Expect +在Expect脚本中更改目录

Question

We create the following simple expect script in order to run the netdata-installer.sh

expect script is:

#!/usr/bin/expect

set timeout 20
send "cd /tmp/netdata\r"
spawn "bash netdata-installer.sh"

expect ">" { send "\r" }
interact

A few words about the netdata-installer.sh :

In order to run the - netdata-installer.sh , we need to run it from the working directory - /tmp/netdata , and this is the reason for me to use in expect the following:

send "cd /tmp/netdata\r"

Then in the expect script I use: (in order to execute ENTER , by this way we start the netdata installation)

expect ">" { send "\r" }

Until now, it seems things are perfect, but when we run the expect we get:

# ./exp.sh
spawn bash netdata-installer.sh
couldn't execute "bash netdata-installer.sh": no such file or directory
    while executing
"spawn "bash netdata-installer.sh""
    (file "./exp.sh" line 5)
You have new mail in /var/spool/mail/root

It seems that the expect script does not change the working directory to cd /tmp/netdata

So where am I wrong?

---

example when we do manual installation:

./netdata-installer.sh

  ^
  |.-.   .-.   .-.   .-.   .  netdata
  |   '-'   '-'   '-'   '-'   real-time performance monitoring, done right!
  +----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+--->


  You are about to build and install netdata to your system.

  It will be installed at these locations:

   - the daemon     at /usr/sbin/netdata
   - config files   in /etc/netdata
   - web files      in /usr/share/netdata
   - plugins        in /usr/libexec/netdata
   - cache files    in /var/cache/netdata
   - db files       in /var/lib/netdata
   - log files      in /var/log/netdata
   - pid file       at /var/run/netdata.pid
   - logrotate file at /etc/logrotate.d/netdata

  This installer allows you to change the installation path.
  Press Control-C and run the same command with --help for help.

Press ENTER to build and install netdata to your system >   <--- in this point we need to ENTER

Reference - https://www.ostechnix.com/netdata-real-time-performance-monitoring-tool-linux/

Remark - the fact that when running the netdata we need only to give "ENTER" then maybe there are other option to automate this installation ?

Answer 1

与其尝试构建一个可以读取文本并按下虚拟键的软件机器人，不如要求该程序以非交互方式进行安装：

cd /tmp/netdata && ./netdata-installer.sh --dont-wait

Answer 2

we succeeded to automate the process as the following way ( not by expect )

cd /tmp/netdata
echo -ne '\n' |  bash netdata-installer.sh

Answer 3

You write:

spawn "bash netdata-installer.sh"

That takes bash netdata-installer.sh as a single value to run, with the space, and then can't find it. Unsurprisingly. You should pass that as several arguments:

spawn bash netdata-installer.sh