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Full Discussion: Trying to figure out how the environment variables are being set
Top Forums UNIX for Beginners Questions & Answers Trying to figure out how the environment variables are being set Post 302998519 by Don Cragun on Friday 2nd of June 2017 04:28:33 PM
Old 06-02-2017
You use the dot command:
Code:
. filename

to have the current shell execute the commands in filename in your current shell execution environment. This works as long as filename is readable by you. Since the commands in filename were executed in the current shell execution environment, any variables set while it was running will be available for you to use in subsequent commands.

You use the command:
Code:
filename

(without the .) to run the commands in filename in a separate shell execution environment . When the commands in filename are done, that separate shell execution environment is deleted and anything that commands in filename did that did not change other files or were not written somewhere disappear. This doesn't work unless you have permission to execute filename and filename is on your search path for commands (as specified by the PATH environment variable).

But, it is also possible for a shell script to set up an environment and invoke an interactive database session. That script will not end until the interactive session is terminated by logging out of the database session.

All of the above are possible whether or not filename's first character is a <period>. The best way to figure out what a script might do is usually to read the file and look at the manual pages for your system to figure out what the commands in that file are doing.
 

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LEARN ABOUT OPENSOLARIS

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 5.11							    30 Jan 2004 							 script(1)
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