scp 完成后出现的附加提示

Question

此代码中的 scp 完成后，会出现一个附加提示。我已经尝试了几种方法来防止这种情况发生，但它仍然出现。说清楚，for循环后出现两个提示，然后程序继续。

#!/usr/bin/expect

# Set timeout
set timeout 1

# Set the user and pass
set user "user"
set pass "pass"

# Get the lists of hosts, one per line
set f [open "hosts.txt"]
set hosts [split [read $f] "\n"]
close $f

# Get the commands to run, one per line
set f [open "commands.txt"]
set commands [split [read $f] "\n"]
close $f

# Clear console
set clear "clear"

# Iterate over the hosts
foreach host $hosts {
    # Establish ssh conn
    spawn ssh $user@$host
    expect "password:"
    send "$pass\r"  

    # Iterate over the commands
     foreach cmd $commands {
        expect "$ "
        send "$cmd\r"
        expect "password:"
        send "$pass\r"
     }

    # Tidy up
    # expect "$ "
    # send "exit\r"
    # expect eof
    # send "close"
}

Answer 1

因为您的 hosts 和 commands 列表都以空字符串结尾。用 puts [list $hosts $commands]

验证

所以你发送了一个空命令，就是"hitting enter"。然后你等待密码提示，1秒后超时，继续程序。

这是由于您读取文件的方式所致：read 抓取文件内容，包括文件的结尾换行符。然后，当您在换行符上拆分字符串时，列表将包含尾随换行符后的空字符串。

改为这样做：

set commands [split [read -nonewline $f] "\n"]
# ........................^^^^^^^^^^

见https://tcl.tk/man/tcl8.6/TclCmd/read.htm

你也可以这样做

set f [open "commands.txt"]
while {[gets $f line] != -1} {
    # skip empty lines and commented lines (optional)
    if {[regexp {^\s*(#|$)} $line]} continue
    lappend commands [string trim $line]
}
close $f

scp 完成后出现的附加提示

Additional prompt appearing after scp completes

unix

expect

scp