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Re: shell_execve tries to execute files for other interpreters


From: Chet Ramey
Subject: Re: shell_execve tries to execute files for other interpreters
Date: Thu, 25 Apr 2002 13:49:30 -0400

> I tried to write a script to be interpreted by another script.  Each
> script started with a #! line.  It turns out that this recursive
> script execution is not supported on Solaris 2.7 (execve returns
> ENOEXEC), so my attempt failed.
> 
> However, the process of diagnosing the problem was slowed by Bash
> 2.05a's misguided attempt to be helpful.  If simply exec'ing the file
> fails, Bash examines the beginning of the file to see if it is
> binary.  If it is not, it then interprets the file as a Bash script.

This behavior is mandated by POSIX.1-2001 (and POSIX.2-1992).  See

http://www.opengroup.org/onlinepubs/007904975/utilities/xcu_chap02.html#tag_02_09_01

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

Chet Ramey, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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