我想輸出tcl緩衝區到bash變量

Question

我想輸出tcl緩衝區到bash變量，我無法讓它工作。

我希望我的例子能夠清楚我想要完成什麼。

我絕對想的TCL腳本編程

====================================== 
#!/bin/bash 
var=bash_to_tcl 

expect -c " 

puts lindex $argv 0 

expect "xx" 
send "123\n" 

set $var $expect_out(buffer) <<<< setting the variable to export to bash>>>>>> 

} 
exit 0 

< < < >> ========================= ============

echo $var "tcl_to_bash" (THIS IS WHERE I AM HAVING ISSUES) <<<<<<<<<<<<<<<<<<< 
===================================== 

我一直在尋找一些線索的例子，但找不到任何。 我得到了ecpect工作，但不能導出輸出回bash

Answer 1

子進程（expect）不能改變父（bash）的環境。通常信息通過stdio通道在進程之間傳遞：

#!/bin/bash 

# this is how bash captures the output of the expect program 
var=$(expect -c ' 
    spawn ... 
    expect "xx" 
    send "123\n" 
    # here is expect sending the info back to the parent 
    puts $expect_out(buffer) 
') 
do something with "$var"