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Shell script ignores $PATH?!

I have written a shell script to drive a Cygwin upgrade or install.

It checks that it's not being run from a locally-installed Cygwin.

Unfortunately, despite setting PATH to use only a network-installed
Cygwin (and not include /bin, /usr/bin etc.), the shell script still
somehow decides to invoke /usr/bin/sh.

Any idea why/how this happens?  I removed the "#!/bin/sh" from the
start of the script, and ran hash -r, thinking that may have been the
cause.  But echo $$ still reveals that it's really using my
local-installed Cygwin, not the network one mounted on L:.  You'll see
that the interactive shell is PID 3540, but since the /usr/bin/sh
script's parent PID is 3540, somehow it started a shell that wasn't in
$PATH, instead of one that was!

    Microsoft Windows XP [Version 5.1.2600]
    (C) Copyright 1985-2001 Microsoft Corp.

    D:\home\luke>set PATH=C:\WINDOWS\system32;C:\WINDOWS;l:\bin\cygwin\bin

    C:\cygwin\usr\X11R6\lib\X11\fonts on /usr/X11R6/lib/X11/fonts type system (binmode)
    C:\cygwin\bin on /usr/bin type system (textmode)
    C:\cygwin\lib on /usr/lib type system (textmode)
    C:\cygwin on / type system (textmode)
    d:\home on /home type system (textmode)
    c: on /cygdrive/c type user (textmode,noumount)
    d: on /cygdrive/d type user (textmode,noumount)
    l: on /cygdrive/l type user (textmode,noumount)
    p: on /cygdrive/p type user (textmode,noumount)
    u: on /cygdrive/u type user (textmode,noumount)
    w: on /cygdrive/w type user (textmode,noumount)
    x: on /cygdrive/x type user (textmode,noumount)
    y: on /cygdrive/y type user (textmode,noumount)
    z: on /cygdrive/z type user (textmode,noumount)

    bash-2.05b$ echo $PATH

    bash-2.05b$ echo $$

    bash-2.05b$ /cygdrive/x/cygnus/cisra/ latest
    The Cygwin mirror looks good

    PID is 3344, ps | grep ^[I ] *3344 gives:
	 3344    3540    3344       3152  con 11021 13:39:59 /usr/bin/sh

	 3752       1    3752       3752  con 11021   Sep 24 /usr/bin/rxvt
	 3768    3752    3768       3780    1 11021   Sep 24 /usr/bin/bash
	 2396       1    2396       2396  con 11021   Sep 24 /usr/bin/rxvt
    I    2428    2396    2428       2416    0 11021   Sep 24 /usr/bin/bash
    I    1996       1    1996       1996  con 11021   Oct  1 /cygdrive/l/bin/cygwin/bin/bash
	 1100    3768    1100       2164    1 11021 12:42:24 /usr/bin/vim
	 3540       1    3540       3540  con 11021 13:34:18 /cygdrive/l/bin/cygwin/bin/bash
	 3344    3540    3344       3152  con 11021 13:39:59 /usr/bin/sh
	 3852    3344    3344       2736  con 11021 13:40:00 /cygdrive/l/bin/cygwin/bin/ps
    SHELL is , PATH is /cygdrive/c/WINDOWS/system32:/cygdrive/c/WINDOWS:/cygdrive/l/bin/cygwin/bin

How do I stop the script from running commands that aren't in $PATH?


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