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Top Forums UNIX for Advanced & Expert Users variables don't work for inline "su" script Post 302114807 by joekreif on Wednesday 18th of April 2007 03:17:32 PM
Old 04-18-2007
Bug variables don't work for inline "su" script

My first post here...

I cannot get variables to work when using inline KSH commands on a "su" command. I have a KSH script, below, that produces my problem:

#!/usr/bin/ksh
su <user_id> <<-END
export FLD1=`echo $PWD`
pwd
echo $FLD1
echo TEST
echo $PWD
END

The script will prompt me for the user's password, and then will display the following:

Password:
/home/jkreife

TEST
/home/jkreife

Notice the "blank" line between my $HOME directory and "TEST". It should have displayed the contents of the FLD1 variable, but does not. My intention is to run a KSH script that loads an Oracle DB using an oracle admin signon, but cannot get variables to work. Can any Unix expert look at this and give me some much needed help? Smilie

Thanks!
Joe K.
 

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LKSH(1) 						    BSD General Commands Manual 						   LKSH(1)

NAME
lksh -- Legacy Korn shell built on mksh SYNOPSIS
lksh [-+abCefhiklmnprUuvXx] [-+o opt] [-c string | -s | file [args ...]] DESCRIPTION
lksh is a command interpreter intended exclusive for running legacy shell scripts. It is built on mksh; refer to its manual page for details on the scripting language. LEGACY MODE
lksh has the following differences from mksh: o lksh is not suitable for use as /bin/sh. o There is no explicit support for interactive use, nor any command line editing code. Hence, lksh is not suitable as a user's login shell, either; use mksh instead. o The KSH_VERSION string identifies lksh as ``LEGACY KSH'' instead of ``MIRBSD KSH''. o Some mksh specific extensions are missing; specifically, the -T command-line option. o lksh always uses traditional mode for constructs like: $ set -- $(getopt ab:c "$@") $ echo $? POSIX mandates this to show 0, but traditional mode passes through the errorlevel from the getopt(1) command. o lksh, unlike AT&T UNIX ksh, does not keep file descriptors > 2 private. o lksh parses leading-zero numbers as octal (base 8). o Integers use the host C environment's long type, not int32_t. Unsigned arithmetic is done using unsigned long, not uint32_t. Neither value limits nor wraparound is guaranteed. Dividing the largest negative number by -1 is Undefined Behaviour (but might work on 32-bit and 64-bit long types). o lksh only offers the traditional ten file descriptors to scripts. SEE ALSO
mksh(1) https://www.mirbsd.org/mksh.htm https://www.mirbsd.org/ksh-chan.htm CAVEATS
lksh tries to make a cross between a legacy bourne/posix compatibl-ish shell and a legacy pdksh-alike but ``legacy'' is not exactly speci- fied. Parsing numbers with leading zero digits or ``0x'' is relatively recent in all pdksh derivates, but supported here for completeness. It might make sense to make this a run-time option, but that might also be overkill. The set built-in command does not have all options one would expect from a full-blown mksh or pdksh. Talk to the MirOS development team using the mailing list at <miros-mksh@mirbsd.org> or the #!/bin/mksh (or #ksh) IRC channel at irc.freenode.net (Port 6697 SSL, 6667 unencrypted) if you need any further quirks or assistance, and consider migrating your legacy scripts to work with mksh instead of requiring lksh. MirBSD February 11, 2013 MirBSD
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