Change the cd into a function to run the real cd and run your script afterward.

cd () { if builtin cd ${1:+"$@"} && [ -r ./set_foo_env.sh ]; then . ./set_foo_env.sh fi } 

This assumes that:

1. The set_foo_env.sh would be specific to a single directories, and
2. That set_foo_env.sh should change the existing shell's environment.

If you want path-based with a global file, then look at the question that manatwork mentioned ( Execute bash scripts on entering a directory).

Change the cd into a function to run the real cd and run your script afterward.

cd () { if builtin cd ${1:+"$@"} && [ -r ./set_foo_env.sh ]; then . ./set_foo_env.sh fi } 

This assumes that:

1. The set_foo_env.sh would be specific to a single directories, and
2. That set_foo_env.sh should change the existing shell's environment.

If you want path-based with a global file, then look at the question that manatwork mentioned ( Execute bash scripts on entering a directory).

Change the cd into a function to run the real cd and run your script afterward.

cd () { if builtin cd ${1:+"$@"} && [ -r ./set_foo_env.sh ]; then . set_foo_env.sh fi } 

This assumes that:

1. The set_foo_env.sh would be specific to a single directories, and
2. That set_foo_env.sh should change the existing shell's environment.

If you want path-based with a global file, then look at the question that manatwork mentioned ( Execute bash scripts on entering a directory).

Change the cd into a function to run the real cd and run your script afterward.

cd () { if builtin cd ${1:+"$@"} && [ -r ./set_foo_env.sh ]; then . ./set_foo_env.sh fi } 

This assumes that:

1. The set_foo_env.sh would be specific to a single directories, and
2. That set_foo_env.sh should change the existing shell's environment.

If you want path-based with a global file, then look at the question that manatwork mentioned ( Execute bash scripts on entering a directory).