execute docker commands from bash file

Question

How can one run docker commands from a bash (sh) script? I am trying to run:

#!/bin/bash
container= $(docker ps --format "{{.ID}} {{.Names}}" -a | grep testServer | awk '/'$imid'/ { print $1 }');
echo $container

but I get a blank for the container.

TIA

Sorry - it is a leftover. The goal was to get the container name. — Casey Harrils, May 15 '17 at 16:53
I'd try with a simple docker command hardcoded until you get the printing working as expected. Then start doing clever grep/awk magic. — captncraig, May 15 '17 at 16:54
Do you really have a space between `=` and `$` in your code, or is that a typo? — chepner, May 15 '17 at 17:05

score 1 · Answer 1 · edited May 23 '17 at 12:03

1

It looks like the container id is printed to sterr and the $() construct only captures stdout.

As per this comment, you can use 2>&1 to redirect stderr to stdout, but I'm not quite sure how to work that into your snippet with the grep/awk chaining going on.

edited May 23 '17 at 12:03

Community

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answered May 15 '17 at 16:53

captncraig

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score 0 · Answer 2 · edited May 17 '17 at 09:05

0

Did some testing - as suggested - and found that the following works from bash.

#!/bin/bash
container=$(docker ps --format "{{.ID}} {{.Names}}" -a | grep testServer  | awk '/'$imid'/ { print $1 }')
echo $container
if [[ $container = *[!\ ]* ]]; then
        echo "found something";
else
        echo "DID NOT find anything";
fi

I guess I just had to play around with it some more.

edited May 17 '17 at 09:05

Pang

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answered May 15 '17 at 17:04

Casey Harrils

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Maybe a saner way to do it. Unless you need to capture the exact container id to stop or kill it later. – captncraig May 15 '17 at 17:08
Yes - I need to use the ID for later - so it works as needed – Casey Harrils May 15 '17 at 18:37

execute docker commands from bash file

2 Answers2