source
Execute commands in the current shell environment
TLDR
Evaluate contents of a given file
$ source [path/to/file]
Evaluate contents of a given file (alternatively replacing source with .)
$ . [path/to/file]
SYNOPSIS
source filename [arguments]
DESCRIPTION
source reads and executes commands from a file in the current shell environment. Unlike running a script, source doesn't create a subshell, so variables and functions defined in the file remain available in the current shell.
CAVEATS
Shell built-in. File must be readable. Changes persist in current shell. Equivalent to '.' command.
