shell-parameter-expansion
| Variable | Description |
|---|---|
$$ | This is the process ID of the script itself. |
$0 | The first parameter to the shell, which is typically the path of the shell itself. If this parameter starts with - then the shell is assumed to be a Login Shell. |
$- | The flags that were set for the shell, such as i for 'interactive'. |
$0 | The first parameter to the shell, which is typically the path of the shell itself. |
$1 | The first parameter |
$2 | The second parameter |
${11} | The 11th parameter - if the parameter is more than one digit you must surround it with braces |
$# | The number of parameters |
$@ | The full set of parameters as an array |
$* | The full set of parameters as a string separated by the first value in the $IFS variable |
${@:start:count} | A subset of 'count' parameters starting at parameter number 'start' |
$? | The status code of the most recently called command. |
TODO
Need to update Chapter 19 to link to this.
