Programs are executed in a sequential order by default.
The basic syntax of the command is to jump to a specific line if a line specified is the "current line".
-1 is a special line: it matches with all of the lines.
To unconditionally jump to a line:
jcln -1, line #For example, to jump to line 5, you type: jcln -1, 5
To conditionally jump to a line:
jcln 1, 5 #If the current line number is 1, jump to line 5.