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    https://tecadmin.net › bash-special-variables

    Bash Special Variables ($0, $?, $#, $@, $$, $*) - TecAdmin

    • In bash, $0 is a special parameter that holds the name of the script or shell that is currently being executed. It is also known as the “name” or “zeroth argument” of the script.ADVERTISEMENT For example, su… See more

    $1, $2, …, $9 – Command-Line Arguments

    The $1, $2, …, $9variables contain the first nine command-line arguments passed to the script. These variables are useful for creating shell scripts that accept user input. For exampl… See more

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    $# – The Number of Command-Line Arguments

    The $#variable contains the number of command-line arguments passed to the script. This variable is … See more

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    $* – All Command-Line Arguments as A Single String

    The $*variable contains all command-line arguments passed to the script as a single string. This variable is useful for creating shell scripts that need to manipulate the entire com… See more

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    $@ – All Command-Line Arguments as An Array

    The $@variable contains all command-line arguments passed to the script as an array. This variable is useful for creating shell scripts that need to manipulate individual command-li… See more

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    $? – The Exit Status of The Last Executed Command

    The $?variable contains the exit status of the last executed command. This variable is helpful in creating shell scripts that need to handle errors or take different actions depending … See more

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    $$ – The Process ID of The Current Shell

    The $$variable contains the process ID of the current script. This variable is useful for creating shell scripts that need to manage multiple processes or create unique file names. Fo… See more

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