04-02-2013
A shell program is simply a collection of commands. And when the commands are put together, the desired result is achieved.
The #1 tells you the variable TEXT and the command to be used tr.
What have you tried, what examples of work can you share?
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=========================
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LEARN ABOUT FREEBSD
introduction
INTRO(1) BSD General Commands Manual INTRO(1)
NAME
intro -- introduction to general commands (tools and utilities)
DESCRIPTION
Section one of the manual contains most of the commands which comprise the BSD user environment. Some of the commands included in section
one are text editors, command shell interpreters, searching and sorting tools, file manipulation commands, system status commands, remote
file copy commands, mail commands, compilers and compiler tools, formatted output tools, and line printer commands.
All commands set a status value upon exit which may be tested to see if the command completed normally. Traditionally, the value 0 signifies
successful completion of the command, while a value >0 indicates an error. Some commands attempt to describe the nature of the failure by
using exit codes as defined in sysexits(3), while others simply set the status to an arbitrary value >0 (typically 1).
SEE ALSO
apropos(1), man(1), intro(2), intro(3), sysexits(3), intro(4), intro(5), intro(6), intro(7), security(7), intro(8), intro(9)
Tutorials in the UNIX User's Manual Supplementary Documents.
HISTORY
The intro manual page appeared in Version 6 AT&T UNIX.
BSD
October 21, 2001 BSD