问题描述
我有一个bash脚本，该脚本从具有4列(无标题)的文本文件中读取行.行数最多可以为4行或更少.每行中的单词由空格字符分隔.
I have a bash script which reads lines from a text file with 4 columns(no headers). The number of lines can be a maximum of 4 lines or less. The words in each line are separated by SPACE character.
[email protected] [email protected];[email protected] Sub1 MailBody1
[email protected] [email protected];[email protected] Sub2 MailBody2
[email protected] [email protected];[email protected] Sub3 MailBody3
[email protected] [email protected];[email protected] Sub4 MailBody4
当前，我正在解析文件，在获取每一行之后，我将每一行中的每个单词存储到一个变量中，并调用mailx四次.想知道是否有一个优雅的awk/sed解决方案来解决以下提到的逻辑.
Currently, I am parsing the file and after getting each line, I am storing each word in every line into a variable and calling mailx four times. Wondering if is there is an elegant awk/sed solution to the below mentioned logic.
- 查找总行数
- 在
read $line期间，将每一行存储在一个变量中 - 将每行解析为
i=( $line1 )，j=( $line2 )等 - 从每行获取
${i[0]}，${i[1]}，${i[2]}和${i[3]}等的值 - 致电
mailx -s ${i[2]} -t ${i[1]} -r ${i[0]} < ${i[3]} - 解析下一行并调用
mailx - 执行此操作，直到没有更多行或最多4行为止
- find total number of lines
- while
read $line, store each line in a variable - parse each line as
i=( $line1 ),j=( $line2 )etc - get values from each line as
${i[0]},${i[1]},${i[2]}and${i[3]}etc - call
mailx -s ${i[2]} -t ${i[1]} -r ${i[0]} < ${i[3]} - parse next line and call
mailx - do this until no more lines or max 4 lines have been reached
awk或sed是否为上述迭代/循环逻辑提供了一种优雅的解决方案?
Do awk or sed provide an elegant solution to the above iterating/looping logic?
推荐答案
试一下:
head -n 4 mail.txt | while read from to subject body; do
mailx -s "$subject" -t "$to" -r "$from" <<< "$body"
done
-
head -n 4最多可从文本文件读取四行. -
read可以从一行读取多个变量，因此我们可以使用命名变量来提高可读性. -
<<<可能是您要重定向的内容，而不是<.大概吧. head -n 4reads up to four lines from your text file.readcan read multiple variables from one line, so we can use named variables for readability.<<<is probably what you want for the redirection, rather than<. Probably.
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