. (dot)
export
set

Execute a command script

The dot command executes a script within the shell.

. filepath

The file does not need to have executable permissions.

Permanently set an environment variable

export var=valueexport var='value ...'export var="expression"

set -flagset +flagset -o optionset +o option

Using "-" turns on the flag or option; using "+" turns it off.

One of the most beneficial uses of this command is to set an option for command line editing.