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Compare two files and show the differences only using shell command
awk ‘BEGIN { while ( getline < "file1.txt" ) { arr[$0]++ } } { if (!( $0 in arr ) ) { print } }' file2.txt
awk ‘BEGIN { while ( getline < "file1.txt" ) { arr[$0]++ } } { if (!( $0 in arr ) ) { print } }' file2.txt