04-04-2005
Quote:
Originally Posted by mosqueda_albert
I want to build this to help me learn more on Networks in Unix, because I believe this environment is a lot more stable than the Window technologies in the market.
BTW, some of the best UNIX and Linux people in the world use Windows XP as their workstation and UNIX or Linux as their "back-in" servers. See this quote from one of the vBulletin developers:
Quote:
So, what your secret weapons -- your favorite development tools? What operating system do you use most and why?
As far as operating systems are concerned, any machine I expect to sit down in front of and work runs Windows 2000 or XP, whereas all my servers run various flavours of Linux. I feel that, with this setup, you have the best of both worlds, and while I wouldn't consider connecting a Windows machine directly to the Internet as a server, I would be equally opposed to sitting in front of a Linux machine to run my various desktop applications. Maybe that's just a matter of taste, but I feel that is where the respective systems' strengths lie.
Reference - Interview - Kier Darby of vBulletin
The motto, to be a great lover of UNIX and Linux, you don't have to bash Microsoft. In golf, there are many different clubs in the bag.... and in your toolbox there are lots of different tools.... use them all wisely
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LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)
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 v5.16.3 2010-06-11 SHELL-QUOTE(1)