dollar-sign

$1, $2, $3, … are the positional parameters. “$@” is an array-like construct of all positional parameters, {$1, $2, $3 …}. “$*” is the IFS expansion of all positional parameters, $1 $2 $3 …. $# is the number of positional parameters. $- current options set for the shell. $$ pid of the current shell (not … Read more