diff options
| author | Pádraig Brady <P@draigBrady.com> | 2015-11-20 11:54:00 +0000 |
|---|---|---|
| committer | Pádraig Brady <P@draigBrady.com> | 2015-11-21 16:45:18 +0000 |
| commit | c7f049c503527c3dd64b2850e2e768bbcf26f2a8 (patch) | |
| tree | d04b7def991ad5993eb2d2795e1ec07912e73bfe | |
| parent | 56d3269207db13b0f3a594d6d2cbc52913929d21 (diff) | |
| download | coreutils-c7f049c503527c3dd64b2850e2e768bbcf26f2a8.tar.xz | |
doc: give a tee example for combining process substitution outputs
This can be useful if you want to further process data
from process substitutions. For example:
datagen | tee >(md5sum --tag) > >(sha256sum --tag) | sort
* doc/coreutils.texi (tee invocation): Mention that -p is
useful with pipes that may not consume all data.
Add an example, similar to the one above.
* THANKS.in: Add Jirka Hladky.
| -rw-r--r-- | THANKS.in | 1 | ||||
| -rw-r--r-- | doc/coreutils.texi | 16 |
2 files changed, 17 insertions, 0 deletions
@@ -299,6 +299,7 @@ Jesse Thilo jgt2@eecs.lehigh.edu Jie Xu xuj@iag.net Jim Blandy jimb@cyclic.com Jim Dennis jimd@starshine.org +Jirka Hladky jhladky@redhat.com Joakim Rosqvist dvljrt@cs.umu.se Jochen Hein jochen@jochen.org Joe Orton joe@manyfish.co.uk diff --git a/doc/coreutils.texi b/doc/coreutils.texi index 8034807a4..0e28f4971 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -13019,6 +13019,11 @@ so it works with @command{zsh}, @command{bash}, and @command{ksh}, but not with @command{/bin/sh}. So if you write code like this in a shell script, be sure to start the script with @samp{#!/bin/bash}. +Note also that if any of the process substitutions (or piped stdout) +might exit early without consuming all the data, the @option{-p} option +is needed to allow @command{tee} to continue to process the input +to any remaining outputs. + Since the above example writes to one file and one process, a more conventional and portable use of @command{tee} is even better: @@ -13087,6 +13092,17 @@ tar chof - "$tardir" \ | bzip2 -9 -c > your-pkg-M.N.tar.bz2 @end example +If you want to further process the output from process substitutions, +and those processes write atomically (i.e., write less than the system's +PIPE_BUF size at a time), that's possible with a construct like: + +@example +tardir=your-pkg-M.N +tar chof - "$tardir" \ + | tee >(md5sum --tag) > >(sha256sum --tag) \ + | sort | gpg --clearsign > your-pkg-M.N.tar.sig +@end example + @exitstatus |