class method

ENV.[]=

ENV[name] = value → value

ENV.store(name, value) → value

static VALUE
env_aset_m(VALUE obj, VALUE nm, VALUE val)
{
    return env_aset(nm, val);
}

Creates, updates, or deletes the named environment variable, returning the value. Both name and value may be instances of String. See Valid Names and Values.

If the named environment variable does not exist:

If value is nil, does nothing.

Example

ENV.clear
ENV['foo'] = nil # => nil
ENV.include?('foo') # => false
ENV.store('bar', nil) # => nil
ENV.include?('bar') # => false

If value is not nil, creates the environment variable with name and value:

Example

# Create 'foo' using ENV.[]=.
ENV['foo'] = '0' # => '0'
ENV['foo'] # => '0'
# Create 'bar' using ENV.store.
ENV.store('bar', '1') # => '1'
ENV['bar'] # => '1'

If the named environment variable exists:

If value is not nil, updates the environment variable with value value:

Example

# Update 'foo' using ENV.[]=.
ENV['foo'] = '2' # => '2'
ENV['foo'] # => '2'
# Update 'bar' using ENV.store.
ENV.store('bar', '3') # => '3'
ENV['bar'] # => '3'

If value is nil, deletes the environment variable:

Example

# Delete 'foo' using ENV.[]=.
ENV['foo'] = nil # => nil
ENV.include?('foo') # => false
# Delete 'bar' using ENV.store.
ENV.store('bar', nil) # => nil
ENV.include?('bar') # => false

Raises an exception if name or value is invalid. See Invalid Names and Values.

See also .[] .assoc .clear also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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