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Re: Sending Command Pipeline to a detached Screen

From: aws backup
Subject: Re: Sending Command Pipeline to a detached Screen
Date: Wed, 30 Nov 2016 15:53:54 +0200

Thank you :-) Great! It works perfectly.

On 30 Nov 2016, at 09:15, Andrew King <address@hidden> wrote:


screen -dmS Screen-Name  /bin/bash -c "Command1 | tee logfile | tee >(mail -s 'subject' address@hidden")

On Wed, 30 Nov 2016, 00:26 aws backup, <address@hidden> wrote:

now I built following pipe example:

screen -dmS Screen-Name  /bin/bash -c "Command1 | tee logfile | mail -s 'subject' address@hidden"

Works fine so fare that I have the log file and get a notification email with the log as well.
But now nothing appears anymore in the screen because it pipes it to the mail.

Any suggestion how to get the stdout back to the screen session and still having the log and the email?

Thank you.


On 23 Nov 2016, at 06:31, Neal Fultz <address@hidden> wrote:

screen -d -m -S Screen-Name
screen -S Screen-Name -p 0 -X stuff "Command1; Command2  | Command3 && Command4"$(echo -ne '\015')

This first creates a screen session running a shell, most likely bash. Second, it sends some commands to the terminal input using stuff. In this case, you could append the `exit` command to your chain of commands to make the shell exit.

Alternatively, you could instead use a single screen command to start a bash shell in non-interactive mode, and provide the commands to it instead of stuffing them through screen:
screen -dRS Screen-Name /bin/bash -c "echo 1; echo a | sed s/a/A/; echo 2 > /tmp/hooha.txt"

This will automatically close when finished, and avoids stuff entirely.

On Tue, Nov 22, 2016 at 2:37 PM, aws backup <address@hidden> wrote:
Ok I figured out the correct syntax.

screen -d -m -S Screen-Name; screen -S Screen-Name -p 0 -X stuff "Command1; Command2  | Command3 && Command4"$(echo -ne '\015')

$(echo -ne '\015') starts the command pipe in the screen session. But now the screen is not terminating anymore after the command pipe has finished as it did before when it only received one command. Therefore the script runs into an error when it runs the next time because it makes a new screen session with the same name and then it does not know to which screen session to send the command. 

Why is it not terminating the session anymore? Is there a command which I can send there?
Any other suggestion how to solve this problem?

Thank you.

On 19 Nov 2016, at 14:19, Colin Richardson <address@hidden> wrote:

Oh, there is.a trick to that too. I will need to check on my raspberry pi, but I think you can send a ^M at the end and it acts like the user pressing ENTER. I don't remember the exact char off the top of my head and I am out and about shipping at the moment, but shoulder be able to google the command IDF is not M.

On 19 Nov 2016 11:54 am, "aws backup" <address@hidden> wrote:
Hi Colin,

thank you. I tried but nothing arrived in the screen or it did arrive but didn't start.
What is the exact syntax? Can I start the screen and send the commands in one command or do I have to start the screen in one command and in the next command I send the pipeline? I tried it like this:

screen -d -m -S Screen-Name; screen -S Screen-Name -p 0 -X stuff "Command1; Command2  | Command3 && Command4"

How is it with quotations in the command pipe? Can they interfere? For example:  -X stuff "command "$f" | command2 "text""

Thank you.

On 19 Nov 2016, at 12:07, Colin Richardson <address@hidden> wrote:

Have u tried -X stuff "command | command2" with the quotes?

On 19 Nov 2016 7:36 am, "aws backup" <address@hidden> wrote:

I would like to start a screen session in detached mode and send a command pipeline to it. How can I do this?
With my approach

screen -d -m -S Name Command1; Command2  | Command3 && Command4

only Command1 is send to the screen.

Thank you.

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