Question

我想从两个不同的文本文件中读取（行号相等），并将每行的第5列相互比较。但它对我不起作用。有人帮我吗？这是我的代码：

df -h --total>current_filesystem_usage.txt
if [ -s previous_months_filesystem_usage.txt ]
then 
  #reading from two different files and store each line into a variable
    while read current_file_line <&3 && read previous_file_line <&4
     do

    current_filesystem_name=$(cat $current_file_line | awk {'print $1'})
    current_filesystem_usage=$(cat $current_file_line | awk {'print $5'})

    previous_filesystem_name=$(cat $previous_file_line | awk {'print $1'})
    previous_filesystem_usage=$(cat $previous_file_line | awk {'print $5'})

    if [ ${current_filesystem_usage%?} -ge ${previous_filesystem_usage%?} ]
           then echo "There is problem !!! "
            echo "Current disk usage:${current_filesystem_name}, ${current_filesystem_usage}"
            echo "Previous month's disk usage:${previous_filesystem_name}, ${previous_filesystem_usage}"
        #I also want to store all echo output to output.txt file

    elif [ ${current_filesystem_usage%?} -lt ${previous_filesystem_usage%?} ]
             then echo "There is no problem. Everything is alright."
              echo "Current disk usage: ${current_filesystem_name}, ${current_filesystem_usage}"
              echo "Previous month's disk usage: ${previous_filesystem_name}, ${previous_filesystem_usage}"
       fi

         done 3<current_filesystem_usage.txt 4<previous_months_filesystem_usage.txt

fi

Answer 1

在awk中：

$ awk '
NR==FNR {               # process the first file
    a[FNR]=$5           # hash field $5 to a, use row number as key
    next }              # move to next record
$5 > a[FNR] {           # process the second file, if current is greater than previous
    print "error"       # output error
}
' file1 file2

它基本上将file1哈希到a并使用行号作为键。你没有在你的帖子中提到比较结果是什么，所以无法帮助更多的ATM。

从两个不同的文本文件中读取并获取每一行的列

1 个答案: