Using Diff to compare 2 arrays

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Using Diff to compare 2 arrays
# 1  
Old 11-14-2013
Using Diff to compare 2 arrays

I have two arrays and they look like this:

 array=(`cat /local/mnt/*sys/*includes|grep -v NEW`)

array2=(`cat /tmp/*sys.z |grep -v NEW`)

I am trying to compare them but I need to use the diff -u command. I am not sure how to do this. I cannot just do
 diff  -u ${array[@]} ${array2[@]}

I cannot do "for i in" as there are two arrays. I did not want to use the test format, but the diff -u command. Any suggestions?
# 2  
Old 11-14-2013
You use diff on files, not strings.

You can try this:

diff <(cat /local/mnt/*sys/*includes|grep -v NEW) <(cat /tmp/*sys.z |grep -v NEW)

# 3  
Old 11-14-2013
I keep getting "2 files needed"

when I run that command that Corona suggested, I get "diff: 2 filename arguments required" as I do with every attempt to use diff for these filelists.
# 4  
Old 11-14-2013
It certainly doesn't do that for me. Can you show me exactly what you're doing, word for word, letter for letter, keystroke for keystroke? And what shell you're using?
# 5  
Old 11-14-2013

Your last question, where you mention please let me know "letter by letter" how you typed the command made me think that my typing was bad. I found that the second cat statement did not have a space. Putting a space made it work.

)   <(cat /tmp/

instead of

) <(cat /tmp/

This User Gave Thanks to newbie2010 For This Post:
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Bash script to diff two arrays

Hi, I am quite scripting illiterate and have been trying to write a bash script to compare to two files which i have populated in two seperate arrays as below and confirmed that all the files are loaded into the array. IFS=$'\n' filea=($(find /var/tmp/dir1 -type f -follow -print))... (12 Replies)
Discussion started by: jlykke
12 Replies

2. Shell Programming and Scripting

Compare two arrays

Hi, I am trying to compare two lists that are held in two variables so I believe I need to access the array elements to compare these. I am using ksh 88 and the code I have tried is below: for file in ${origfilelist} do if ]] then print -- "File ${file}... (3 Replies)
Discussion started by: frodo61
3 Replies

3. Shell Programming and Scripting

perl: compare two arrays

Hi friends, I want to compare two arrays and find matched one using perl? Also, I want to delete unmatched one. Plz suggest me solution (1 Reply)
Discussion started by: Renesh
1 Replies

4. Shell Programming and Scripting

Perl Compare 2 Arrays

Hello, Consider the following 2 arrays: Array1 = qw(Fa0/0 Fa0/1 Fa0/2 Fa0/3); Array1 = qw(Fa0/1 Fa0/2 Fa0/3 Fa0/4); I want to compare the following 2 arrays as follows: Take specific action when elements of Array1 that doesn't exist in Array2 (in my example: Fa0/0). Take another... (4 Replies)
Discussion started by: ahmed_zaher
4 Replies

5. Shell Programming and Scripting

Compare arrays (perl)

Hi, my first post here! Description of my problem: I have one txt-file with six rows and each row contains seven numbers seperated with whitespaces. I want to: Compare one array with seven numbers with each row of numbers in the txt-file. I have managed to compare one array with... (6 Replies)
Discussion started by: mjoh
6 Replies

6. Shell Programming and Scripting

compare 2 arrays in perl

Hi Im supposed to compare lines in a file : KB0005 1019 T IFVATVPVI 0.691 PKC YES KB0005 1036 T YFLQTSQQL 0.785 PKC YES KB0005 1037 S FLQTSQQLK 0.585 DNAPK YES KB0005 1045 S KQLESEGRS 0.669 PKC YES KB0005 1045 S KQLESEGRS 0.880 unsp YES KB204320 1019 T IFVATVPVI 0.699 PKC YES ... (7 Replies)
Discussion started by: karla
7 Replies

7. Shell Programming and Scripting

Compare arrays in perl

Hello, Let's say that we have the two following arrays @array1= @array2= Is there any easy way to compare these two arrays and print the values that exist in array1 and not in array2 and the values that exist in array2 and not in array1? Regards, Chriss_58 (3 Replies)
Discussion started by: chriss_58
3 Replies

8. Shell Programming and Scripting

compare/match arrays

Hi there all, I am having a question. Is it posible to compare elements of 2 different arrays? For example I got Array 1 | Array 2 123_abc | 123_bcd 123_bcd | 234_bcd 234_abc | 567_abc 234_bcd | 123_abc than the match is 123_abc & 234_bcd and non of the others. So... (3 Replies)
Discussion started by: draco
3 Replies

9. Shell Programming and Scripting

Perl - Compare 2 Arrays

Hi all, I have the following script where the contents of file1 and file2 would be something like this: file1: 56790,0,0,100998765 89756,0,0,100567876 867645,1,3,678777654 file2: 56790,0,0,100998765 65776,0,0,4766457890 +5896,0,0,675489876 What I then want to do is check if... (4 Replies)
Discussion started by: Donkey25
4 Replies

10. Shell Programming and Scripting

Compare two arrays in sh or compare two fields

I want a soultion to compare two arrays in sh with an easy way.I want a solution to synchrose users between different AIX servers where no NIS is available. All users are meant to be same on all 10 servers. So the approach is to consider first server as master user repository and whatever the users... (0 Replies)
Discussion started by: rijeshpp
0 Replies
Login or Register to Ask a Question