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Trying to use diff output to compare to a separate file

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# 8  
Old 10-18-2017
Unfortunately, there's a small logical flaw in above; the sequence of files and thus how the arrays are populated DOES matter. Try
Code:
awk '
       FILENAME=="b" {arr[$0]++; next}
       FILENAME=="a" {if( !arr[$0] ) srch[$0]++}
       FILENAME=="c" {if(srch[$2]) print}
      '  b a c
test test.rpm


EDIT: How about
Code:
grep $(diff -y -b --suppress-common-lines a b | cut -f1) c
test test.rpm

This User Gave Thanks to RudiC For This Post:
jedlund21
# 9  
Old 10-18-2017
Hi.

See also Trying to use diff output to compare to a separate file - Unix & Linux Stack Exchange

cheers, drl
This User Gave Thanks to drl For This Post:
jedlund21
# 10  
Old 10-18-2017
Thanks RudiC, your awk statement worked perfectly and I was able to test it out on some different scenarios.

I tried the same grep command you did, but got a little stuck when the output wasn't what I liked..

Code:
smw:/working/iso_testing # grep $(diff -y -b --suppress-common-lines a b | cut -f1) c
grep: zip.rpm: No such file or directory
c:test test.rpm

P.S. I added the zip zip.rpm to my FILE C and zip.rpm to file A.

Thank you much!!!!
# 11  
Old 10-18-2017
That sounds like an unexpected result of the diff "command substitution", which in turn might be due to non-compliant input files' contents.
Please post the result of the diff alone / on its own.
# 12  
Old 10-18-2017
Code:
smw:/working/iso_testing # diff -y -b --suppress-common-lines a b | cut -f1
test.rpm
zip.rpm
smw:/working/iso_testing #
smw:/working/iso_testing # grep $(diff -y -b --suppress-common-lines a b | cut -f1) c
grep: zip.rpm: No such file or directory
c:test test.rpm

Last edited by Don Cragun; 10-18-2017 at 03:53 PM.. Reason: Fix CODE tags.
# 13  
Old 10-19-2017
Ah - sorry, my fault. Try enclosing the "command substitution" in double quotes and report back.
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