3.30 Processes

Procedures for executing the processes.

Function: run-process (command …) env dir

executes a process.
OS command and arguments to execute give by symbols or strings.
Symbols shown as follows have special meaning.

> filename	redirects standard output to the file
2> filename	redirects standard error output to the file
>> filename	redirects standard output to the file with append mode
2>> filename	redirects standard error output to the file with append mode
2>&1 filename	merges standard output and standard error output
cmd1 | cmd2	redirects output of cmd1 to input of cmd2(pipe)

Function: system cmd

executes the command using the shell.
In UNIX and Max OS X, sh/bash/tcsh will use for execute the command, IN Windows cmd.exe will use.

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