102 lines
3.7 KiB
Plaintext
102 lines
3.7 KiB
Plaintext
SHELL(1) User Commands SHELL(1)
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NAME
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shell - Spinix shell program
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SYNOPSIS
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shell
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DESCRIPTION
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Provides the command-line interface for the Spinix operating system.
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The shell program can execute the following commands:
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pwd - print the current working directory
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cd - change working directory
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echo - echo the command line parameters
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FILE - execute FILE
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Executable files can be one of the following:
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- Spinix Spin application
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- Spinix C application
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- Stand-alone C or Spin program
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- script file
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Spinix examines the first long of a file to determine what type of
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executable it is. A Spin app contains "SPIN" and a C app contains
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"CAPP". C apps must use the LMM memory model.
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A stand-alone C or Spin program is signalled by a clock frequency
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between 80 and 120 MHz. Spinix will modify the clock frequency to
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match the current clock frequency when the stand-along program is run.
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It does not modify any other portion of the program.
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C and Spin programs must be less than or equal to 31.5K bytes since the
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spinix shared memory is located in the top 512 bytes of memory.
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Program files must consist of contiguous sectors, since the loader does
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not implement cluster chaining. This can be ensured by using 32K
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clusters.
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Standard I/O can be redirected by using the ">", "<" and ">>" comand-
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line modifiers.
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The first line of a script file must start with "#shell". Script file
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can call another script file up to 26 levels deep.
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Shell script files support the following commands:
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if - conditionally execute based on following condition
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then - must be on the next line after an "if" line
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fi - terminates the body of an if statment
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while - begin conditional loop based on following condition
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do - must be on the next line after a "while" line
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done - terminats the body of a while statement
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exit - exit the script file
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An if statement may contain an executable file, such as
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if spinit file
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or
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if test $a -ne 0
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The if statement will test the return value from the executable file,
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which is referenced by $?. A short-hand version of using test is to
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use bracket, so that the "if test" statement above can be written as
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if [ $a -ne 0 ]
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The shell allows defining variables using the "=" operator, such as
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a=123
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There must be no spaces before or after the equal. Double quotes
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can be used to assign a value containing spaces, such as
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b="This is a test"
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Variables can be accessed by prepending a "$" character to the name.
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From the previous examples, a and b can be printed using echo by
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typing
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echo $a $b
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Spinix provides other variables, which are $?, $#, $1, $2, etc.
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$? contains the return value from the last program that has been
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executed. $# contains the number of command-line parameters, and
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$1, $2, etc. contain the values of the command-line parameters.
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LIMITATIONS
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AUTHOR
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Dave Hein
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COPYRIGHT
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Copyright (c) 2011, 2012, 2013, Dave Hein
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MIT License (See license.txt in the root directory)
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This is free software: you are free to change and redistribute it.
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There is no warranty, to the extent permitted by law.
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SPINIX utility March 2012 SHELL(1)
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