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environmental-variables.md

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Setting environment variables

The terminal is a stateful system - it has a whole bunch of variables.
You can see these using env (the equivalent of dir() in Python)

We can set a variable using:

$ zz=1

If you want to see what value this variable is holding (note the $ - this is always used):

$ echo $zz

But these variables will not be inherited by sub processes - to get this we need to use export. You will always see export used in the shell config scripts (i.e. .bash_rc), and the simpler variable assignment in shell scripts.

$ export zz=2

PATH

Locations the shell checks when you type a command. You can think of adding a location to your PATH as installing a program.

echo $PATH | tr ":" "\n"

export PATH=$PATH:$SPARK_HOME/bin

A common pattern you will see in install scripts

echo 'export PATH=$PATH:$SPARK_HOME/bin' >> ~/.bashrc