Unknown errors for hard and soft edge script

[Anonymous]

I found a script online that would change the edges of my model to hard and soft based on the angles of the normals. I've seen someone else use this and it works fine but on my computer, I get numerous errors. 

This is the script:
string $objList[] = ls -sl -o;
string $uvBorder[];
string $edgeUVs[];
string $finalBorder[];

for ($subObj in $objList) {
select -r $subObj;
polyNormalPerVertex -ufn true;
polySoftEdge -a 180 -ch 1 $subObj;
select -r $subObj.map["*"];

polySelectBorderShell 1;

$uvBorder = polyListComponentConversion -te -in;
$uvBorder = ls -fl $uvBorder;

clear( $finalBorder );

for( $curEdge in $uvBorder ) {
$edgeUVs = polyListComponentConversion -tuv $curEdge;
$edgeUVs = ls -fl $edgeUVs;

if( size( $edgeUVs ) > 2 ) {
$finalBorder[ size( $finalBorder ) ] = $curEdge;
}
}

polySoftEdge -a 0 -ch 1 $finalBorder;
}

select -r $objList;

And these are the errors:
// Error: string $objList[] = ls -sl -o;
//
// Error: Line 1.24: Invalid use of Maya object "ls". //
// Error: string $objList[] = ls -sl -o;
//
// Error: Line 1.28: Invalid use of Maya object "sl". //
// Error: string $objList[] = ls -sl -o;
//
// Error: Line 1.30: Invalid use of Maya object "o". //
// Error: $uvBorder = polyListComponentConversion -te -in;
//
// Error: Line 14.41: Invalid use of Maya object "polyListComponentConversion". //
// Error: $uvBorder = polyListComponentConversion -te -in;
//
// Error: Line 14.45: Invalid use of Maya object "te". //
// Error: $uvBorder = ls -fl $uvBorder;
//
// Error: Line 15.16: Invalid use of Maya object "ls". //
// Error: $uvBorder = ls -fl $uvBorder;
//
// Error: Line 15.28: Invalid use of Maya object "fl". //
// Error: $edgeUVs = polyListComponentConversion -tuv $curEdge;
//
// Error: Line 20.40: Invalid use of Maya object "polyListComponentConversion". //
// Error: $edgeUVs = polyListComponentConversion -tuv $curEdge;
//
// Error: Line 20.52: Invalid use of Maya object "tuv". //
// Error: $edgeUVs = ls -fl $edgeUVs;
//
// Error: Line 21.15: Invalid use of Maya object "ls". //
// Error: $edgeUVs = ls -fl $edgeUVs;
//
// Error: Line 21.26: Invalid use of Maya object "fl". //

I'm using a student edition of 2018 and have no idea what is wrong or how to fix it.