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Top Forums UNIX for Dummies Questions & Answers General Terminology related to the UNIX System Post 302363515 by vbe on Tuesday 20th of October 2009 01:32:29 PM
Old 10-20-2009
There is no idea behind a shell but a developper (Bourne, Korn etc...)
the true shell at the beginning was sh, but some people wanted more... so the differences are in functionalities...
But they all have in common what is known as environment and shell variables

---------- Post updated at 19:27 ---------- Previous update was at 19:24 ----------

Your environment is what you see when you type env
The variables that are set here follow the format:
VARIABLE-NAME=value

---------- Post updated at 19:32 ---------- Previous update was at 19:27 ----------

about export, look:
Code:
# check the is no variable TITI beeing used...
ant:/home/vbe $ echo $TITI

ant:/home/vbe $ TITI=toto
ant:/home/vbe $ echo $TITI
toto
ant:/home/vbe $ sh
ant:/home/vbe $ echo $TITI

ant:/home/vbe $ exit
ant:/home/vbe $ echo $TITI
toto
ant:/home/vbe $

 

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perl(1) 						      General Commands Manual							   perl(1)

NAME
perl - Practical Extraction and Report Language DESCRIPTION
The perl software is unsupported software that is provided as part of Tru64 UNIX. Compaq will fix problems in this unsupported software only if they are specific to Tru64 UNIX. Compaq will not fix problems that are integral to the software itself or that occur when the com- ponent is used on UNIX systems other than Tru64 UNIX. Compaq will not add functionality to this software. Except for this reference page, other reference pages that Tru64 UNIX supplies for perl are passed through without changes. The reference pages distributed as part of this software are available in the directories /usr/share/doclib/annex/man/man[1-9]. You should use this directory stem in the man command or add it to the MANPATH environment variable to make these files available to the man command. Note Compaq is not responsible for the content or quality of reference pages and other documents installed under the /usr/share/doclib/annex directory and does not revise this material in response to customer problem reports. Reference pages installed under the /usr/share/doclib/annex/man directory are not available from Compaq in book form; for example, they are not included in the reference manu- als that you receive when you order the Tru64 UNIX documentation set as hard copy books. Problems related to the content or quality of any documentation installed in the /usr/share/doclib/annex directory tree should be sent to the developers of the documentation. The format for changing the search path with the man command is: man -P /usr/share/doclib/annex/man [section] title... If you are using the Bourne, Korn, or POSIX shells, use the following command sequence to modify your environment: MANPATH=$MAN- PATH:/usr/share/doclib/annex/man export MANPATH If you are using the C shell, enter the command: setenv MANPATH `echo $MANPATH`:/usr/share/doclib/annex/man See the reference pages for the man(1) command for additional information on the search path used to locate files. The reference pages associated with this product are not included in the whatis data base created by the catman command. Therefore, the man -k and apropos commands will not locate reference pages included with this product. SEE ALSO
Commands: apropos(1), catman(8), man(1) perl(1)
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