This is tested in bash, but a recent ksh offers the central functionalities as well:
Code:
{ exec 4<&0; { exec 3<&0; while read -u3 -d" " A && read -u4 -d" " B; do echo $A $B; done; } <<< $group1" "; } <<< $group2" "
Joe Kim
Brian Annie
John Kate
Mark Anna
EDIT: Actually, the file descriptor 3 stuff can be omitted and the normal stdin be used.
Another question, is it possible to, in a for-loop incrementing until it reaches a certain number, to have it loop again without incrementing? Just have it drop what it is doing when it reaches this command and start again at the same number it was at? I know I could make a while loop and just... (0 Replies)
Hi All,
I amlearning UNIX scripting. I have a small query. I would be thankful if any one helps me out.
I have a below piece of code which delets the files. If file dosent have the permissions to delete a particular file I have used 2>>operator to track the error code.
But my objective is... (1 Reply)
I wonder how to stop further loop iterations when conditions gets false e.g.
This file.txt contains the following structure :
1
2
3
4
5
6
7
8
9
10
How to stop iteration when if statement gets false ?
for n in `cat file.txt`
do
if (( n<=5 )) (1 Reply)
question :how can i iterate to next item in for loop with the loop
e.g
for i in `cat abc.txt`
do
echo $i // this will display first line
i=$i+1; // this doesnt work for me.
echo $i; //this will display secound line
done
question: is my approach to manipulate text good?
I have... (3 Replies)
I have written the following script to update some Debian boxes.
#!/bin/bash
mxg_hosts_file="/etc/mxg/ssh-hosts"
while read line ; do
mxg_host="$(echo ${line} | awk -F":" '{print $1}')"
mxg_port="$(echo ${line} | awk -F":" '{print $2}')"
echo "Connecting and Upgrading... (3 Replies)
for VGLIST in `lsvg -o`
do
CLOSED_OUT=`echo $VGLIST | lsvg -l $VGLIST | awk '{print $6 " " $7}' | grep closed`
if ]; then
echo "Filesystems $CLOSED_OUT in VG that are in Closed status"
else
echo "\n Some message"
fi
Above Code is working fine, but echo "Filesystems $CLOSED_OUT... (8 Replies)
I have a script with logic like:
my_function()
{
if
mkdir $1
mkdir mydir_${2}
else
do something else
fi
}
read in list of items
while read list
do
my_function $list `date`
done
so basically it will make a directory for every name in the list and create a directory with the... (6 Replies)
bash in RHEL 6.4
I have a requirement in which I want to get the iteration count from a WHILE LOOP.
The below mentioned simple script test.sh works fine. In the below script, the WHILE loop will iterate every 5 seconds infinitely until it greps the string BASKETBALL from /tmp/somestring.txt... (6 Replies)
I am trying to check multiple server's "uptime" in a loop over "ssh".
When I execute multiple ssh commands with hard coded servernames script is executing fine.
But when I pass server names using while loop, script is exiting after checking first server's status, why?
# serverList... (8 Replies)
Hello,
I've written a script to automate encoding of all the MP4 files in a directory (incl. subdirectories). But unfortunately it's running for the first MP4 file only.
My machine details:
root@Ubuntu16:~# uname -a
Linux Ubuntu16 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48... (2 Replies)
Discussion started by: prvnrk
2 Replies
LEARN ABOUT DEBIAN
io::async::loop::glib
IO::Async::Loop::Glib(3pm) User Contributed Perl Documentation IO::Async::Loop::Glib(3pm)NAME
"IO::Async::Loop::Glib" - use "IO::Async" with Glib or GTK
SYNOPSIS
use IO::Async::Loop::Glib;
my $loop = IO::Async::Loop::Glib->new();
$loop->add( ... );
...
# Rest of GLib/Gtk program that uses GLib
Glib::MainLoop->new->run();
Or
$loop->loop_forever();
Or
while(1) {
$loop->loop_once();
}
DESCRIPTION
This subclass of "IO::Async::Loop" uses the "Glib::MainLoop" to perform read-ready and write-ready tests.
The appropriate "Glib::IO" sources are added or removed from the "Glib::MainLoop" when notifiers are added or removed from the set, or when
they change their "want_writeready" status. The callbacks are called automatically by Glib itself; no special methods on this loop object
are required.
CONSTRUCTOR
$loop = IO::Async::Loop::Glib->new()
This function returns a new instance of a "IO::Async::Loop::Glib" object. It takes no special arguments.
METHODS
There are no special methods in this subclass, other than those provided by the "IO::Async::Loop" base class.
$count = $loop->loop_once( $timeout )
This method calls the "iteration()" method on the underlying "Glib::MainContext". If a timeout value is supplied, then a Glib timeout will
be installed, to interrupt the loop at that time. If Glib indicates that any callbacks were fired, then this method will return 1 (however,
it does not mean that any "IO::Async" callbacks were invoked, as there may be other parts of code sharing the Glib main context. Otherwise,
it will return 0.
SEE ALSO
o Glib - Perl wrappers for the GLib utility and Object libraries
o Gtk2 - Perl interface to the 2.x series of the Gimp Toolkit library
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2013-03-01 IO::Async::Loop::Glib(3pm)