.
é um bash integrado, igual a source
, o que faz é ler e executar comandos de FILENAME no shell atual. Digite help .
ou help source
no seu terminal para verificar a documentação completa.
Documentação completa:
.: . filename [arguments]
Execute commands from a file in the current shell.
Read and execute commands from FILENAME in the current shell. The
entries in $PATH are used to find the directory containing FILENAME.
If any ARGUMENTS are supplied, they become the positional parameters
when FILENAME is executed.
Exit Status:
Returns the status of the last command executed in FILENAME; fails if
FILENAME cannot be read.