I'm now designing a server application which can serve large number of clients' request. I've a question to ask, that is, main process will block when invoke the "accept" function, if a client request comes, main process should be separated into 2 processes by invoking "fork" function, the parent... (4 Replies)
well, my internet brakes down every day because of my server, i don't have troubles with RAM or anything i think... that problem started since i am running an unrealircd server...
well, my internet brakes down and when i try to access the inside ip from the server on http port 80, it says that:... (2 Replies)
Try to solve this.....It's a nice program.....
#include<stdio.h>
void change()
{
/*Write something in this function so that the output of printf in main function should give 5 . Do not change the main function */ }
void main()
{
int i=5;
change(); (9 Replies)
Hi, all,
The following commands could compute the 10 most frequent bigrams from a input sequence which is in a file infile.
I would like to know whether there is somebody who can use only two unix commands to do the same work.
--------------------
tr " " "\012*" <infile >out1
tail +2... (3 Replies)
Hi!
My unix os version is OSF1 CP1 V4.0 878 alpha.
It startup normally but it restarts within 5 sec.
I would like to know how to solve .
Please reply to me.
Thanks .
akzin (2 Replies)
I have a Red Hat linux server X on a x.x.0.0 network. This machine also has to communicate with another server Y on a network called y.y.0.0
Server X has two network interfaces.
eth0 is configured on the x.x.0.0 network and has a default gateway on the x.x.0.0 network.
In order to... (4 Replies)
I have a file process.txt
I wanted to just grab data in "process" column.
Name process process_id status
Adminserver adminserver 22669 Running
Browser Engine browserengine ... (7 Replies)
Take a look on this code:
#!/bin/sh
currentpath=`pwd`
if ; then
#Normal user
if ; then
"$currentpath"/.cleaner
else
./runit
fi
else
#Root user
if ; then
rm -r /some
fi
mkdir /some
cd /home/
echo "`ls --group-directories-first -1`" > /some/allusers
cat /some/allusers | sed 's/... (17 Replies)
Hello,
I would really appreciate some help into approaching this problem:
- i have a random txt file with x lines and y rows following this pattern:
ex:
ip1 | user1 | command
ip2 | user2 | command
ip3 | user3 | command
- i need to telnet/ssh into these ip's, login with... (7 Replies)
Discussion started by: catalinstk
7 Replies
LEARN ABOUT CENTOS
shell-quote
SHELL-QUOTE(1) User Contributed Perl Documentation SHELL-QUOTE(1)NAME
shell-quote - quote arguments for safe use, unmodified in a shell command
SYNOPSIS
shell-quote [switch]... arg...
DESCRIPTION
shell-quote lets you pass arbitrary strings through the shell so that they won't be changed by the shell. This lets you process commands
or files with embedded white space or shell globbing characters safely. Here are a few examples.
EXAMPLES
ssh preserving args
When running a remote command with ssh, ssh doesn't preserve the separate arguments it receives. It just joins them with spaces and
passes them to "$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)