01-08-2011
IMHO, understandong [icode]|[\icode] (aka, the "pipe") is fundamental for using UNIX. As is understanding standard-input and -output.
While this is a bit of a simplification,
commandA | commandB is functionally equivalent to
commandA > tempfile; commandB < tempfile; rm tempfile, but without the overhead of creating, reading, writing, and removing
tempfile. Also, both commands are run simultaneously.
So for:
Quote:
Originally Posted by
PAKumar
What is the exact different between both:
1C) echo D | ./testconnectiontoDB
2C) ./testconnectiontoDB | echo D
You are correct in:
Quote:
Originally Posted by
PAKumar
As per my knowledge by using (1C) D option will be taken and it will get posted to the script it is running right as part of execution? (If I am wrong correct me ..)
Although I would say:
D\n (the character "D" followed by a newline character) is written to stdout of
echo, which is read by
testconnectDB.
Quote:
Originally Posted by
PAKumar
In Second option (2C) .. why it wont work in the sameway ..
As per the
echo manual page, only output is sent to stdout, nothing is ever read in. So what ever was generated by
./testconnectiontoDB was lost.
Hope this helps.
-- MDL
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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)