parenthesis inside $(...)

parenthesis inside $(...)

[Stephane Chazelas]

Hi,

Would that:

http://groups.google.com/group/comp.unix.shell/msg/18e47b386da472bd

be an already known issue.

Essentially:

$ zsh << \E
heredoc> echo $(
heredoc>    case x in  x) echo x;; esac
heredoc> )
heredoc>
heredoc> echo $(
heredoc>    echo comment # with )
heredoc> )
heredoc>
heredoc> echo $(
heredoc> cat <<\eof
heredoc>       here-doc with )
heredoc> eof
heredoc> )
heredoc>
heredoc> echo $(
heredoc> cat <<\eof
heredoc>    '   # or a single back- or doublequote
heredoc> eof
heredoc> )
heredoc> E
zsh: parse error near `;;'
zsh: parse error near `)'
comment
zsh: parse error near `)'
here-doc with
zsh: command not found: eof
zsh: parse error near `)'
zsh: parse error near `$('

Best regards,
Stéphane

Re: parenthesis inside $(...)

[Peter Stephenson]

Stephane Chazelas wrote:
> $ zsh << \E
> heredoc> echo $(
> heredoc>    case x in  x) echo x;; esac
> heredoc> )
> heredoc> E
> zsh: parse error near `;;'
> zsh: parse error near `)'

Yes, it's known about (it's hinted at in the tip on page 314 of From
Bash to Z Shell: Conquering the Command Line, by Oliver Kiddle, Jerry
Peek and Peter Stephenson, Apress, ISBN 1 59059 376 6, in case anyone
hasn't got around to buying that yet) and the general feeling when this
came up here before was that it was pretty much inevitable.

The right way of constructing a nested case is with balanced
parentheses:

echo $(
   case x in (x) echo x;; esac
)

-- 
Peter Stephenson <p.w.stephenson@ntlworld.com>
Web page still at http://www.pwstephenson.fsnet.co.uk/