Inspired by the extremely short awk code from Ygor on this post I wanted to compare two files on only one field. I can't get it to work. Can anybody help on explaining the code and fix the code?
My code which does not work:
awk 'BEGIN{a[$1]=1};a[$1]!=1' file1.txt file2.txt >outfile.txt
file1.txt
\mgm\file1.pdf
\mgm\file3.pdf
\mgm\file6.pdf
\mgm\file7.pdf
\mgm\file8.pdf
file2.txt
\mgm\file2.pdf
\mgm\file3.pdf
\mgm\file6.pdf
\mgm\file7.pdf
\mgm\file9.pdf
Outfile.txt
\mgm\file2.pdf
\mgm\file9.pdf