Special variables
| Expression | Description |
|---|---|
$? |
Exit status of last task |
$! |
PID of last background task |
$$ |
PID of shell |
$0 |
Filename of the shell script |
| See Special parameters. |
Comments
| Expression | Description |
|---|---|
$? |
Exit status of last task |
$! |
PID of last background task |
$$ |
PID of shell |
$0 |
Filename of the shell script |
| See Special parameters. |