parcat(1)

1PARCAT(1)                          parallel                          PARCAT(1)
2
3
4

NAME

6       parcat - cat files or fifos in parallel
7

SYNOPSIS

9       parcat [--rm] [-#] file(s) [-#] file(s)
10

DESCRIPTION

12       GNU parcat reads files or fifos in parallel. It writes full lines so
13       there will be no problem with mixed-half-lines which you risk if you
14       use:
15
16          (cat file1 & cat file2 &) | ...
17
18       Arguments can be given on the command line or passed in on stdin
19       (standard input).
20

OPTIONS

22       -#       Arguments following this will be sent to the file descriptor
23                #. E.g.
24
25                  parcat -1 stdout1 stdout2 -2 stderr1 stderr2
26
27                will send stdout1 and stdout2 to stdout (standard output =
28                file descriptor 1), and send stderr1 and stderr2 to stderr
29                (standard error = file descriptor 2).
30
31       --rm     Remove files after opening. As soon as the files are opened,
32                unlink the files.
33

EXAMPLES

35   Simple line buffered output
36       GNU parallel saves output to tempfiles. If the amount of data is bigger
37       than the free disk space, then you can use this technique to do line
38       buffering without saving to disk:
39
40         mkfifo slot-{1..5}
41         seq 10000000 | parallel -j5 --round --pipe 'cat > slot-{%}' &
42         parcat slot-{1..5} | wc
43

REPORTING BUGS

45       GNU parcat is part of GNU parallel. Report bugs to
46       <bug-parallel@gnu.org>.
47

AUTHOR

49       Copyright (C) 2016-2019 Ole Tange, http://ole.tange.dk and Free
50       Software Foundation, Inc.
51

LICENSE

53       This program is free software; you can redistribute it and/or modify it
54       under the terms of the GNU General Public License as published by the
55       Free Software Foundation; either version 3 of the License, or at your
56       option any later version.
57
58       This program is distributed in the hope that it will be useful, but
59       WITHOUT ANY WARRANTY; without even the implied warranty of
60       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
61       General Public License for more details.
62
63       You should have received a copy of the GNU General Public License along
64       with this program.  If not, see <http://www.gnu.org/licenses/>.
65
66   Documentation license I
67       Permission is granted to copy, distribute and/or modify this
68       documentation under the terms of the GNU Free Documentation License,
69       Version 1.3 or any later version published by the Free Software
70       Foundation; with no Invariant Sections, with no Front-Cover Texts, and
71       with no Back-Cover Texts.  A copy of the license is included in the
72       file fdl.txt.
73
74   Documentation license II
75       You are free:
76
77       to Share to copy, distribute and transmit the work
78
79       to Remix to adapt the work
80
81       Under the following conditions:
82
83       Attribution
84                You must attribute the work in the manner specified by the
85                author or licensor (but not in any way that suggests that they
86                endorse you or your use of the work).
87
88       Share Alike
89                If you alter, transform, or build upon this work, you may
90                distribute the resulting work only under the same, similar or
91                a compatible license.
92
93       With the understanding that:
94
95       Waiver   Any of the above conditions can be waived if you get
96                permission from the copyright holder.
97
98       Public Domain
99                Where the work or any of its elements is in the public domain
100                under applicable law, that status is in no way affected by the
101                license.
102
103       Other Rights
104                In no way are any of the following rights affected by the
105                license:
106
107                ·        Your fair dealing or fair use rights, or other
108                         applicable copyright exceptions and limitations;
109
110                ·        The author's moral rights;
111
112                ·        Rights other persons may have either in the work
113                         itself or in how the work is used, such as publicity
114                         or privacy rights.
115
116       Notice   For any reuse or distribution, you must make clear to others
117                the license terms of this work.
118
119       A copy of the full license is included in the file as cc-by-sa.txt.
120

DEPENDENCIES

122       GNU parcat uses Perl.
123