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Top Forums UNIX for Dummies Questions & Answers Check for difference in output of 2 commands? Post 302489826 by turbofayce on Friday 21st of January 2011 07:12:53 PM
Old 01-21-2011
Mac 10.6.6

(This is just hobby/personal use. I'm on a mac (10.6.6). I have been strictly Windows since 3.1 and I'm trying to get more familiar with what my mac is able to do. I know i'm able to open the terminal app and interface using unix commands, but I don't really know unix at all. I know there's tons of apps for macs to do simple things but are just wasting space and processing so I figured, I might as well learn the OS because that should cover about 90% of those apps. I don't prefer wasting system resources either, so I want to get optimal use out of my system. I really dig apps that use the system properly, and cleverly, rather than rewriting functions to do what's already available thru calling system commands.)

methyl: thanks for the reply. I was playing around with shell scripting trying to figure it out. I was under the impression that I could call unix commands like I would call functions in a oop language, then pipe commands together to get like a variable out of the output, then feed that into some other unix command. Am I looking at this the wrong way?

i.e. in the shell:

command (feed result to) search_for_result_from_previous_command (feed result to) echo_to_standard_output

You can do this sort of thing with unix, right? Because I can imagine endless possibilities with a system like this.
 

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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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