docker run

Question

I'm trying to run MULTIPLE commands like this.

docker run image cd /path/to/somewhere && python a.py

But this gives me "No such file or directory" error because it is interpreted as...

"docker run image cd /path/to/somewhere" && "python a.py"

It seems that some ESCAPE characters like "" or () are needed.

So I also tried

docker run image "cd /path/to/somewhere && python a.py"
docker run image (cd /path/to/somewhere && python a.py)

but these didn't work.

I have searched for Docker Run Reference but have not find any hints about ESCAPE characters.

Answer 1

To run multiple commands in docker, use /bin/bash -c and semicolon ;

docker run image /bin/bash -c "cd /path/to/somewhere; python a.py"

In case we need command2 (python) will be executed if and only if command1 (cd) returned zero (no error) exit status, use && instead of ;

docker run image /bin/bash -c "cd /path/to/somewhere && python a.py"

Answer 2

For anyone else who came here looking to do the same with docker-compose you just need to prepend bash -c and enclose multiple commands in quotes, joined together with &&.

So in the OPs example docker-compose run image bash -c "cd /path/to/somewhere && python a.py"

Answer 3

If you want to store the result in one file outside the container, in your local machine, you can do something like this.

RES_FILE=$(readlink -f /tmp/result.txt)

docker run --rm -v ${RES_FILE}:/result.txt img bash -c "cat /etc/passwd | grep root > /result.txt"

The result of your commands will be available in /tmp/result.txt in your local machine.

Answer 4

You can do this a couple of ways:

1. Use the -w option to change the working directory:

   -w, --workdir="" Working directory inside the container

   https://docs.docker.com/engine/reference/commandline/run/#set-working-directory--w

2. Pass the entire argument to /bin/bash:

   docker run image /bin/bash -c "cd /path/to/somewhere; python a.py"
   

Answer 5

You can also pipe commands inside Docker container, bash -c "<command1> | <command2>" for example:

docker run img /bin/bash -c "ls -1 | wc -l"

But, without invoking the shell in the remote the output will be redirected to the local terminal.