03-03-2011
Quote:
Originally Posted by
nandugo1
well!!! the same code I have been using since long time...and it never showed this error....
I'm reminded of something from space history... On opening an electronic module for inspection: "My god, this part passed all our tests and it's *garbage*!" Just because it
works doesn't mean it's sensible. And if you use "for stuff in `cat file`" all over the place? You've suddenly got something to worry about.
The error's always been possible, but somehow you've never fed it lines with spaces before, and never fed it files larger than you can squeeze into a variable. You've been lucky.
Because $i wasn't quoted, your awk line ends up
awk -v token=India and Australia are world champions in cricket '{print token "\t" $0}' token gets the "india" part. The rest of it -- "and", "australia", "are", "world", "champions", "in", and "cricket" -- awk tries to run as scripts or read as files.
Quote:
I am executing this on diff flavour of unix.....let me know any other way
I just did. Try it, it should work. It should be able to handle files of any size too, where your version will barf on files bigger than a few kilobytes on some systems.
Last edited by Corona688; 03-03-2011 at 01:55 PM..
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LEARN ABOUT DEBIAN
shell-quote
SHELL-QUOTE(1p) User Contributed Perl Documentation SHELL-QUOTE(1p)
NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)