awk 比较两个文件的异同

 # cat file1
module1 1.1 123
module2 2.1 123
module11
module12
 #cat file2
module1 1.1 123
module3 3.1 123
module21
module22

# ./compare.sh
module1 1.1 same
module3 3.1 different
module21 new  in file2
module22 new  in file2
module2 new  in file1
module11 new  in file1
module12 new  in file1

 #cat compare.sh
#!/bin/bash

#Compare two files and if $1 and $2 are same, print
awk 'NR==FNR{a[$1]=$2} NR>FNR &&a[$1]&&($2==a[$1]) { print $1,$2,"same"}' file1 file2

#Compare two files and if $2 are different , print
awk 'NR==FNR{a[$1]=$2} NR>FNR &&a[$1]&&($2!=a[$1]) { print $1,$2,"different" }' file1 file2


#Compare two files and if $1 and $2 are same, print,didn't consider blank lines
awk 'NR==FNR{a[$1]=$2} NR>FNR && (!a[$1]) { print $1,"new  in file2" }' file1 file2
awk 'NR==FNR{a[$1]=$2} NR>FNR && (!a[$1]) { print $1,"new  in file1" }' file2 file1