Question

我有以下脚本：

#!/bin/bash
echo -n "Enter user name: "
read USER
echo -n "Enter password: "
read -s PWD
cat $HOME/etc/switches.txt | while read IP SWITCH
do
  echo ${SWITCH}
  /usr/bin/expect <<EOD
# Change to 1 to Log to STDOUT
log_user 1
# Change to 1 to enable verbose debugging
exp_internal 1
# Set timeout for the script
set timeout 20
spawn ssh -l {$USER} -oCheckHostIP=no -oStrictHostKeyChecking=no -q $IP
match_max [expr 32 * 1024]
expect "Password:"
send $PWD
send "\n"
expect "#"
send "show fcip summary | grep TRNK\n"
EOD
  echo
done

当我运行它时，用户名中的反斜杠消失，给出这些结果：

Enter user name: corp\user
Enter password:
=== ss3303-m-esannw-m01a ===
spawn ssh -l corpuser -oCheckHostIP=no -oStrictHostKeyChecking=no -q 10.247.184.70
[...]

我怀疑我的问题部分是由于将我的expect脚本嵌入到bash脚本中。我尝试过使用$ USER和＆＃34; $ USER＆＃34;同样，结果相同。使用corp \\\\ user（是的，四个反斜杠！）确实有效，但不方便。我正在认真考虑使用sed或其他东西来增加反斜率，但我很想听到其他想法。

Answer 1

你可能更幸运通过环境传递变量，所以期望可以直接访问它们，而不是依靠shell将值替换为heredoc：

#!/bin/bash
read -p "Enter user name: " USER
read -sp "Enter password: " PWD
export USER PWD IP
while read IP SWITCH
do
    echo ${SWITCH}
    # the heredoc is single quoted below
    /usr/bin/expect <<'EOD'
        # Change to 1 to Log to STDOUT
        log_user 1
        # Change to 1 to enable verbose debugging
        exp_internal 1
        # Set timeout for the script
        set timeout 20
        match_max [expr {32 * 1024}]

        spawn ssh -l $env(USER) -oCheckHostIP=no -oStrictHostKeyChecking=no -q $env(IP)
        expect "Password:"
        send -- "$env(PWD)\r"
        expect "#"
        send "show fcip summary | grep TRNK\r"
        expect eof
EOD
    echo
done <$HOME/etc/switches.txt

注意：

heredoc是单引号：shell不会尝试插入变量
导出了期望代码中使用的shell变量
使用\r“按回车”作为发送命令。
整理了用户名和密码的输入
整理阅读文本文件

期望：如何生成包含反斜杠的命令？

1 个答案: