kyrose/specialbash.md

## specialbash.md

      
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              specialbash.md
            
          
    Special parameters


parameter
definition


$0
Returns name of shell/shell-script currently being executed


$n
Positional parameters


$*
All positional parameters as a single string


$@
List of all positional parameters


$#
Number of positional parameters


$?
Exit status of last executed command


$$
Process ID of the shell


$!
Process ID of last background process


$_
Last argument to the previous command


$-
Returns entire set of options specified at shell launch
parameter	definition
`$0`	Returns name of shell/shell-script currently being executed
`$n`	Positional parameters
`$*`	All positional parameters as a single string
`$@`	List of all positional parameters
`$#`	Number of positional parameters
`$?`	Exit status of last executed command
`$$`	Process ID of the shell
`$!`	Process ID of last background process
`$_`	Last argument to the previous command
`$-`	Returns entire set of options specified at shell launch