01-25-2018
Quote:
Originally Posted by
Corona688
What instructions are you following?
There's a bunch of places online that detail how to make bootable USB drives for Linux distros like Ubuntu on Mac. I can't post a URL, because it says I need to have at least 5 posts. It seems to be the only way to do it from Mac's terminal.
Quote:
Originally Posted by
Corona688
It makes little sense to dump a raw ISO to a partition, flash drive is not CDROM. A few odd boot systems do this, but usually you'd install to a flash drive like a hard drive.
I don't quite follow you here. I guess dd stands for dump something? All I knew is the command is able to make bootable media.
Quote:
Originally Posted by
Corona688
4M is fine. The point is that it's not left at the default of 512, which would be extremely slow.
I appreciate the suggestion, but I'm looking for a bit more of an explanation. I want to be able to work out an optimal number by myself.
You said 512(M?) would be slow. What about 256? What about 1M? What about 8M? I've seen various suggestions, but not much explanation.
Hopefully that makes sense.
Last edited by Quenz; 01-25-2018 at 08:06 PM..
Reason: Rewording
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LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$SHELL -c". This doesn't work as intended:
ssh host touch 'hi there' # fails
It creates 2 files, hi and there. Instead, do this:
cmd=`shell-quote touch 'hi there'`
ssh host "$cmd"
This gives you just 1 file, hi there.
process find output
It's not ordinarily possible to process an arbitrary list of files output by find with a shell script. Anything you put in $IFS to
split up the output could legitimately be in a file's name. Here's how you can do it using shell-quote:
eval set -- `find -type f -print0 | xargs -0 shell-quote --`
debug shell scripts
shell-quote is better than echo for debugging shell scripts.
debug() {
[ -z "$debug" ] || shell-quote "debug:" "$@"
}
With echo you can't tell the difference between "debug 'foo bar'" and "debug foo bar", but with shell-quote you can.
save a command for later
shell-quote can be used to build up a shell command to run later. Say you want the user to be able to give you switches for a command
you're going to run. If you don't want the switches to be re-evaluated by the shell (which is usually a good idea, else there are
things the user can't pass through), you can do something like this:
user_switches=
while [ $# != 0 ]
do
case x$1 in
x--pass-through)
[ $# -gt 1 ] || die "need an argument for $1"
user_switches="$user_switches "`shell-quote -- "$2"`
shift;;
# process other switches
esac
shift
done
# later
eval "shell-quote some-command $user_switches my args"
OPTIONS
--debug
Turn debugging on.
--help
Show the usage message and die.
--version
Show the version number and exit.
AVAILABILITY
The code is licensed under the GNU GPL. Check http://www.argon.org/~roderick/ or CPAN for updated versions.
AUTHOR
Roderick Schertler <roderick@argon.org>
perl v5.8.4 2005-05-03 SHELL-QUOTE(1p)