Using ExpectIt for Exit Value

[rabbi....@gmail.com]

Hi There,

This is my first time using expectit - and I am trying to write a code in groovy which connects to a remote ssh Session and execute a few commands. I have 2 sets of questions.

1) After Using jsch to create the session, and defining the ExpectBuilder; the script just hangs after the prompt.

channel.connect()
//Should we be using regular expression to get the prompt, could you provide some examples ? And is this necessary before a command is sent ?
expect.expect(contains("[PROMPT]"))
expect.sendLine("pwd")

2) Would like to confirm the the command send via "expect.sendLine" actually executed. Is there a way we can capture the exit value of the command. For example

def exitValue = "mkdir foo".execute().exitValue()
if(!exitValue)
//do something

Your help in this matter is highly appreciated. Thank you

[Alexey Gavrilov]

Hi!

See my answers below.

1) After Using jsch to create the session, and defining the ExpectBuilder; the script just hangs after the prompt.

If the script hangs then the output  does not probably match the prompt.

channel.connect()
//Should we be using regular expression to get the prompt, could you provide some examples ? 

It depends on the actual prompt string which is usually set by the user profile variable [1]. For example, expect.expect(contains(“#”)) or expect.expect(regexp(“bash-.+\$”)) could work for you.

And is this necessary before a command is sent ?

It is not always necessary but it guaranties that the remote server is ready to accept commands. 

expect.expect(contains("[PROMPT]"))
expect.sendLine("pwd”)

2) Would like to confirm the the command send via "expect.sendLine" actually executed. Is there a way we can capture the exit value of the command. For example 

def exitValue = "mkdir foo".execute().exitValue()
if(!exitValue)
//do something 

The only way to confirm that the command has been executed is to await for its output or for the command prompt. You can try something like:

expect.expect(contains(PROMPT));

expect.sendLine("mkdir foo; echo $?”);

int exitValue = Integer.parseInt(expect.expect(contains(PROMPT)).getBefore());

Alternatively, you can consider running JSch in the remote ‘exec’ mode [2] without ExpectIt and retrieve the exit code value from the channel exit status Channell#getExitStatus [3].

Regards,

Alexey

[1]

https://en.wikipedia.org/wiki/Command-line_interface#Command_prompt

[2]

http://www.jcraft.com/jsch/examples/Exec.java.html

[3]

http://epaul.github.io/jsch-documentation/simple.javadoc/com/jcraft/jsch/Channel.html#getExitStatus%28%29

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[ervb.s...@gmail.com]

what is this PROMPT, is this PROMPT is constant or method in Java??