do en condition, aller a la fin
verifier les delimiters
impleter erreur syntax : EOF, unexpected do, unexpected done, pareil if

pipe_sequence

';;' sep
'; ;' sep-newline_list-sep
'		; ' newline-sep
'ls | cat ; ls | cat' line break and_or separator and_or

';;' sep-sep
';&' sep-sep
'&&' and_or "no_command"
'||' and_or "no_command"


while compound_list do compound_list done
	linebreak term  
