นี่คือวิธีหนึ่ง ฉันเขียนเป็นสคริปต์ awk เพื่อให้ฉันสามารถเพิ่มความคิดเห็น:
#!/usr/local/bin/awk -f
{
## FNR is the line number of the current file, NR is the number of
## lines that have been processed. If you only give one file to
## awk, FNR will always equal NR. If you give more than one file,
## FNR will go back to 1 when the next file is reached but NR
## will continue incrementing. Therefore, NR == FNR only while
## the first file is being processed.
if(NR == FNR){
## If this is the first file, save the values of $1
## in the array n.
n[$1] = 0
}
## If we have moved on to the 2nd file
else{
## If the 3rd field of the second file exists in
## the first file.
if($3 in n){
## Add the value of the 5th field to the corresponding value
## of the n array.
n[$3]+=$5
}
}
}
## The END{} block is executed after all files have been processed.
## This is useful since you may have more than one line whose 3rd
## field was specified in the first file so you don't want to print
## as you process the files.
END{
## For each element in the n array
for (i in n){
## print the element itself and then its value
print i,":",n[i];
}
}
คุณสามารถบันทึกเป็นไฟล์ทำให้สามารถเรียกใช้และเรียกใช้ได้โดย:
$ chmod a+x foo.awk
$ ./foo.awk file1 file2
1 : 7
2 : 2
3 : 4
หรือคุณสามารถรวมเข้าเป็นหนึ่งซับ:
awk '
(NR == FNR){n[$1] = 0; next}
{if($3 in n){n[$3]+=$5}}
END{for (i in n){print i,":",n[i]} }' file1 file2