How to print to stdout and save to variable (/dev/tty: No such device or address)?

Question

I have the following Script, the Interpreter is set to Shell: #!/bin/bash RESULT=$( | tee /dev/tty) IMAGE_ID=$(python -c "") I would like to store the result of cmd in RESULT and "print" it on screen (make it appear in the logs), but I am getting: tee: /dev/tty: No such device or address. Any ideas how to achieve this? I could just printf/echo $RESULT after the cmd finishes, but I would like to have "live" output.

Steffen Opel [Utoolity] · Answer

Interesting question - I'm not a shell scripting expert, but the following approach based on I/O Redirection to additional file descriptors seems to work well: #!/bin/bash exec 5>&1 RESULT=$( | tee /dev/fd/5) IMAGE_ID=$(python -c "") Here's a test command to demonstrate it with Bamboo's Script task: #!/bin/bash exec 5>&1 RESULT=$(for i in `seq 1 8`; do ls -l && sleep 2; done | tee /dev/fd/5)

robhit · Answer

Ok got your requirement, sorry I missed the tty part

So, the error which you are getting is very weird because I tried using the tty in my bamboo but not hitting the same error but printing output to the logs is not working when using "tty /dev/tty" (I will look into this more to debug)

however, as a workaround, I used something like below to redirect the tty output to a temp file and then cat the file. I know it will create an unnecessary file but can't help it as of now need to debug more.

RESULT=$(echo "robhit saxena" | /usr/bin/tee test-file.txt)
cat test-file.txt
new_var=$(echo $RESULT | awk '{print $1}')
echo "new var is: "$new_var

Screenshots for the reference:

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unknown · Answer

Hi Robhit,

Thanks for your reply. Please read my whole post again, I am looking for "live" output. Using the var solution will wait until the command finishes, before printing anything.

Thanks.

I just prefer python over awk to process strings. It doesn't matter for the question.