it would be more appropriate if you try using the
instead of taking input in very simple format and then print the help menu once the user inputs a wrong data...
I am writing script in c shell and using this script to read the command line arguments, but it is not working. Pl. someone let me know what is the problem.
#!/bin/csh -f
if ($#argv <> 2) then
echo "you must give exactly two parameters"
else
set name1 = $argv
... (1 Reply)
I have to write a C program using sys call (read, no fread) to read from shell all the parameters, without know how many are them.
I tryed in some ways, but I have no success.
Any Idea?
Can I use read to read from stdin? (1 Reply)
In the make file
update updateq:
-------------------
----------
i want the makefile to display some messages when user gives "make update", but totally quite wehn user enters "make updateq". Can u tell me how to read these argument in makefile.
$1 doesnt work:( (3 Replies)
Hi, Guys
I am new to shell programming and just get stuck with one simple question. please kindly help.
According to the tutorial here, we can do something like
for NODE in "ABC 10" "EFG 20"
do
set -- $NODE
echo "letter is $1, number is $2"
done
And the result will... (3 Replies)
Hello everybody,
I'm coding a program in C and i'm getting troubles with this.
I need to read a config file and store the arguments into individual variables, let's say the config file looks like the following:
#This is the configuration file...
192.168.0.1 A1:B1:C1:D1:E1:F1
192.168.0.2... (2 Replies)
I have trouble getting this logic to work
#!/bin/bash
function assign_var(){
while
do
read -p "$2 :" $3
done
}
assign_var '$IPADDRESS' ipaddress IPADDRESS
Basicly, i want to make sure that entry is made (i can add more sophisticated checks later), but the idea is to recycle... (11 Replies)
I have the following piece of code. Currently the command line arguments are passed as shown below using the "= "sign. I capture the name of the argument, for example vmod and it's corresponding user parameter which is jcdint-z30.cmd.
./raytrac vmod=jcdint-z30.cmd srFile=jcdint.sr
Now I want... (12 Replies)
I am new to schell scripting . My objective is to write a ksh shell script that performs following tasks: -
1. Script reads all command line arguments (arguments are file names) and checks if it contains charachters "abc" in it.
2. If it contains "abc" it will execute a binary file xyz <command... (3 Replies)
Hi,
I need to get input arguments, as well as validate them. This is how I'm reading them:
#!/bin/bash
args="$@" # save arguments to variable
## Read input arguments, if so
while ; do
case $1 in
-v | --verbose ) verbose=true;;
-z | --gzip ) compression="gz";;
... (3 Replies)
Heays
So i have that script to which i'd like to pipe (rather than just regular arguments) some data from another virtual output command.
Simplified:
echo * | script.sh
When i know how many args i expect, i can handle this simple by:
&& \
read ONE TWO && \
set ONE TWO
echo "$1 : $2... (7 Replies)
Discussion started by: sea
7 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)