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If I select any container and click CLI button, the /bin/sh shell will be opened by default. Is there any way to manually reconfigure Docker to open /bin/bash?

Hubert Jakubiak
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    Not sure if there is an option but there is a command: `docker exec -it CONTAINER_NAME bash` – anemyte Aug 02 '21 at 07:02
  • container command prompt must be installed before we can use it. you get /bin/sh terminal prompt because most of the container have this shell environment by default. you can try any other container where bash is by default like Ubuntu or some other container? i doubt that we can change that from Docker itself. – Vinod Aug 02 '21 at 07:16
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    @anemyte Yes, I know, but it's more convenient for me to click the CLI link from Docker Desktop app. – Hubert Jakubiak Aug 02 '21 at 15:11
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    Docker Desktop should just make this an option in the settings. In Visual Studio, the "Open in Terminal" option in the Containers tab uses bash by default. – Jacob Stamm Sep 22 '22 at 15:06

3 Answers3

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It will depend on the base image, you can build a custom image and add bash if it is not available. And link the create a link to use bash instead of sh

FROM <BASE_IMAGE>
RUN apk add --no-cache bash

RUN ln -sf /bin/bash /bin/sh
Vijayaraghavan Sundararaman
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6

Not exactly answer you asked for but for me it works to type bash in sh terminal. It opens bash over the sh. Only nousance is that I must exit twice.

Djoles
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I changed default shell into bash by making a new image with below Dockerfile commands.

# Dockerfile
FROM <parent image>

# make /bin/sh symlink to bash instead of dash:
RUN echo "dash dash/sh boolean false" | debconf-set-selections
RUN DEBIAN_FRONTEND=noninteractive dpkg-reconfigure dash

# set ENV to execute startup scripts
ENV ENV ~/.profile

and create a new image.

$ docker build --tag <image> .

  1. change symbolic link of /bin/sh to bash

    https://superuser.com/questions/715722/how-to-do-dpkg-reconfigure-dash-as-bash-automatically

  2. source ~/.profile file when executing /bin/sh

    Is there an alternative for .bashrc for /bin/sh?

  3. If you want to clear ENV after startup, you may add below line to the ~/.bashrc file. (Be careful not to mess up other scripts)

    unset ENV
Seongbeom Park
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