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Disclaimer: I am an idiot on this subject I recently found out that you can’t easily spawn a shell and then send commands to it. It’s doable with tmux commands

by kuwze 8y ago

Disclaimer: I am an idiot on this subject I recently found out that you can’t easily spawn a shell and then send commands to it. It’s doable with tmux commands, but you’d think it would be easier. I just wanted to write something that locates npm/virtualenv stuff in bash, nothing fancy.

lanstin 8y ago
I think you want expect.
- kuwze 8y ago
  wow I feel like an idiot, thank you.
  - xorcist 8y ago
    No, you are most likely not, but you are also not likely looking for expect. It sounds like you are doing something simple in a very roundabout way. Explain instead the intended outcome and many people will be happy to help.
gavrif 8y ago
Why can't you run a shell script?
anyfoo 8y ago
"expect" was mentioned, but what are you actually trying to do that cannot be solved with a shell script, either executed the normal way or sourced in at the start of a new shell?
- kuwze 8y ago
  wow I feel like an idiot, thank you.
0xEFF 8y ago
echo ls | bash
- earenndil 8y ago
  If you have echo and a pipe, then you're most likely already in a shell, no?
- yjftsjthsd-h 8y ago
  It even seems to work with named pipes, although in my first test it exited after the first command (I suspect I'm accidentally sending a EOF when I echo the command in). mkfifo testpipe1 <testpipe1 bash # in separate window echo ls > testpipe1
adrianmonk 8y ago
What do you mean by locates?
Groxx 8y ago
Just to join in the "I feel like an idiot" fun: yea, I've used tmux to do this too. First I've heard of `expect`. TIL. Bash is pretty bad at helping you discover how to do things.
pjc50 8y ago
A distinction you may be having trouble with, because it's kind of hidden from the user, is the difference between a shell and a "pty" (pseudo teletype). You certainly can spawn a shell and send it commands, but because it doesn't have a pty the input is treated very differently. That's what you get setup for you by running tmux, screen, expect, xterm, ssh etc. (Bonus: https://askubuntu.com/questions/481906/what-does-tty-stand-for/482244#482244 https://askubuntu.com/questions/481906/what-does-tty-stand-f... )

by kuwze 8y ago

lanstin 8y ago

I think you want expect.

kuwze 8y ago
wow I feel like an idiot, thank you.
- xorcist 8y ago
  No, you are most likely not, but you are also not likely looking for expect. It sounds like you are doing something simple in a very roundabout way. Explain instead the intended outcome and many people will be happy to help.

gavrif 8y ago

Why can't you run a shell script?

anyfoo 8y ago

"expect" was mentioned, but what are you actually trying to do that cannot be solved with a shell script, either executed the normal way or sourced in at the start of a new shell?

kuwze 8y ago
wow I feel like an idiot, thank you.

0xEFF 8y ago

echo ls | bash

earenndil 8y ago
If you have echo and a pipe, then you're most likely already in a shell, no?
yjftsjthsd-h 8y ago
It even seems to work with named pipes, although in my first test it exited after the first command (I suspect I'm accidentally sending a EOF when I echo the command in). mkfifo testpipe1 <testpipe1 bash # in separate window echo ls > testpipe1

adrianmonk 8y ago

What do you mean by locates?

Groxx 8y ago

Just to join in the "I feel like an idiot" fun: yea, I've used tmux to do this too. First I've heard of `expect`. TIL. Bash is pretty bad at helping you discover how to do things.

pjc50 8y ago

A distinction you may be having trouble with, because it's kind of hidden from the user, is the difference between a shell and a "pty" (pseudo teletype). You certainly can spawn a shell and send it commands, but because it doesn't have a pty the input is treated very differently. That's what you get setup for you by running tmux, screen, expect, xterm, ssh etc. (Bonus: https://askubuntu.com/questions/481906/what-does-tty-stand-for/482244#482244 https://askubuntu.com/questions/481906/what-does-tty-stand-f... )