Re: Should nested case statements within command substitutions work on in bash 3.2.x?

[Jon Seymour]

Thanks for reply and the workaround.

jon.

On Sun, Mar 22, 2015 at 4:49 PM, Chris F.A. Johnson
ch...@cfajohnson.com wrote:
 On Sun, 22 Mar 2015, Jon Seymour wrote:

 I was surprised that this didn't work with the OSX version of bash 3.2:

 /bin/bash -c 'echo $(case yes in yes) echo yes; ;; no) echo no; ;;
 esac)'

 /bin/bash: -c: line 0: syntax error near unexpected token `;;'
 /bin/bash: -c: line 0: `echo $(case yes in yes) echo yes; ;; no)
 echo no; ;; esac)'

 It does work with bash 4.x.

 Is this a known issue with 3.2 or is it particular to the OSX
 implementation (which in my case is 3.2.53(1))?


   Balance the parentheses:


 echo $(case yes in (yes) echo yes; ;; (no) echo no; ;; esac)

 --
 Chris F.A. Johnson, http://cfajohnson.com

Re: Should nested case statements within command substitutions work on in bash 3.2.x?

[Chris F.A. Johnson]

On Sun, 22 Mar 2015, Jon Seymour wrote:


I was surprised that this didn't work with the OSX version of bash 3.2:

/bin/bash -c 'echo $(case yes in yes) echo yes; ;; no) echo no; ;; esac)'

/bin/bash: -c: line 0: syntax error near unexpected token `;;'
/bin/bash: -c: line 0: `echo $(case yes in yes) echo yes; ;; no)
echo no; ;; esac)'

It does work with bash 4.x.

Is this a known issue with 3.2 or is it particular to the OSX
implementation (which in my case is 3.2.53(1))?


  Balance the parentheses:

echo $(case yes in (yes) echo yes; ;; (no) echo no; ;; esac)

--
Chris F.A. Johnson, http://cfajohnson.com

Should nested case statements within command substitutions work on in bash 3.2.x?

[Jon Seymour]

I was surprised that this didn't work with the OSX version of bash 3.2:

 /bin/bash -c 'echo $(case yes in yes) echo yes; ;; no) echo no; ;; esac)'

/bin/bash: -c: line 0: syntax error near unexpected token `;;'
/bin/bash: -c: line 0: `echo $(case yes in yes) echo yes; ;; no)
echo no; ;; esac)'

It does work with bash 4.x.

Is this a known issue with 3.2 or is it particular to the OSX
implementation (which in my case is 3.2.53(1))?

jon.

Re: Should nested case statements within command substitutions work on in bash 3.2.x?

[Bob Proulx]

Jon Seymour wrote:
 I was surprised that this didn't work with the OSX version of bash 3.2:
 
  /bin/bash -c 'echo $(case yes in yes) echo yes; ;; no) echo no; ;; 
 esac)'
 
 /bin/bash: -c: line 0: syntax error near unexpected token `;;'
 /bin/bash: -c: line 0: `echo $(case yes in yes) echo yes; ;; no)
 echo no; ;; esac)'

 It does work with bash 4.x.

It was improved later.  But I see that zsh as of 5.0.7 still has the
same problem with that construct.

 Is this a known issue with 3.2 or is it particular to the OSX
 implementation (which in my case is 3.2.53(1))?

It is that way in 3.2 and not specific to your OS X implementation.

Of course you know that if you match the parens then it will parse
correctly.  Matching parens has been the standard way to handle this
case for all of the shells.

  $ bash -c 'echo $(case yes in (yes) echo yes ;; (no) echo no ;; esac)'
  yes

Bob