Excuting an NPM script conditionally based on a bash .sh script

Question

I'm trying to make a bash script that asks me a question and, if I respond y, executes the subsequent scripts; but, if I respond n, it terminates "ALL" of the subsequent script.

I already created the bash script, but when I respond with n, the following scripts, build and anotherBashScript, are executed.

package.json

  "scripts": {
    "prebuild": "./ask.sh",
    "build": "vite build",
    "postbuild": "./anotherBashScript.sh"
  },

ask.sh

read -p "Are you sure you want to build the app? (y/n) " yn

case $yn in 
    [yY] ) echo Building the app...
        break;;

    [nN] ) echo exiting...;
      
        exit 1;;

    * ) echo invalid response;;
esac

The build script by definition will always follow the prebuild step. A way of achieving what you want is to have a file track the exit code and then wrap the vite build command in another bash script that first checks the file for the exit code before proceeding accordingly. — Raman Sailopal
– Raman Sailopal, Commented Aug 16, 2022 at 13:29

Raman Sailopal · Accepted Answer · 2022-08-18 09:28:37Z

1

The build script by definition will always follow the prebuild step. A way of achieving what you want is to have a file track the exit code and then wrap the vite build command in another bash script that first checks the file for the exit code before proceeding accordingly.

Example, using status.txt to track status:

   "scripts": {
   "prebuild": "./ask.sh",
   "build": "./build.sh",
   "postbuild": "./anotherBashScript.sh"
 },

ask.sh

read -p "Are you sure you want to build the app? (y/n) " yn

case $yn in 
   [yY] ) echo Building the app...
       break;;

   [nN] ) echo exiting...;
  
       echo 1 > status.txt;;

   * ) echo invalid response;;
 esac

build.sh

 if [[ "$(cat status.sh)" == "1" ]]
 then
       exit 1
 else
       vital build
       if [[ "$?" == "1" ]]
       then
            echo 1 > status.txt
            exit 1
       fi 
  fi

anotherBashScript.sh

if [[ "$(cat status.sh)" == "1" ]]
 then
       exit 1
 else
       ...
fi

answered Aug 18, 2022 at 9:28

Raman Sailopal

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1 Comment

Youssef Zidan Over a year ago

Thanks, But your script is flipped. I used your answer to create it.

Youssef Zidan · Accepted Answer · 2022-08-23 12:00:23Z

Thanks Raman Sailopal.

I adapted your suggestion and applied it to write the following script, and it was successful!

package.json


  "scripts": {
   "prebuild": "./ask.sh",
   "build": "./build.sh",
   "postbuild": "./anotherBashScript.sh"
 },

ask.sh

#! /bin/bash

read -p "Are you sure? (y/n) " yn

case $yn in
[yY])
    echo Building the app...
    echo 1 >status.txt
    ;;
[nN])
    echo exiting...
    ;;
*) echo invalid response ;;
esac

build.sh

#! /bin/bash

if [[ "$(cat status.txt)" == "1" ]]; then
  yarn run vite build
  echo 1 >status.txt
  exit 1

else
  exit 1
fi

anotherBashScript.sh

#! /bin/bash

if [[ "$(cat status.txt)" == "1" ]]; then
      # do stuff
      rm status.txt


else
      exit 1
      rm status.txt
fi

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