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Using Diff to compare 2 arrays


 
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# 1  
Old 11-14-2013
Using Diff to compare 2 arrays

I have two arrays and they look like this:

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

Code:
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
Code:
 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:

Code:
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
Thanks!

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.

Code:
)   <(cat /tmp/

instead of

Code:
) <(cat /tmp/

This User Gave Thanks to newbie2010 For This Post:

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