number. My question is quite simple-- can I use sed to copy a defined block of lines (say lines 5-10) from filename1.txt to overwrite an... (3 Replies)
Discussion started by: czar21
3 Replies

3. Shell Programming and Scripting

merging two .txt files by alternating x lines from file 1 and y lines from file2

Hi everyone, I have two files (A and B) and want to combine them to one by always taking 10 rows from file A and subsequently 6 lines from file B. This process shall be repeated 40 times (file A = 400 lines; file B = 240 lines). Does anybody have an idea how to do that using perl, awk or sed?... (6 Replies)
Discussion started by: ink_LE
6 Replies

4. Shell Programming and Scripting

awk '{print $ from file1.txt}'

Hi All, I have a file1.txt where the index of the columns are placed. I want to get the columns from file2.txt corresponding to these index numbers. I was usually using awk '{print $5, $6, $2, $3, ...}' file2.txt > output.txt However, this list is very long. So, i want to read the... (4 Replies)
Discussion started by: senayasma
4 Replies

5. Shell Programming and Scripting

How to find lines in a .txt contains the strings I want

I have a .txt contains a lot of lines. Now I want to write a shell script to find out all the lines which contain the strings I want, and print these lines. For example: A.txt when you post any code you can easily do this highlighting your code and then click you should do a Google... (6 Replies)
Discussion started by: Henryyy
6 Replies

6. UNIX for Dummies Questions & Answers

if matching strings in file1 and file2, add column from file1 to file2

I have very limited coding skills but I'm wondering if someone could help me with this. There are many threads about matching strings in two files, but I have no idea how to add a column from one file to another based on a matching string. I'm looking to match column1 in file1 to the number... (3 Replies)
Discussion started by: pathunkathunk
3 Replies

7. Shell Programming and Scripting

Delete file2.txt from file1.txt using scripting

Hi, I`m a total newbie, well my requirement is that i have 2 files I want to identify which countries i do not currently have in db.. how can i use the grep or another command to find this file .. i want to match all-countries.txt with countries-in-db.txt so the output is equal to... (11 Replies)
Discussion started by: beanbaby
11 Replies

8. Shell Programming and Scripting

Based on column in file1, find match in file2 and print matching lines

file1: file2: I need to find matches for any lines in file1 that appear in file2. Desired output is '>' plus the file1 term, followed by the line after the match in file2 (so the title is a little misleading): This is honestly beyond what I can do without spending the whole night on it, so I'm... (2 Replies)
Discussion started by: pathunkathunk
2 Replies

9. UNIX for Dummies Questions & Answers

Compare file1 and file2, print matching lines in same order as file1

I want to print only the lines in file2 that match file1, in the same order as they appear in file 1 file1 file2 desired output: I'm getting the lines to match awk 'FNR==NR {a++}; FNR!=NR && a' file1 file2 but they are in sorted order, which is not what I want: Can anyone... (4 Replies)
Discussion started by: pathunkathunk
4 Replies

10. Shell Programming and Scripting

Awk, sed, shell all words in INPUT.txt find in column1 of TABLE.txt and replce with column2 in

Hi dears i have text file like this: INPUT.txt 001_1_173 j nuh ]az 001_1_174 j ]esma. nuh ]/.xori . . . and have another text like this TABLE.txt j j nuh word1... (6 Replies)
Discussion started by: alii
6 Replies

LEARN ABOUT OPENSOLARIS

comm

comm(1) 							   User Commands							   comm(1)

NAME

       comm - select or reject lines common to two files

SYNOPSIS

       comm [-123] file1 file2

DESCRIPTION

       The comm utility reads file1 and file2, which must be ordered in the current collating sequence, and produces three text columns as output:
       lines only in file1; lines only in file2; and lines in both files.

       If the input files were ordered according to the collating sequence of the current locale, the lines  written  will  be	in  the  collating
       sequence of the original lines. If not, the results are unspecified.

OPTIONS

       The following options are supported:

       -1    Suppresses the output column of lines unique to file1.

       -2    Suppresses the output column of lines unique to file2.

       -3    Suppresses the output column of lines duplicated in file1 and file2.

OPERANDS

       The following operands are supported:

       file1	A path name of the first file to be compared. If file1 is -, the standard input is used.

       file2	A path name of the second file to be compared. If file2 is -, the standard input is used.

USAGE

       See largefile(5) for the description of the behavior of comm when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

EXAMPLES

       Example 1 Printing a list of utilities specified by files

       If file1, file2, and file3 each contain a sorted list of utilities, the command

	 example% comm -23 file1 file2	| comm -23 - file3

       prints a list of utilities in file1 not specified by either of the other files. The entry:

	 example% comm -12 file1 file2 | comm -12 - file3

       prints a list of utilities specified by all three files. And the entry:

	 example% comm -12  file2 file3 | comm -23 -file1

       prints a list of utilities specified by both file2 and file3, but not specified in file1.

ENVIRONMENT VARIABLES

       See  environ(5)	for  descriptions  of  the  following  environment  variables that affect the execution of comm: LANG, LC_ALL, LC_COLLATE,
       LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0     All input files were successfully output as specified.

       >0    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cmp(1), diff(1), sort(1), uniq(1), attributes(5), environ(5), largefile(5), standards(5)

SunOS 5.11							    3 Mar 2004								   comm(1)
All times are GMT -4. The time now is 02:47 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy