Hi ,
I am having one situation in which I need to run some simple unix commands after doing "chroot" command in a shell script. Which in turn creates a new shell.
So scenario is that
- I need to have one shell script which is ran as a part of crontab
- in this shell script I need to do a... (2 Replies)
Hello
I want to make simple extension to vi , you know how you want to run some shell command
you do ":! ls -l " , then you go out the vi the command executed and then you hit enter and you back to vi
but now I want to be able to go out of vi and run several command outside of vi .. and in... (3 Replies)
Hi friends this is first post i am very new to shell scripting so i require your expertise to do the following thank u
I need to write a shell script which will run the following commands
pg_dump bank > backup(Enter)
Wait for bash prompt to appear coz it indicates that the command is... (23 Replies)
I want to write a script which would run from one host say A and connect to other remote host B and then run rest of commands in that host. I tried connecting from A host to B with SSH but after connecting to host B it just getting me inside Host B command prompt. Rest of the script is not running... (6 Replies)
I have to use shell script to run series of commands on another unix box by connecting through SSH and giving user credentials. For running commands on remote machine I have to use options reading from a local file.
Process:
Connecting to remote unix server <host1.ibm.com> through ssh
Login: ... (2 Replies)
The code below works, but takes too many lines and looks awkward:
db2 "export to $filename of del select * from $table with ur"|tee -a $LOGFILE|awk '/Number of rows exported:/ {print $5}' > numrows.tmp
numrows=$(cat numrows.tmp)
rm numrows.tmp
When I try the... (2 Replies)
Hi guys, so, I have a server running an sqlite database which is accessed by many client machines working as hardware testers, whenever something fails and needs to be replaced the operator would have to enter the Serial Number of the part being replaced as well as some other data. and... (0 Replies)
Hi all. On X11 I'm on a shell ...shell_1 (/bin/bash). From here I want to open another shell window shell_2 who executes commands like "ls -l" or programs like ". /program"... so the "result" of commands shows in shell_2 window and not in shell_1. Is that possible ? (4 Replies)
hi,
how to write shell script that runs different commands(like:ls,ps,ls-l) in differnt terminals(each command should run in different terminal).
my main motive is to run different 'c' program exe's available in different locations in different terminals.
thanks
sai (2 Replies)
Hi,
I am trying to make a Shell Script using which I will update around 10K records in MySQL db each night. For that, I am currently doing the following command in FOR LOOP:
mysql -D $MASTER_DB_NAME -h $MASTER_DB_HOST -u $MASTER_DB_USER -p$MASTER_DB_PASSWD -e "$SQL_Query"
This command is... (2 Replies)
Discussion started by: rahulmittal87
2 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)