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From "Noah Slater (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-169) POSIX shell incompatibilities
Date Wed, 03 Dec 2008 16:15:44 GMT
POSIX shell incompatibilities 
------------------------------

                 Key: COUCHDB-169
                 URL: https://issues.apache.org/jira/browse/COUCHDB-169
             Project: CouchDB
          Issue Type: Bug
          Components: Infrastructure
         Environment: Solaris
            Reporter: Noah Slater
            Assignee: Noah Slater


> My local "checkbashisms" doesn't seem to complain at all. The [ ... ] syntax is just
a shortcut for "test" and I would prefer to avoid it if possible. Could you check for me that
using "test expr" wouldn't work in its place.                                       
                                                                                         
              
No, "test expr" doesn't work. After test you can only have arguments to test, not shell expressions.
It is possible of course to do:                                            
                                                                                         
              
if test `echo 2> /dev/null >> $PID_FILE; echo $?` -gt 0; then                   
                       
                                                                                         
              
For proof, see the man page: http://docs.sun.com/app/docs/doc/816-5165/test-1?l=en&q=man&a=view
        
                                                                                         
              
> This seems reasonable, though checkbashisms doesn't report anything.                
                 
>                                                                                     
                 
> I am wondering if your Solaris shell is POSIXly correct. Could you provide me with a
pointer to its manual, please?                                                           
     
                                                                                         
              
It doesn't get more POSIX than Solaris :).                                               
              
                                                                                         
              
$ /bin/sh                                                                                
              
$ echo $(echo yes)                                                                       
              
syntax error: `(' unexpected                                                             
              
                                                                                         
              
Here is the man page. Note that the "Command substitution" section doesn't mention anything
about $() syntax.                                                                      
                                                                                         
              
http://docs.sun.com/app/docs/doc/816-5165/sh-1?l=en&q=man&a=view

You may want to have a our collaborative notes over there:     
                                         
 - http://wiki.joyent.com/accelerators:setup-couchdb                                     
               
 - http://discuss.joyent.com/viewtopic.php?id=24108  

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