im trying to run the below if command
ifconfig -a |grep 10.100.120.21
gives me below output
inet addr:10.100.120.21 Bcast:10.100.120.255 Mask:255.255.255.0
i just want a basic shell which says if above exists then continue
how would i do this? (6 Replies)
In bash scripts please can someone tell me if the below is the correct syntax for comparing integers and strings;
for integers -
if ;then
for strings -
if ; then
Thanks
Calypso (4 Replies)
hi,
I am new script learner,
so my basic doubt is ,
how to store value of any command in a variable example
$ ls | wc -l
i want to stote the output of this in a variable c.
so that i can use c in if else loop.
and when do we use " ` " symbol in script..
can anyone also tell for... (5 Replies)
Lets say I wanted to create a script that would show what people are doing on my machine using the w command and refresh in about 6 seconds. What would be the easiest way to do this? I pretty much want the script to loop until I stop it.
I'm using the BASH shell by the way.
Help is appreciated.... (1 Reply)
Im trying to make a script that simply adds a word to the last available line in a txt file without overwriting any previous lines.
Ive googled this and there are great examples but no one explain what each function does, and i dont entirely understand how it works.
Basically Im looking for... (7 Replies)
Hey everyone, just now joined because I didn't want to go onto Ubuntu forums and start asking about how to write shell scripts. Seems like this is a pretty active forum for exactly what I need.
I'm trying to modify a shell script I found online, the end goal is to have it find all files in the... (9 Replies)
I need to have a script read a file that has a list of words in a single column like below:Black
Blue
Brown
Orange
Red
Yellow
Green
White
Purple
Silver
Grey
Tan
Then print to another file just all of the two-word possible combinations. Example:
Black,Blue
Anyone want to take a... (4 Replies)
Hello,
This is basic (i think). I am trying to run a shell script which would go into each folder (folder names defined in the list) and after entering would run some commands, once done, come out of the folder and continue until the list ends.
Pretty basic and there are bunch of example online. ... (9 Replies)
Hi everyone, first time visitor to these forums here.
Keeping a long story short I've been attempting to learn how to code in bash. I have VERY little previous experience with coding languages besides simply copying and pasting batch scripts for Windows. So, with that in mind I've followed a... (4 Replies)
Discussion started by: Meta
4 Replies
LEARN ABOUT DEBIAN
heap::elem::num
Heap::Elem::Num(3pm) User Contributed Perl Documentation Heap::Elem::Num(3pm)NAME
Heap::Elem::Num - Numeric Heap Elements
SYNOPSIS
use Heap::Elem::Num( NumElem );
use Heap::Fibonacci;
my $heap = Heap::Fibonacci->new;
my $elem;
foreach $i ( 1..100 ) {
$elem = NumElem( $i );
$heap->add( $elem );
}
while( defined( $elem = $heap->extract_top ) ) {
print "Smallest is ", $elem->val, "
";
}
DESCRIPTION
Heap::Elem::Num is used to wrap numeric values into an element that can be managed on a heap. The top of the heap will have the smallest
element still remaining. (See Heap::Elem::NumRev if you want the heap to always return the largest element.)
The details of the Elem interface are described in Heap::Elem.
The details of using a Heap interface are described in Heap.
AUTHOR
John Macdonald, john@perlwolf.com
COPYRIGHT
Copyright 1998-2007, O'Reilly & Associates.
This code is distributed under the same copyright terms as perl itself.
SEE ALSO Heap(3), Heap::Elem(3), Heap::Elem::NumRev(3).
perl v5.8.8 2007-10-23 Heap::Elem::Num(3pm)