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edited Jul 7, 2017 at 9:56

$?$?-The exit status of the last command executed.

$0$0-The filename of the current script.

$#$#-The number of arguments supplied to a script.

$$$$-The process number of the current shell. For shell scripts, this is the process ID under which they are executing.

$?-The exit status of the last command executed.

$0-The filename of the current script.

$#-The number of arguments supplied to a script.

$$-The process number of the current shell. For shell scripts, this is the process ID under which they are executing.

$?-The exit status of the last command executed.

$0-The filename of the current script.

$#-The number of arguments supplied to a script.

$$-The process number of the current shell. For shell scripts, this is the process ID under which they are executing.

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answered Jul 7, 2017 at 9:21

$?-The exit status of the last command executed.

$0-The filename of the current script.

$#-The number of arguments supplied to a script.

$$-The process number of the current shell. For shell scripts, this is the process ID under which they are executing.