How to execute bash variable with double quotes and get the output in realtime-CodePudding

I have a variable that has a command that I want to run. It has a bunch of double-quotes. when I echo it, it looks beautiful.

I can copy-paste it and run it just fine.

I tried simply $cmd, but it doesn't work. I get an error as if the command is malformed.

I then tried running it via eval "$cmd" or similarly, bash -c "$cmd", which works, but I don't get any output until the command is done running.

Example with bash -c "$cmd":

This runs the command, BUT I don't get any output until the command is done running, which sucks and I'm trying to fix that:

cmd="docker run -v \"$PROJECT_DIR\":\"$PROJECT_DIR\" \
    -v \"$PPI_ROOT_DIR/utilities/build_deploy/terraform/modules/\":/ppi_modules \
    --workdir \"$PROJECT_DIR/terraform\" \
    --env TF_VAR_aws_account_id=$AWS_ACCOUNT_ID \
    --env TF_VAR_environment=${ENVIRONMENT} \
    --env TF_VAR_region=${AWS_DEFAULT_REGION:-us-west-2} \
    ${OPTIONAL_AWS_ENV_VARS} \
    ${CUSTOM_TF_VARS} \
    ${TERRAFORM_BASE_IMAGE} \
    init --plugin-dir=/.terraform/providers \
        -reconfigure \
        -backend-config=\"bucket=${AWS_ACCOUNT_ID}-tf-remote-state\" \
        -backend-config=\"key=${ENVIRONMENT}/${PROJECT_NAME}\" \
        -backend-config=\"region=us-west-2\" \
        -backend-config=\"dynamodb_table=terraform-locks\" \
        -backend=true"
# command output looks good. I can copy and paste it and run it my terminal too.
echo $cmd
# Running the command via bash works, 
# but I don't get the output until the command is done running, 
# which is what I'm trying to fix:
bash -c "$cmd"

Here is an example using bash array. It prints it to screen perfectly, but just like running it like $cmd, it throws an error as if the command is malformed:

cmd=(docker run -v \"$PROJECT_DIR\":\"$PROJECT_DIR\" \
    -v \"$PPI_ROOT_DIR/utilities/build_deploy/terraform/modules/\":/ppi_modules \
    --workdir \"$PROJECT_DIR/terraform\" \
    --env TF_VAR_aws_account_id=$AWS_ACCOUNT_ID \
    --env TF_VAR_environment=${ENVIRONMENT} \
    --env TF_VAR_region=${AWS_DEFAULT_REGION:-us-west-2} \
    ${OPTIONAL_AWS_ENV_VARS} \
    ${CUSTOM_TF_VARS} \
    ${TERRAFORM_BASE_IMAGE} \
    init --plugin-dir=/.terraform/providers \
        -reconfigure \
        -backend-config=\"bucket=${AWS_ACCOUNT_ID}-tf-remote-state\" \
        -backend-config=\"key=${ENVIRONMENT}/${PROJECT_NAME}\" \
        -backend-config=\"region=us-west-2\" \
        -backend-config=\"dynamodb_table=terraform-locks\" \
        -backend=true)

echo "${cmd[@]}"

"${cmd[@]}"

How can I execute a bash variable that has double-quotes, but run it so I get the output in realtime, just as if I executed via $cmd (which doesn't work)

Similar to these questions, but my question is to run it AND get the output in realtime:

Execute command containing quotes from shell variable

Bash inserting quotes into string before execution

bash script execute command with double quotes, single quotes and spaces

CodePudding user response：

In your array version, double quotes escaped by a backslash become part of the arguments, which is not intended.

So removing backslashes should fix the issue.