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parameter cal
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| $* : holds all command line parameters or arguments. | |
| $# : holds the number of positional parameters. | |
| $- : holds flags supplied to the shell. | |
| $? : holds the return value set by the previously executed command. | |
| $$ : holds the process number of the shell (current shell). | |
| $! : hold the process number of the last background command. | |
| $@ : holds all command line parameters or arguments. |
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