Redirect output from bash script

Question

I have a current bash script. echo will display all results when cmd has been finished. But I want in real time see output coming line by line when script is in execution process. How can I achieve that?

#!/bin/bash
echo $(docker build -t goapp -f deployments/dev/Dockerfile .)

docker build -t goapp -f deployments/dev/Dockerfile . >> someFile.log and tail -f someFile.log may do the trick — Fernando Martín Besteiro, Commented Sep 21, 2015 at 20:54

chepner · Accepted Answer · 2015-09-21 21:01:49Z

2

docker already prints its output to standard output; that's why you can capture it with $(...) and pass it as arguments to echo. Just run docker:

#!/bin/bash
docker build -t goal -f deployments/dev/Dockerfile .

edited Sep 21, 2015 at 21:01

answered Sep 21, 2015 at 20:57

chepner

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it stream all output if I execute that cmd manually in terminal but if I wrap it in bash .sh script it prints it only when cmd has been finished.
– Wild Goat
Commented Sep 21, 2015 at 21:00
Are you still wrapping it in echo $(...)? That's the part I'm saying is unnecessary.
– chepner
Commented Sep 21, 2015 at 21:01

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