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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <120229110632.ZM28317@torch.brasslantern.com>
Date: Wed, 29 Feb 2012 11:06:32 -0800
In-reply-to:
 <CADs2-=Qb4o9gh_40ASr8HNGfpSz8XLEcy0pqQLnJC+eE6ZvRSg@mail.gmail.com>
Comments: In reply to Dipak Gaigole <dipakgaigole@gmail.com>
 "Re: zsh behavior when fork() failed" (Feb 29,  6:27pm)
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To: Dipak Gaigole <dipakgaigole@gmail.com>
Subject: Re: zsh behavior when fork() failed
Cc: zsh-workers@zsh.org
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On Feb 29,  6:27pm, Dipak Gaigole wrote:
}
} I have applied this patch but unfortunately the script still continues
} even after the fork failures while executing commands from the script.
} 
} bash-2.05b$ cat /tmp/test1.sh
} #!/bin/sh
} x="My default value"
} x=`date`
} echo $?
} echo "Current Date is:" "$x"
} date
} echo $?
} bash-2.05b$ zsh /tmp/test1.sh
} /tmp/test1.sh:3: fork failed: resource temporarily unavailable
} 1
} Current Date is: My default value
} /tmp/test1.sh:6: fork failed: resource temporarily unavailable
} 1
} bash-2.05b$
} 
} Can you please check this on your end?

I get (schaefer[N] is my top-level prompt):

schaefer[691] Src/zsh -f /tmp/test1.sh
/tmp/test1.sh:3: fork failed: resource temporarily unavailable
1
Current Date is: My default value
/tmp/test1.sh:6: fork failed: resource temporarily unavailable
schaefer[692] echo $?
1

There's no exit after `date` because that was in a subshell, but I do
see the exit after the command in the parent shell.

Are you sure a path-searched "zsh" is finding the right binary?