01-10-2017
Hmmm, quite some questions in one post. And, I can't comment for all thoses OSes nor all shells, nor on shellcheck. For bash on linux and FreeBSD,
- You can have any number of redirections in a command line any place; they're evaluated left to right, and the last one will be effective. Check what >/tmp/1 cat file1 > /tmp/2 > /tmp/3 does.
- In your line > /dev/null 2>&1 cat /tmp/noise.raw > /dev/dsp it might be interesting to check where the error msgs go. What be your first guess?
- You don't need a command nor a NOP; >/tmp/1 will just open the file, empty it, and close it. This can be (and is) used to effectively create an empty file.
- That shellcheck comment seems to be a warning, not an error. shells allow for that construct.
- Your conclusion about non-existence of /dev/dsp from the permission error might be incorrect.
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LEARN ABOUT DEBIAN
pbuilder-dist-simple
PBUILDER-DIST-SIMPLE(1) General Commands Manual PBUILDER-DIST-SIMPLE(1)
NAME
pbuilder-dist-simple - simple multi-release pbuilder wrapper
SYNOPSIS
pbuilder-<dist> operation [...]
DESCRIPTION
pbuilder-dist-simple is a wrapper that makes it easy to use pbuilder with chroots for many different Ubuntu distributions. If you need
more features than pbuilder-dist-simple provides, have a look at pbuilder-dist(1).
USAGE
Create one symlink to pbuilder-dist-simple for each distribution for which you want a build environment, naming them like "pbuilder-lucid",
"pbuilder-natty", etc.
Replace operation with the action you want pbuilder-dist-simple to do (create, update, build, clean, login or execute).
EXAMPLES
pbuilder-natty create
Creates a pbuilder environment for Ubuntu Natty.
pbuilder-lucid update
Updates an existing Ubuntu Lucid environment.
pbuilder-lucid build ./sample_1.0-0ubuntu1.dsc
Builds the specified package on an already existing Ubuntu Lucid environment.
FILES
By default, pbuilder-dist-simple will store all the files it generates in ~/pbuilder/. This can be changed by modifying the BASE_DIR value
on the top of the script to any other directory you want. If the directory doesn't exit, it will be created at runtime.
SEE ALSO
pbuilder(1), pbuilderrc(5), pbuilder-dist(1)
AUTHORS
pbuilder-dist was originally written by Jamin W. Collins <jcollins@asgardsrealm.net> and Jordan Mantha <mantha@ubuntu.com>, and this man-
page by Siegfried-A. Gevatter <rainct@ubuntu.com>.
Both are released under the GNU General Public License, version 2 or later.
ubuntu-dev-tools February 25, 2008 PBUILDER-DIST-SIMPLE(1)