Originální popis anglicky:
asa - interpret carriage-control characters
Návod, kniha: POSIX Programmer's Manual
asa [ file ... ]
The
asa utility shall write its input files to standard output, mapping
carriage-control characters from the text files to line-printer control
sequences in an implementation-defined manner.
The first character of every line shall be removed from the input, and the
following actions are performed.
If the character removed is:
- <space>
- The rest of the line is output without change.
- 0
- A <newline> is output, then the rest of the input
line.
- 1
- One or more implementation-defined characters that causes
an advance to the next page shall be output, followed by the rest of the
input line.
- +
- The <newline> of the previous line shall be replaced
with one or more implementation-defined characters that causes printing to
return to column position 1, followed by the rest of the input line. If
the '+' is the first character in the input, it shall be equivalent
to <space>.
The action of the
asa utility is unspecified upon encountering any
character other than those listed above as the first character in a line.
None.
- file
- A pathname of a text file used for input. If no file
operands are specified, the standard input shall be used.
The standard input shall be used only if no
file operands are specified;
see the INPUT FILES section.
The input files shall be text files.
The following environment variables shall affect the execution of
asa:
- LANG
- Provide a default value for the internationalization
variables that are unset or null. (See the Base Definitions volume of
IEEE Std 1003.1-2001, Section 8.2, Internationalization
Variables for the precedence of internationalization variables used to
determine the values of locale categories.)
- LC_ALL
- If set to a non-empty string value, override the values of
all the other internationalization variables.
- LC_CTYPE
- Determine the locale for the interpretation of sequences of
bytes of text data as characters (for example, single-byte as opposed to
multi-byte characters in arguments and input files).
- LC_MESSAGES
- Determine the locale that should be used to affect the
format and contents of diagnostic messages written to standard error.
- NLSPATH
- Determine the location of message catalogs for the
processing of LC_MESSAGES .
Default.
The standard output shall be the text from the input file modified as described
in the DESCRIPTION section.
None.
None.
None.
The following exit values shall be returned:
- 0
- All input files were output successfully.
- >0
- An error occurred.
Default.
The following sections are informative.
None.
- 1.
- The following command:
permits the viewing of
file (created by a program using FORTRAN-style
carriage-control characters) on a terminal.
- 2.
- The following command:
formats the FORTRAN output of
a.out and directs it to the printer.
The
asa utility is needed to map "standard" FORTRAN 77 output
into a form acceptable to contemporary printers. Usually,
asa is used
to pipe data to the
lp utility; see
lp.
This utility is generally used only by FORTRAN programs. The standard developers
decided to retain
asa to avoid breaking the historical large base of
FORTRAN applications that put carriage-control characters in their output
files. There is no requirement that a system have a FORTRAN compiler in order
to run applications that need
asa.
Historical implementations have used an ASCII <form-feed> in response to a
1 and an ASCII <carriage-return> in response to a
'+' . It is
suggested that implementations treat characters other than 0, 1, and
'+' as <space> in the absence of any compelling reason to do
otherwise. However, the action is listed here as "unspecified",
permitting an implementation to provide extensions to access fast
multiple-line slewing and channel seeking in a non-portable manner.
None.
fort77 ,
lp
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 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
.
