Best answer: How do I write an expect script in Linux?

How do I run an expect script in Linux?

The first line defines the expect command path which is #!/usr/bin/expect . On the second line of code, we disable the timeout. Then start our script using spawn command. We can use spawn to run any program we want or any other interactive script.

How use Linux expect?

The Linux expect command takes script writing to an entirely new level. Instead of automating processes, it automates running and responding to other scripts. In other words, you can write a script that asks how you are and then create an expect script that both runs it and tells it that you’re ok.

How do I run a shell script in expect?

Expect Command

  1. The spawn command starts a script or a program like the shell, FTP, Telnet, SSH, SCP, and so on.
  2. The send command sends a reply to a script or a program.
  3. The Expect command waits for input.
  4. The interact command allows you to define a predefined user interaction.

What is expect in Linux?

Expect is a program that “talks” to other interactive programs according to a script. Following the script, Expect knows what can be expected from a program and what the correct response should be. … It behaves just like Expect and Tk’s wish. Expect can also be used directly in C or C++ (that is, without Tcl).

What is expect script?

Expect scripts can be used to automate multiple CLI commands in batch mode. Expect is a UNIX scripting and testing utility which can be used with SSH-based applications, like the Oracle VM CLI. Expect scripts can have any file name suffix you like, though they generally have an .exp extension.

How do I expect a bash script?

How to Use Expect In Bash Script

  1. Step 1 : Create a new file. vi expectcmd.
  2. Step 2 : Copy and paste below given content in file. …
  3. Step 3: Make your file executable by owner of file , run the given below command. …
  4. Step 4: Give commands as argument along with expectcmd script.

How do you install expect on Linux?

Detailed Instructions:

  1. Run update command to update package repositories and get latest package information.
  2. Run the install command with -y flag to quickly install the packages and dependencies. sudo apt-get install -y expect.
  3. Check the system logs to confirm that there are no related errors.

How do you check if expect is installed in Linux?

Use pacman command to check if the given package is installed or not in Arch Linux and its derivatives.

What type of terminal does CLI expect?

Expect is used to automate control of interactive applications such as Telnet, FTP, passwd, fsck, rlogin, tip, SSH, and others. Expect uses pseudo terminals (Unix) or emulates a console (Windows), starts the target program, and then communicates with it, just as a human would, via the terminal or console interface.

What is Interact in expect?

Interact is an Expect command which gives control of the current process to the user, so that keystrokes are sent to the current process, and the stdout and stderr of the current process are returned.

How do you end an expect script?

close would close the connection to the other process, so in sense acting as the reverse of expect eof . Again, your script could continue after this. Using close just before exiting the script doesn’t do much, as an exit will also implicitly close . Then there’s exit that exits your script.

How do you use variables in expect script?

#!/usr/bin/expect set host [lindex $argv 0] set user [lindex $argv 1] set pass [lindex $argv 2] set action [lindex $argv 3] set path [lindex $argv 4] puts “Starting….” puts “”$action”” spawn sftp $user@$host expect “password:” send “$passr” expect”sftp>” send “cd $pathr” if {$action == “TEST”} { # Do something } …

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