bash 期望将写入文件
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expect puts write to file
提问by Rusty Lemur
I am writing an expect script that will ssh into several IPs to test their connectivity. I would like to include a "puts" statement to write the result of each test to a file on the machine calling the script. Although I think I'm following the manual for puts to write to a file, it only writes to stdout. Please see the script below. The end result is that the file is created on the local machine, but no output is directed to it. Instead, the output goes to stdout.
我正在编写一个 expect 脚本，它将通过 ssh 连接到多个 IP 以测试它们的连接性。我想包含一个“puts”语句，将每个测试的结果写入调用脚本的机器上的文件中。虽然我认为我正在遵循 puts 写入文件的手册，但它只写入 stdout。请参阅下面的脚本。最终结果是文件是在本地机器上创建的，但没有输出定向到它。相反，输出到标准输出。
#!/bin/bash
USER=user
PASSWORD=password
IPSTART=12.34.56.
OUTFILE="TEST.log"
PROMPT="#"
for IPEND in `seq 200 231`
do
expect -c "
set timeout 3
set chan [open $OUTFILE w]
spawn ssh $USER@$IPSTART$IPEND
expect -re \".*ssword.*\" {send \"$PASSWORD\n\"}
expect {
-re \".*Are you sure you want to continue connecting.*\" {send \"yes\n\"; exp_continue}
-re \".*$PROMPT.*$.*\" {puts $chan \"$IPSTART$IPEND\n\"; send \"exit\n\"}
}
close $chan
"
done
I'm wondering if there might be an issue with the quoting, but I can't figure it out.
我想知道引用是否有问题，但我无法弄清楚。
For reference, this is the example from http://www.tcl.tk/man/tcl8.4/TclCmd/puts.htm
作为参考，这是来自http://www.tcl.tk/man/tcl8.4/TclCmd/puts.htm的示例
set chan [open my.log a]
set timestamp [clock format [clock seconds]]
puts $chan "$timestamp - Hello, World!"
close $chan
回答by Janito Vaqueiro Ferreira Filho
You're probable problem was that you were using double-quotes. Therefore you should escape the literal $that will be passed to expect (ie. \$chan):
你可能的问题是你使用了双引号。因此，您应该转义$将传递给 expect （即。\$chan）的文字：
#!/bin/bash
USER=user
PASSWORD=password
IPSTART=12.34.56.
OUTFILE="TEST.log"
PROMPT="#"
for IPEND in `seq 200 231`
do
expect -c "
set timeout 3
set chan [open $OUTFILE w]
spawn ssh $USER@$IPSTART$IPEND
expect -re \".*ssword.*\" {send \"$PASSWORD\n\"}
expect {
-re \".*Are you sure you want to continue connecting.*\" {send \"yes\n\"; exp_continue}
-re \".*$PROMPT.*$.*\" {puts $chan \"$IPSTART$IPEND\n\"; send \"exit\n\"}
}
close $chan
"
done
回答by Rusty Lemur
Well, I coulnd't figure out how to do it in bash, so I changed the whole script to expect. It works now.
好吧，我不知道如何在 bash 中做到这一点，所以我将整个脚本更改为预期。它现在有效。
#!/bin/expect
set USER "user"
set PASSWORD "password"
set IPSTART "12.34.56."
set OUTFILE "TEST.log"
set PROMPT "#"
set CHAN [open $OUTFILE w]
for {set IPEND 200} {$IPEND <= 231} {incr IPEND} {
spawn ssh $USER@$IPSTART$IPEND
set timeout 3
expect {
-re ".*ssword.*" {send "$PASSWORD\n"}
timeout {puts $CHAN "$IPSTART$IPEND does not work"}
}
expect {
-re ".*Are you sure you want to continue connecting.*" {send "yes\n"; exp_continue}
-re ".*$PROMPT.*$.*" {puts $CHAN "$IPSTART$IPEND works"; send "exit\n"}
}
}
close $CHAN
