Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

compare 2 files

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting compare 2 files
# 1  
Old 11-14-2011
Question compare 2 files
Hi,

I have 2 files as below:

file1 (take note that this is an 800MB-sized file)
Code:
111111,1111
222222,2222
333333,3333

and

file2 (4MB file)
Code:
111111
444444
333333

I need to compare 1st field of both files and produce field2, as below:
Code:
1111
3333

I tried this (based from another post):
Code:
awk -F"," 'FILENAME=="file1"{A[$1]=$1} FILENAME=="file2"{if(A[$1]){print}}'

and this (also based from another post):
Code:
nawk -F"," 'BEGIN{while(getline<"file1") a [$1]=1 } ; a [$1] ==1 {print $2 }'  file2

Both didn't work for me. Smilie

Hope you can help.

Thanks!
Last edited by Franklin52; 11-15-2011 at 08:39 AM.. Reason: Please use code tags
# 2  
Old 11-14-2011
define "didn't work" - you got errors? your computer froze? what exactly happened? Also, you have file1 and file2 reversed in the logic. you read the smaller file first, then find matches in the bigger one.
# 3  
Old 11-14-2011
Code:
awk -F , 'NR==FNR{a[$1];next} $1 in a{print $2}' file2 file1

This User Gave Thanks to rdcwayx For This Post:
daytripper1021
# 4  
Old 11-15-2011
Code:
$ fgrep -f file2 file1 | cut -d',' -f2

# 5  
Old 11-15-2011
MySQL
Quote:
Originally Posted by rdcwayx
Code:
awk -F , 'NR==FNR{a[$1];next} $1 in a{print $2}' file2 file1

This worked beautifully! Thanks!!!Smilie
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Compare files and share output from both files

hi all, Thanks to all for your great help... I have a scenario that I have two files (file1 & file2). I need to compare two files entire row by row and share the output if any discrepancies within two files. File1: DB1|TB1|C1,C3 DB2|TB2|C1,C2 DB3|TB3|C1,C2,C3,C4 File2: ... (2 Replies)
Discussion started by: Selva_2507
2 Replies

2. Shell Programming and Scripting

Compare multiple files, and extract items that are common to ALL files only

I have this code awk 'NR==FNR{a=$1;next} a' file1 file2 which does what I need it to do, but for only two files. I want to make it so that I can have multiple files (for example 30) and the code will return only the items that are in every single one of those files and ignore the ones... (7 Replies)
Discussion started by: castrojc
7 Replies

3. Shell Programming and Scripting

Compare two files, then overwrite first file with only that in both files

I want to compare two files, and search for items that are in both. Then override the first file with that containing only elements which were in both files. I imagine something with diff, but not sure. File 1 One Two Three Four Five File 2 One Three Four Six Eight (2 Replies)
Discussion started by: castrojc
2 Replies

4. Shell Programming and Scripting

Compare files

Please help me with awk.I have two files with the below details file1 123456789 2012 987654321 2011 a1234567892012 a1234abcde2012 b1234567892012 c1234567892012 98765a12342012 file2 a1234 01234 b1234 33333 I need to check whether the items in file2 is present in file1 .If it is... (2 Replies)
Discussion started by: Mary James
2 Replies

5. Shell Programming and Scripting

Require compare command to compare 4 files

I have four files, I need to compare these files together. As such i know "sdiff and comm" commands but these commands compare 2 files together. If I use sdiff command then i have to compare each file with other which will increase the codes. Please suggest if you know some commands whcih can... (6 Replies)
Discussion started by: nehashine
6 Replies

6. Shell Programming and Scripting

Compare 2 folders to find several missing files among huge amounts of files.

Hi, all: I've got two folders, say, "folder1" and "folder2". Under each, there are thousands of files. It's quite obvious that there are some files missing in each. I just would like to find them. I believe this can be done by "diff" command. However, if I change the above question a... (1 Reply)
Discussion started by: jiapei100
1 Replies

7. Shell Programming and Scripting

How to compare 2 files & get only few columns based on a condition related to both files?

Hiiiii friends I have 2 files which contains huge data & few lines of it are as shown below File1: b.dat(which has 21 columns) SSR 1976 8 12 13 10 44.00 39.0700 70.7800 7.0 0 0.00 0 2.78 0.00 0.00 0 0.00 2.78 0 NULL ISC 1976 8 12 22 32 37.39 36.2942 70.7338... (6 Replies)
Discussion started by: reva
6 Replies

8. Shell Programming and Scripting

compare files in two directories and output changed files to third directory

I have searched about 30 threads, a load of Google pages and cannot find what I am looking for. I have some of the parts but not the whole. I cannot seem to get the puzzle fit together. I have three folders, two of which contain different versions of multiple files, dist/file1.php dist/file2.php... (4 Replies)
Discussion started by: bkeep
4 Replies

9. Shell Programming and Scripting

compare two files and to remove the matching lines on both the files

I have two files and need to compare the two files and to remove the matching lines from both the files (4 Replies)
Discussion started by: shellscripter
4 Replies

10. Shell Programming and Scripting

compare two files

I have file1 and file2: file1: 11 xxx kksd ... 22 kkk kdsglg... 33 sss kdfjdksa... 44 kdsf dskjfkas ... hh kdkf kdkkd.. jg dkf dfkdk ... ... file2: jg 22 hh ... I need to check each line of file1. if the field one is in file2, I will keep it; if not, the whole line will be... (17 Replies)
Discussion started by: fredao
17 Replies
Login or Register to Ask a Question