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Full Discussion: my case statement doesn't work..
Top Forums UNIX for Dummies Questions & Answers my case statement doesn't work.. Post 24321 by Perderabo on Wednesday 10th of July 2002 08:21:35 AM
Old 07-10-2002
majeed73 was kinda on the right track. When your login shell runs your shell script, it creates a child process. Inside that child process you are changing ORACLE_SID. Since it is exported, if that child process was to create any children of its own, those children would see the new ORACLE_SID. But a child cannot affect its parent. When the child process exits, the parent continues with the old value for ORACLE_SID. There is nothing that the child can do to change this. Ditto with your aliases by the way.

Since this stuff was in your .profile, your login shell must also be /bin/sh. The parent could invoke the script as a dotted script. Instead of:
"./script" or "script"
do this:
". ./script" or ". script"

That will cause the script to run in the current shell rather than a subshell. And you should be able to alias that:
alias script=". $HOME/realscript"
or whatever. So now the command "script" would do what you want.
 

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)
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