for-loop - 我可以用 awk "for loop"执行 '!seen[$0]' 来应用于多个 .txt 文件吗？

Question

我想删除多个.text文件中的一些重复行 我需要独立分析每个文件，因为它们彼此不相关，使用:

awk '!seen[$0]' file.txt file.out

但是当我尝试时:

for f in *.txt; do awk 'seen![$0]' $f $f.out; done

我收到错误:
无法打开文件“$f”。 awk 或 '!已看到 [$ 0]' 无法识别 有时我会得到一个输出文件，但它是同一个文件......

Answer 1

对于非 GNU awk，请尝试以下操作。

awk -v temp_out="file.out" '
FNR==1{
  if(prev_filename){
    close(temp_out)
    sub(/\.txt/,".out",prev_filename)
    system("mv -- \047" prev_out "\047 \047" prev_filename "\047")
  }
  prev_filename=FILENAME
  delete seen
}
!seen[$0]++{
  print > (temp_out)
}
END{
  if(prev_filename){
    close(temp_out)
    sub(/\.txt/,".out",prev_filename)
    system("mv -- \047" prev_out "\047 \047" prev_filename "\047")
  }
}
' *.txt

说明:为上述代码添加说明。

awk -v temp_out="file.out" '                        ##Starting awk program from here with setting variable prev_out to file.out here.
FNR==1{                                             ##Checking condition if line is first line then do following.
  if(prev_filename){                                ##Checking if prev_filename is NOT NULL then do following.
    close(temp_out)                                 ##Closing prev_out file here from back-end.
    sub(/\.txt/,".out",prev_filename)               ##Substitute .txt with .out in previous filename here.
    system("mv -- \047" prev_out "\047 \047" prev_filename "\047")        ##Using system command to rename temp file prev_out with prev_filename(with .out)
  }
  prev_filename=FILENAME                            ##Setting prev_filename to current FILENAME here.
  delete seen                                       ##Deleting array seen here.
}
!seen[$0]++{                                        ##Checking if current line is NOT present in array seen then do following.
  print > (temp_out)                                ##Printing current line to temp file here.
}
END{                                                ##Starting END block of this program from here.
  if(prev_filename){                                ##Checking if prev_filename is NOT NULL then do following.
    close(temp_out)                                 ##Closing prev_out file here from back-end.
    sub(/\.txt/,".out",prev_filename)               ##Substitute .txt with .out in previous filename here.
    system("mv -- \047" prev_out "\047 \047" prev_filename "\047")        ##Using system command to rename temp file prev_out with prev_filename(with .out)
  }
}
' *.txt                                             ##Mentioning all .txt files here.