在heredoc部分设置变量 [英] set variable in heredoc section

问题描述

我是一个shell脚本新手，所以我必须做一些愚蠢的事，为什么这项工作不起作用:

I'm a shell script newbie, so I must be doing something stupid, why won't this work:

#!/bin/sh

myFile=$1

while read line
do
ssh $USER@$line <<ENDSSH
ls -d foo* | wc -l 
count=`ls -d foo* | wc -l`
echo $count
ENDSSH
done <$myfile

应该打印两行，每行应该具有相同的值...但是它们没有.第一个打印语句[ls -d foo *的结果| wc -l]的值正确，第二个打印语句不正确，它始终打印为空白.我需要做一些特殊的事情来将值分配给$ count吗?

Two lines should be printed, and each should have the same value... but they don't. The first print statement [the result of ls -d foo* | wc -l] has the correct value, the second print statement is incorrect, it always prints blank. Do I need to do something special to assign the value to $count?

我在做什么错了?

谢谢

推荐答案

#!/bin/sh

while read line; do
  echo Begin $line
  ssh $USER@$line << \ENDSSH
  ls -d foo* | wc -l 
  count=`ls -d foo* | wc -l`
  echo $count
ENDSSH
done < $1

脚本的唯一问题是，当未引用heredoc令牌时，shell会进行变量扩展，因此$count在您的远程命令交付之前已由您的本地shell进行了扩展...

The only problem with your script was that when the heredoc token is not quoted, the shell does variable expansion, so $count was being expanded by your local shell before the remote commands were shipped off...

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