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special_variables

<code> , $0 - The name of the Bash script. , $1 - $9 - The first 9 arguments to the Bash script. (As mentioned above.) , $# - How many arguments were passed to the Bash script. , $@ - All the arguments supplied to the Bash script. , $? - The exit status of the most recently run process. , $$ - The process ID of the current script. , $USER - The username of the user running the script. , $HOSTNAME - The hostname of the machine the script is running on. , $SECONDS - The number of seconds since the script was started. , $RANDOM - Returns a different random number each time is it referred to. , $LINENO - Returns the current line number in the Bash script. , </code>