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Gets the value of the environment variable env_var and assigns it to the psql variable psql_var. If env_var is not defined in the psql process's environment, psql_var is not changed. Example:

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Gets the value of the environment variable env_var and assigns it to the psql variable psql_var. If env_var is not defined in the psql process's environment, psql_var is not changed. Example:

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Gets the value of the environment variable env_var and assigns it to the psql variable psql_var. If env_var is not defined in the psql process's environment, psql_var is not changed. Example:

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Gets the value of the environment variable env_var and assigns it to the psql variable psql_var. If env_var is not defined in the psql process's environment, psql_var is not changed. Example:

\n
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Gets the value of the environment variable env_var and assigns it to the psql variable psql_var. If env_var is not defined in the psql process's environment, psql_var is not changed. Example:

\n
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