问在文件B中，从A文件中查找模式，然后用C文件中的模式替换，逐行

EN

paste fileA fileC \
|awk 'NR==FNR{ mapping[$1] =$2; next }
             { for(pat in mapping){ 
                   gsub(pat, mapping[pat])
             };
             print
}' - fileB

awk '
FNR==NR{
  arr[$0]=FNR
  next
}
FILENAME=="fileC.txt"{
  arrVal[++count]=$0
  next
}
FILENAME=="fileB.txt"{
  for(key in arr){
    if(sub(key,arrVal[arr[key]])){
      break
    }
  }
  print
}
' fileA.txt fileC.txt fileB.txt

4472534
866FF72
3511GYT
333553D
8645141
242HHJK

awk '                                 ##Starting awk program from here.
FNR==NR{                              ##Checking condition which will be TRUE when fileA.txt is being read.
  arr[$0]=FNR                         ##Creating arr with index of current line and value of current line number.
  next                                ##next will skip all further statements from here.
}
FILENAME=="fileC.txt"{                ##Checking condition if file name is fileC.txt then do following.
  arrVal[++count]=$0                  ##Creating arrVal with index of count increasing value of 1 and having current line as its value.
  next                                ##next will skip all further statements from here.
}
FILENAME=="fileB.txt"{                ##Checking condition if file name is fileB.txt then do
  for(key in arr){                    ##Traversing through array arr here.
    if(sub(key,arrVal[arr[key]])){    ##Checking condition if substitution of arrVal[arr[key]] is successfully done with key in current line, which basically changes the values in fileB values.
      break                           ##Come out of loop to save some cycles.
    }
  }
  print                               ##Printing current line here.
}
' fileA.txt fileC.txt fileB.txt       ##Mentioning Input_file names here.

sed "$(paste fileA.txt fileC.txt | sed 's/\(.*\)\t\(.*\)/s@\1@\2@g/')" fileB.txt