repeat num
      statement
      ...
end

Repeat execution of statement, ... for num times.

if condition then
   Astatement
      ...
else
   Bstatement
      ...
end

Evaluate Astatement ... if condition is true otherwise evaluate Bstatement ... Rather limited since Ysh does not process expressions.

while condition
      statement
      ...
end

Execute statement ... while condition is true. Rather limited since Ysh does not yet process expressions.