Jtdylktuy

I like to use the following format in scripts for commands with a lot of parameters (for readability):

docker run 

 --rm 

 -u root 

 -p 8080:8080 

 -v jenkins-data:/var/jenkins_home 

 -v /var/run/docker.sock:/var/run/docker.sock 

 -v "$HOME":/home 

 jenkinsci/blueocean

But, sometimes I'd like to comment one of these parameters out like:

# -p 8080:8080  

This doesn't work, as the EOL is interpreted as return and the command fails. Tried this too:

 # -p 8080:8080

which also didn't work.

Question: Is there a way to comment out the parameter, so it's still on its own line, but I'd be able to execute the script?

You can't comment out a piece of a line.

Note that since the newlines are escaped, the command is actually a single line (to the shell parser), and there's no way to comment out a part of a single line (except for at the very end).

Instead, maybe just make a copy of the original command in an editor and comment it out completely while keeping the modified command uncommented:

docker run 

 --rm 

 -u root 

 -v jenkins-data:/var/jenkins_home 

 -v /var/run/docker.sock:/var/run/docker.sock 

 -v "$HOME":/home 

 jenkinsci/blueocean



# Was originally:

# docker run 

# --rm 

# -u root 

# -p 8080:8080 

# -v jenkins-data:/var/jenkins_home 

# -v /var/run/docker.sock:/var/run/docker.sock 

# -v "$HOME":/home 

# jenkinsci/blueocean

Alternatively, if you want to occasionally delete or change the -p option and its argument (assuming bash or a shell with the same array syntax):

port=( -p 8080:8080 )



docker run 

 --rm 

 -u root 

 "${port[@]}" 

 -v jenkins-data:/var/jenkins_home 

 -v /var/run/docker.sock:/var/run/docker.sock 

 -v "$HOME":/home 

 jenkinsci/blueocean

Then just change or comment out the assignment to port.

Taking this further:

docker_run_args=(

    --rm 

    -u root 

    -p 8080:8080 

    -v jenkins-data:/var/jenkins_home 

    -v /var/run/docker.sock:/var/run/docker.sock 

    -v "$HOME":/home 

    jenkinsci/blueocean

)



docker run "${docker_run_args[@]}"

Inside the array assignment, there are no issues with commenting out a line:

docker_run_args=(

    --rm 

    -u root 

#    -p 8080:8080 

    -v jenkins-data:/var/jenkins_home 

    -v /var/run/docker.sock:/var/run/docker.sock 

    -v "$HOME":/home 

    jenkinsci/blueocean

)



docker run "${docker_run_args[@]}"

You could substitute an empty command substitution:

docker run 

 --rm 

 -u root 

 $(: -p 8080:8080 ) 

 -v jenkins-data:/var/jenkins_home 

 -v /var/run/docker.sock:/var/run/docker.sock 

 -v "$HOME":/home 

 jenkinsci/blueocean