问题
I have the following bash file which should create a screen, go to a directory and then start a node script:
screen -S shared // 1
cd /home/nodejsapp // 2
node start.js app.js // 3
The problem is, after executing 1, I indeed see the screen 'shared', but 2 & 3 will execute on the previous terminal, not on the screen 'shared'.
How can I achieve that commands 2 and 3 will be executed on the current screen?
回答1:
You may create a detached screen and then send commands to it. For example:
screen -d -m -S shared
screen -S shared -X -p 0 stuff $'cd /home/nodejsapp\n'
screen -S shared -X -p 0 stuff $'node start.js app.js\n'
If you need to attach to the screen session afterwards, then you can add one more line:
screen -S shared -r
See screen's manual for more details:
- screen options
- screen commands
回答2:
You could run a "server" as the program within screen, which reads commands to execute from the pseudoterminal which the "tty" program identifies. For instance, as I'm writing this, tty says (inside screen)
/dev/pts/2
and I can write to it by
date >/dev/pts/2
On the server side, the script would read line-by-line in a loop from the same device. (On some other systems, there are differently-named devices for each side of the pseudoterminal).
That only needs a script which starts by getting the output of "tty", writing that to a file (which a corresponding client would know of), and then the client would read commands (whether from the keyboard or a file), write them to the server via the pty device.
That's doable with just a couple of shell scripts (a little more lengthy though than the usual answer here).
来源：https://stackoverflow.com/questions/28774681/run-commands-in-screen-after-creating-one-per-bash