Teljes szöveg:
- Szkriptelés
- rás [[https://stackoverflow.com/questions/3173131/redirect-copy-of-stdout-to-log-file-from-within-bash-... es a difference only when parameter has been declared and is null.| |${parameter-default},${parameter:-... es a difference only when parameter has been declared, but is null.| |${parameter=default},${parameter:... s a difference only when $parameter has been declared and is null.| |${parameter+alt_value},${parameter