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Added intro paragraph about section, plus a paragraph 

about exit status values.  Move "user intro" text to NOTES.
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Michael Kerrisk 2007-10-23 14:48:10 +00:00
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man1/intro.1
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.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" 2007-10-23 mtk Added intro paragraph about section, plus a paragraph
.\" about exit status values.
.\"
.TH INTRO 1 2002-08-06 "Linux" "Linux User's Manual"
.SH NAME
intro \- Introduction to user commands
.SH DESCRIPTION
Section 1 of the manual describes user commands and tools,
for example, file manipulation tools, shells, compilers,
web browsers, file and image viewers and editors, and so on.
All commands yield a status value on termination.
This value can be tested (e.g., in most shells the variable
.I $?
contains the status of the last executed command)
to see whether the command completed successfully.
A zero exit status is conventionally used to indicate success,
and a non-zero status means that the command was unsuccessful.
(Details of the exit status can be found in
.BR wait (2).)
A non-zero exit status can be in the range 1 to 255, and some commands
use different non-zero status values to indicate the reason why the
command failed.
.SH NOTES
Linux is a flavor of Unix, and as a first approximation
all user commands under Unix work precisely the same under
Linux (and FreeBSD and lots of other Unix-like systems).