Can someone explain the difference between backticks and system when
evaluated in these if statements:
sub getDate {
print "start date\n";
if ( system("/bin/date") ) {
print "can't get date\n";
exit(2);
}
print "finish date\n";
}
Returns the following:
start date
Thu... (5 Replies)
Hi, I'm trying to do something like this: range= `expr `date '+%m'` - 1` and it does not work. How can I tell it to evaluate an expression within another expression evaluation? I was at first worried that `date '+%m'` would return a string but apparently expr does the math okay normally, so the... (3 Replies)
Hey all. Just a fast question, what is the technical difference between using back ticks and using xargs to perform a command?
Here's an example
Find /mydir -name *.conf |xargs rm
Vs
Rm 'find /mydir -name *.conf'
Is there a performance hit? I know they do the same thing but which is... (1 Reply)
Hi everyone. This is a bit of a perl/linux mixed question. I am trying to redirect STDOUT of chsh by using the following line of perl code.
system ("chsh -s /sbin/nologin $testing 1>/dev/null");
This should redirect STDOUT to /dev/null but it won't do that for some odd reason. Any ideas or... (6 Replies)
Input file:
'data_1'
'data_10'
'data1311'
'235data_13'
Desired output:
data_1
data_10
data1311
235data_13
Can I know how to remove back tick"'" in a file?
Many thanks for advice. (3 Replies)
I have been testing a new script and cannot figure out why my `cat spath` will not execute on the remote machine?
sudo ssh -p 22344 -o "PasswordAuthentication no" -o "HostbasedAuthentication yes" -l testuser 192.168.1.6 "find `cat spath` -depth"
cat: spath: No such file or directory
but... (0 Replies)
Discussion started by: metallica1973
0 Replies
7. Forum Support Area for Unregistered Users & Account Problems
The forums have been seeing a sharp increase in spam bots, forum robots, and malicious registrations from certain countries. If you have been directed to this thread due to a "No Permission Error" when trying to register please post in this thread and request permission to register, including... (1 Reply)
I'm trying to make a dialog window that prints the output of grep that takes the output of find. Unfortunately my nested backticks don't work.
Here is the dialog window:
dialog --stdout --title "test" --backtitle "test" --msgbox "Test:\n `grep -l "${tablica}" `find $string``" 16 60I think I... (2 Replies)
Discussion started by: Starting_Leaf
2 Replies
LEARN ABOUT DEBIAN
bind::config::parser
BIND::Config::Parser(3pm) User Contributed Perl Documentation BIND::Config::Parser(3pm)NAME
BIND::Config::Parser - Parse BIND Config file.
SYNOPSIS
use BIND::Config::Parser;
# Create the parser
my $parser = new BIND::Config::Parser;
my $indent = 0;
# Set up callback handlers
$parser->set_open_block_handler( sub {
print " " x $indent, join( " ", @_ ), " {
";
$indent++;
} );
$parser->set_close_block_handler( sub {
$indent--;
print " " x $indent, "};
";
} );
$parser->set_statement_handler( sub {
print " " x $indent, join( " ", @_ ), ";
";
} );
# Parse the file
$parser->parse_file( "named.conf" );
DESCRIPTION
BIND::Config::Parser provides a lightweight parser to the configuration file syntax of BIND v8 and v9 using a "Parse::RecDescent" grammar.
It is in a similar vein to "BIND::Conf_Parser". However, as it has no knowledge of the directives, it doesn't need to be kept updated as
new directives are added, it simply knows how to carve up a BIND configuration file into logical chunks.
CONSTRUCTOR
new( );
Create a new "BIND::Config::Parser" object.
METHODS
set_open_block_handler( CODE_REF );
Set the code to be called when a configuration block is opened. At least one argument will be passed; the name of that block, for
example "options" or "zone", etc. as well as any additional items up to but not including the opening curly brace.
set_close_block_handler( CODE_REF );
Set the code to be called when a configuration block is closed. No arguments are passed.
set_statement_handler( CODE_REF );
Set the code to be called on a single line configuration element. At least one argument will be passed; the name of that element, as
well as any additional items up to but not including the ending semi-colon.
parse_file( FILENAME );
Parse FILENAME, triggering the above defined handlers on the relevant sections.
TODO
Probably the odd one or two things. I'm fairly sure the grammar is correct.
COPYRIGHT AND LICENSE
Copyright (c) 2005 Matt Dainty.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
AUTHORS
Matt Dainty <matt@bodgit-n-scarper.com>.
SEE ALSO
perl, Parse::RecDescent, BIND::Conf_Parser.
perl v5.14.2 2005-06-26 BIND::Config::Parser(3pm)