READDIR(3am) GNU Awk Extension Modules READDIR(3am)
NAME
readdir - directory input parser for gawk
SYNOPSIS
@load "readdir"
BEGIN { PROCINFO["readdir_override"] = any_value } # optional
DESCRIPTION
The readdir extension adds an input parser for directories.
When this extension is in use, instead of skipping directories named on
the command line (or with getline), they are read, with each entry
returned as a record.
The record consists of three fields separated by forward slash
characters. The first two are the inode number and the filename, and
the third field is a single letter indicating the type of the file: f
for file, d for directory, b for a block device, c for a character
device, p for a FIFO, l for a symbolic link, or s for a socket.
On systems where the directory entry contains the file type, the third
field is filled in from that information. On systems without the file
type information, the extension falls back to calling stat(2), in order
to provide the information. Thus the third field should never be u
(unknown).
Normally, when reading directories, you should set FS equal to "/".
However, you may instead chose to create PROCINFO["readdir_override"]
(with any value). If this element exists when the directory is opened,
then the extension automatically sets the fields in each record for
you.
By default, if a directory cannot be opened (due to permission
problems, for example), gawk will exit. As with regular files, this
situation can be handled using a BEGINFILE rule that checks ERRNO and
prints an error or otherwise handles the problem.
EXAMPLE
@load "readdir"
...
BEGIN { FS = "/" }
{ print "file name is", $2 }
SEE ALSO
GAWK: Effective AWK Programming, filefuncs(3), fnmatch(3),
fork(3), inplace(3), ordchr(3), readfile(3), revoutput(3),
rwarray(3), time(3).
readdir(3), stat(2).
AUTHOR
Arnold Robbins, arnold@skeeve.com.
COPYING PERMISSIONS
Copyright (C) 2012, 2013, 2018, 2019, 2023 Free Software Foundation,
Inc.
Permission is granted to make and distribute verbatim copies of this
manual page provided the copyright notice and this permission notice
are preserved on all copies.
Permission is granted to copy and distribute modified versions of this
manual page under the conditions for verbatim copying, provided that
the entire resulting derived work is distributed under the terms of a
permission notice identical to this one.
Permission is granted to copy and distribute translations of this
manual page into another language, under the above conditions for
modified versions, except that this permission notice may be stated in
a translation approved by the Foundation.
Free Software Foundation June 02 2023 READDIR(3am)
gawk 5.3.0 - Generated Thu Nov 2 10:00:37 CDT 2023