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$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 subshell). | |
$_ most recent parameter (or the abs path of the command to start the current shell immediately after startup). | |
$IFS is the (input) field separator. | |
$? is the most recent foreground pipeline exit status. | |
$! is the PID of the most recent background command. | |
$0 is the name of the shell or shell script. |
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