Handle multiple Spawn process in expect script

问题:

Here is my use case for expect script ( one of few i have)

I want to run multiple sed command over ssh. Its like pre-build environment setup. I want to run something like this :-

#!/usr/bin/expect set timeout -1  spawn -noecho bash -c "ssh -t user@host 'sed -i <some_stuff1> <file1>'" spawn -noecho bash -c "ssh -t user@host 'sed -i <some_stuff2> <file2>'" spawn -noecho bash -c "ssh -t user@host 'sed -i <some_stuff3> <file3>'"  expect {   -re ".*sword.*" {      exp_send "$env(PASS_WORD)\n"      exp_continue   } } 

But only last sed command will execute. 1st and 2nd will be skipped.

What could be the hidden gem i am missing?

Here is what i looked at so far but not helpful

Handle multiple statement in expect script

Expect script: How to handle two processes?

Handling multiple process simuntaneously - safari online book

回答1:

You don't really need multiple (means parallel) spawn here.

#!/usr/bin/expect  set timeout 60  set cmds [list "ssh host1 ..." "ssh host2 ..." "ssh host3 ..."]  foreach cmd $cmds {     spawn -noecho bash -c $cmd     expect {         -nocase "password" {             exp_send "$env(PASS_WORD)\"             exp_continue         }         eof { wait } ; # at this time the last spawn'ed process has exited     } } 

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