Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 179 insertions, 0 deletions

diff --git a/upstream/archlinux/man1p/unset.1p b/upstream/archlinux/man1p/unset.1p
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+'\" et
+.TH UNSET "1P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+unset
+\(em unset values and attributes of variables and functions
+.SH SYNOPSIS
+.LP
+.nf
+unset \fB[\fR-fv\fB] \fIname\fR...
+.fi
+.SH DESCRIPTION
+Each variable or function specified by
+.IR name
+shall be unset.
+.P
+If
+.BR \-v
+is specified,
+.IR name
+refers to a variable name and the shell shall unset it and remove it
+from the environment. Read-only variables cannot be unset.
+.P
+If
+.BR \-f
+is specified,
+.IR name
+refers to a function and the shell shall unset the function definition.
+.P
+If neither
+.BR \-f
+nor
+.BR \-v
+is specified,
+.IR name
+refers to a variable; if a variable by that name does not exist, it is
+unspecified whether a function by that name, if any, shall be unset.
+.P
+Unsetting a variable or function that was not previously set shall not
+be considered an error and does not cause the shell to abort.
+.P
+The
+.IR unset
+special built-in shall support the Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 12.2" ", " "Utility Syntax Guidelines".
+.P
+Note that:
+.sp
+.RS 4
+.nf
+
+VARIABLE=
+.fi
+.P
+.RE
+.P
+is not equivalent to an
+.IR unset
+of
+.BR VARIABLE ;
+in the example,
+.BR VARIABLE
+is set to
+.BR \(dq\^\(dq .
+Also, the variables that can be
+.IR unset
+should not be misinterpreted to include the special parameters (see
+.IR "Section 2.5.2" ", " "Special Parameters").
+.SH OPTIONS
+See the DESCRIPTION.
+.SH OPERANDS
+See the DESCRIPTION.
+.SH STDIN
+Not used.
+.SH "INPUT FILES"
+None.
+.SH "ENVIRONMENT VARIABLES"
+None.
+.SH "ASYNCHRONOUS EVENTS"
+Default.
+.SH STDOUT
+Not used.
+.SH STDERR
+The standard error shall be used only for diagnostic messages.
+.SH "OUTPUT FILES"
+None.
+.SH "EXTENDED DESCRIPTION"
+None.
+.SH "EXIT STATUS"
+.IP "\00" 6
+All
+.IR name
+operands were successfully unset.
+.IP >0 6
+At least one
+.IR name
+could not be unset.
+.SH "CONSEQUENCES OF ERRORS"
+Default.
+.LP
+.IR "The following sections are informative."
+.SH "APPLICATION USAGE"
+None.
+.SH EXAMPLES
+Unset
+.IR VISUAL
+variable:
+.sp
+.RS 4
+.nf
+
+unset -v VISUAL
+.fi
+.P
+.RE
+.P
+Unset the functions
+.BR foo
+and
+.BR bar :
+.sp
+.RS 4
+.nf
+
+unset -f foo bar
+.fi
+.P
+.RE
+.SH "RATIONALE"
+Consideration was given to omitting the
+.BR \-f
+option in favor of an
+.IR unfunction
+utility, but the standard developers decided to retain historical
+practice.
+.P
+The
+.BR \-v
+option was introduced because System V historically used one name space
+for both variables and functions. When
+.IR unset
+is used without options, System V historically unset either a function
+or a variable, and there was no confusion about which one was intended.
+A portable POSIX application can use
+.IR unset
+without an option to unset a variable, but not a function; the
+.BR \-f
+option must be used.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "Section 2.14" ", " "Special Built-In Utilities"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 12.2" ", " "Utility Syntax Guidelines"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .