05-12-2007
Quote:
Originally Posted by Perderabo
There are some other approaches to this. ...
A very creative approach. Excellent! And without touching any files!
6 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
Can anybody provide me Pointers to Practice tests or any Material to prepare for Brainbench certification in Unix Shell Scripting? Also how good is this Certification for UNIX programmers. Is it worth it? I'm planning to take this certification in 2 weeks. Kindly let me know all the pros... (0 Replies)
Discussion started by: pavan_emani
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2. Shell Programming and Scripting
Hi gurus,
I have done my best to be as precisely as possible with this.
Besides giving the format of file a and file b and the result file
I have also given the algorithm as I have figured out.
I will try to do this and I hope that some of you could help
me to solve this or better yet... (1 Reply)
Discussion started by: ljankok
1 Replies
3. Programming
Hi Gurus,
To the Brain Teaser, if I add another condition, say the executable should not be altered, how the program should be altered? (no perl please, purely C). I forgot to mention this condition my staff had mentioned. ( forgot then and got now :D )
The program executed the first time... (4 Replies)
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4. What is on Your Mind?
A global group of scientists are spending the next ten years and a billion dollars to try and develop a computer simulation of the brain:
https://www.humanbrainproject.eu/
I always found it fascinating that the brain can understand itself. This almost sounds like in a few years the computer... (0 Replies)
Discussion started by: figaro
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5. Shell Programming and Scripting
G'day,
Here's a teaser for a sed guru, which I surely am not one, as even my
basic sed skills are rusted from years of not practising ... lol
Ok ... we have a string of digits such as:
632413741610252847552619172459483022433027602515212950543016701812771409213148672112
we want it split... (9 Replies)
Discussion started by: naderra
9 Replies
6. What is on Your Mind?
Working on a new cybersecurity, dystopian world series and made a short 2 min teaser today.
Cyber Dystopia (720 HD)
https://www.youtube.com/watch?v=g9Ca07J_YC8
If anyone has any ideas for the story, please write out some story lines in the comments and join the production team! (1 Reply)
Discussion started by: Neo
1 Replies
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)