OPTIND

OPTIND

[Chris F.A. Johnson]

   According to both the dash man page and the POSIX spec, "When the
   shell is invoked, OPTIND is initialized to 1."

   However, it actually takes the value of the environment variable
   if it exists:

$ OPTIND=4 dash -c 'echo "$OPTIND"'
4
$ OPTIND=4 bash -c 'echo "$OPTIND"'
1
$ OPTIND=4 ksh -c 'echo "$OPTIND"'
1
$ OPTIND=4 ksh93 -c 'echo "$OPTIND"'
1

-- 
    Chris F.A. Johnson, <http://cfajohnson.com/>
    Author:
    Pro Bash Programming: Scripting the GNU/Linux Shell (2009, Apress)
    Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)

Re: OPTIND

[Herbert Xu]

commit a14c418aee9d4ccd7cf888024e318b300173099f
Author: Herbert Xu <herbert@gondor.apana.org.au>
Date:   Fri Aug 23 21:27:42 2013 +1000

    [VAR] Initialise OPTIND after importing environment
    
    On Sat, Mar 23, 2013 at 01:46:20AM +0000, Chris F.A. Johnson wrote:
    >
    >   According to both the dash man page and the POSIX spec, "When the
    >   shell is invoked, OPTIND is initialized to 1."
    >
    >   However, it actually takes the value of the environment variable
    >   if it exists:
    >
    > $ OPTIND=4 dash -c 'echo "$OPTIND"'
    > 4
    > $ OPTIND=4 bash -c 'echo "$OPTIND"'
    > 1
    > $ OPTIND=4 ksh -c 'echo "$OPTIND"'
    > 1
    > $ OPTIND=4 ksh93 -c 'echo "$OPTIND"'
    > 1
    
    This patch fixes this by initialising OPTIND after importing the
    environment.
    
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/ChangeLog b/ChangeLog
index 9500c87..4276676 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,7 @@
 2013-08-23  Herbert Xu <herbert@gondor.apana.org.au>
 
 	* Propagate EXP_QPAT in subevalvar.
+	* Initialise OPTIND after importing environment.
 
 2013-03-12  Peter Rosin <peda@lysator.liu.se>
 
diff --git a/src/var.c b/src/var.c
index c35e925..fa24854 100644
--- a/src/var.c
+++ b/src/var.c
@@ -142,6 +142,8 @@ INIT {
 		}
 	}
 
+	setvarint("OPTIND", 1, 0);
+
 	fmtstr(ppid + 5, sizeof(ppid) - 5, "%ld", (long) getppid());
 	setvareq(ppid, VTEXTFIXED);

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt