使用awk或sed比较两个文件的值，并将文件2到文件1的信息附加到新文件file3

Question

我有2个文件：文件1和文件2.我想检查并比较文件1和文件2中的文件名以及它们匹配的位置，只使用awk或sed将file_2中的数字插入到新的File_3中

我尝试过使用

cat file.2 | while read line do 

Answer 1

试试这个：

awk 'NR==FNR { d[$NF]=$1; next } d[$NF] { print d[$NF] FS $0 }' FILE2 FILE1

Answer 2

你可以自己定义功能来检查文件。

checkDiff() {
   file1=$1
   file2=$2
   result=$3
   rm -rf $result
   #check Which one is big based line count
   file1Count=$(cat ${file1}  | wc -l)
   file2Count=$(cat ${file2}  | wc -l)
   # to check which one need to pass to while loop
   if [ $file1Count -gt $file2Count ] ; then
        bigFile=$file1
        smallFile=$file2
   else
        bigFile=$file2
        smallFile=$file1
   fi
   #check difference line by line
   cat $bigFile | while read line ; do
       notpint=$(cat $smallFile | grep  "$line")
       if [ $? -ne 0 ]; then           # if you want to print where they match change "ne" to "eq"
           echo $line >> $result
       fi
   done
   }

＃

checkDiff <file1> <file2> <result filename>