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Operating Systems Linux Difference between Linux and Unix and also C and C++ and also about Shell Scripting Post 302078902 by grumpf on Wednesday 5th of July 2006 09:44:46 AM
Old 07-05-2006
C is command language, around since 1970, very powerfull very easy to move the other
processors , highly influencal to other languages.

C++ is the object orientated version on C, the diffference is basic that the C manual is a few pages, while C++ manul is a few thousand pages.


shell scripting:
totaly diffent stuff, you can use any command installed on you computer; since it is an interpreter 'Language' error may appear later, very powerfull most time used as 'glue' between programms.
Most shell support stuff like loops and controllstructures.
perl is called 'shell on steroids'
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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