1PARCAT(1) parallel PARCAT(1)
2
6 parcat - cat files or fifos in parallel
7
9 parcat [--rm] [-#] file(s) [-#] file(s)
10
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 (cat file1 & cat file2 &) | ...
17 Arguments can be given on the command line or passed in on stdin
19 (standard input).
20
22 -# Arguments following this will be sent to the file descriptor
23 #. E.g.
24 parcat -1 stdout1 stdout2 -2 stderr1 stderr2
26 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 --rm Remove files after opening. As soon as the files are opened,
32 unlink the files.
33
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 mkfifo slot-{1..5}
41 seq 10000000 | parallel -j5 --round --pipe 'cat > slot-{%}' &
42 parcat slot-{1..5} | wc
43
45 GNU parcat is part of GNU parallel. Report bugs to
46 <bug-parallel@gnu.org>.
47
49 Copyright (C) 2016,2017,2018 Ole Tange, http://ole.tange.dk and Free
50 Software Foundation, Inc.
51
53 Copyright (C) 2007,2008,2009,2010,2011 Free Software Foundation, Inc.
54 This program is free software; you can redistribute it and/or modify it
56 under the terms of the GNU General Public License as published by the
57 Free Software Foundation; either version 3 of the License, or at your
58 option any later version.
59 This program is distributed in the hope that it will be useful, but
61 WITHOUT ANY WARRANTY; without even the implied warranty of
62 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
63 General Public License for more details.
64 You should have received a copy of the GNU General Public License along
66 with this program. If not, see <http://www.gnu.org/licenses/>.
67 Documentation license I
69 Permission is granted to copy, distribute and/or modify this
70 documentation under the terms of the GNU Free Documentation License,
71 Version 1.3 or any later version published by the Free Software
72 Foundation; with no Invariant Sections, with no Front-Cover Texts, and
73 with no Back-Cover Texts. A copy of the license is included in the
74 file fdl.txt.
75 Documentation license II
77 You are free:
78 to Share to copy, distribute and transmit the work
80 to Remix to adapt the work
82 Under the following conditions:
84 Attribution
86 You must attribute the work in the manner specified by the
87 author or licensor (but not in any way that suggests that they
88 endorse you or your use of the work).
89 Share Alike
91 If you alter, transform, or build upon this work, you may
92 distribute the resulting work only under the same, similar or
93 a compatible license.
94 With the understanding that:
96 Waiver Any of the above conditions can be waived if you get
98 permission from the copyright holder.
99 Public Domain
101 Where the work or any of its elements is in the public domain
102 under applicable law, that status is in no way affected by the
103 license.
104 Other Rights
106 In no way are any of the following rights affected by the
107 license:
108 · Your fair dealing or fair use rights, or other
110 applicable copyright exceptions and limitations;
111 · The author's moral rights;
113 · Rights other persons may have either in the work
115 itself or in how the work is used, such as publicity
116 or privacy rights.
117 Notice For any reuse or distribution, you must make clear to others
119 the license terms of this work.
120 A copy of the full license is included in the file as cc-by-sa.txt.
122
124 GNU parcat uses Perl.
125
127 cat(1), parallel(1)
12820180122 2018-02-05 PARCAT(1)