Shell脚本ssh $ SERVER >> EOF

Question

我有一个方便的脚本,可以返回将在7天后过期或已过期的帐户.我想允许它在多个主机上运行,而不是将脚本放在每个单独的主机上,我添加for loop了ssh $SERVER >> EOF部件,但它只是从运行脚本的系统运行命令.

我相信错误是有的,ssh $SERVER >> EOF但我不确定语法看起来是否正确.

#!/bin/bash

for SERVER in `cat /lists/testlist`
do
  echo $SERVER

  ssh $SERVER >> EOF
    sudo cat /etc/shadow | cut -d: -f1,8 | sed /:$/d > /tmp/expirelist.txt
    totalaccounts=`sudo cat /tmp/expirelist.txt | wc -l`
    for((i=1; i<=$totalaccounts; i++ ))
    do
      tuserval=`sudo head -n $i /tmp/expirelist.txt | tail -n 1`
      username=`sudo echo $tuserval | cut -f1 -d:`
      userexp=`sudo echo $tuserval | cut -f2 -d:`
      userexpireinseconds=$(( $userexp * 86400 ))
      todaystime=`date +"%s"`
      if [[ $userexpireinseconds -ge $todaystime ]] ;
      then
        timeto7days=$(( $todaystime + 604800 ))
        if [[ $userexpireinseconds -le $timeto7days ]];
        then
          echo $username "is going to expire in 7 Days"
        fi
      else
        echo $username "account has expired"
      fi
    done
    sudo rm /tmp/expirelist.txt
  EOF
done

Answer 1

这里的文档是由<< EOF(或者更好的,<< 'EOF'防止这里文档的主体由(本地)shell扩展)开始的,并且结束标记必须在第1列中.

你正在做的是运行ssh并将标准输出附加到文件EOF(>>是输出重定向; <<是输入重定向).它然后(本地)运行sudo等.它可能无法执行本地文件EOF(不可执行,希望),并且可能也找不到任何其他命令.

我认为你所追求的是这一点(我现在用$(...)符号替换了脚本中的反向标记,并略微优化了服务器列表生成以与Bash一起使用):

#!/bin/bash

for SERVER in $(</lists/testlist)
do
  echo $SERVER

  ssh $SERVER << 'EOF'
    sudo cat /etc/shadow | cut -d: -f1,8 | sed '/:$/d' > /tmp/expirelist.txt
    totalaccounts=$(sudo cat /tmp/expirelist.txt | wc -l)
    for ((i=1; i<=$totalaccounts; i++))
    do
      tuserval=$(sudo head -n $i /tmp/expirelist.txt | tail -n 1)
      username=$(sudo echo $tuserval | cut -f1 -d:)
      userexp=$(sudo echo $tuserval | cut -f2 -d:)
      userexpireinseconds=$(( $userexp * 86400 ))
      todaystime=$(date +"%s")
      if [[ $userexpireinseconds -ge $todaystime ]]
      then
        timeto7days=$(( $todaystime + 604800 ))
        if [[ $userexpireinseconds -le $timeto7days ]]
        then
          echo $username "is going to expire in 7 Days"
        fi
      else
        echo $username "account has expired"
      fi
    done
    sudo rm /tmp/expirelist.txt
EOF
done

非常接近,但差异真的很重要!特别要注意,结束标记EOF位于第1列,而根本没有缩进.