Problem in command execution in Ruby

Question

I am executing commands in Ruby using system command, but I am facing the following problem:

I load an environment using the command Environment.bat, and I want to execute the second command which makes use of the environment that I have set up successfully in the previous command. However, it seems as if loading the environment earlier does not have any effect at all.

How to solve this problem so that the environment that I load in the ruby shell is used in the commands that I execute afterwards.

what does 'environment' look like? Is that a set of system variables or something? It might really help if you show some code — Vlad Khomich
– Vlad Khomich, Commented Apr 21, 2011 at 9:58

maerics · Accepted Answer · 2011-04-21 10:14:34Z

2

You might need to "chain" your two commands so that they get executed in the same system subshell. That is, if you're executing two commands in separate ruby "system" calls then they are modifying the environments of separate child programs which are not directly related.

system("env.bat") # Executes in child process 1.
system("program.exe") # Executes in child process 2.

In the above example, "program.exe" wouldn't know if "env.bat" had changed the environment by adding a new environment variable (for example) since they run in separate, unrelated processes.

system("env.bat && program.exe") # Both in the same child process.

But in this example the two commands are run in the same subshell process, one after the other, as long as "env.bat" doesn't exit with an error code. In this case "program.exe" would have access to any new environment variables set by "env.bat".

edited Apr 21, 2011 at 10:14

answered Apr 21, 2011 at 10:09

maerics

157k47 gold badges277 silver badges299 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Problem in command execution in Ruby

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related