Perl - backticks v system in if statements Post: 79741

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Backticks within backticks?

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...

2. Shell Programming and Scripting

Am I abusing backticks?

I'm always concerned I might be abusing backticks within my scripts. A current script I'm writing has this for example: stripscriptname=`echo $scriptname | sed 's/$.*$\..*/\1/'` stripsearch=`echo $searchpattern | tr -d ' ,/'` Both of these variables are set inside the script (in fact,...

3. Shell Programming and Scripting

use statements and system glitch

hi, i have a perl script that runs as a cron job... Once in a while, the perl script fails with: Can't locate <module>.pm in @INC (@INC contains: .............) because one of the perl modules specified in the "use" statements is unavailable due to an NFS glitch. Is there some...

4. Shell Programming and Scripting

perl if elsif statements

I have having problems with an IF statement in my perl script: if ($model eq "N\\A") {} elsif ($kernel =~ m/xen/) { $model = ("Virtual Machine\n")}; What i am trying to accomplish is if the model is set to "N\A" and the kernel variable has xen somewhere in it i would like to change...

5. Programming

String if statements - Perl

So far, all I have been able to come up with is: if ($check=~/no/ || $check=~/n/) but the problem with this, is that it looks for any character and the if statement is true. So if I wanted to check for an argument "-help" or lets say a variable string that could be a file name. Then...

6. Red Hat

perl backticks: can't redirect output.

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...

7. Shell Programming and Scripting

[solved] using backticks to call bash from perl

Hi all, Here is my code: my $x = `bash -c \" ls -l filename | awk '{print \$5}'\"`; print "$x\n"; This will run the first part of the bash script but not the awk command. It therefore gives output of: -rw-r--r-- 1 root root 13619200 2012-04-25 08:16 filename I am actually trying to...

8. Shell Programming and Scripting

SSH and Backticks [solved]

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...

9. Shell Programming and Scripting

Nesting backticks

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...

10. Shell Programming and Scripting

Perl combine multiple map statements

I have a file like file. file.TODAY.THISYEAR file.TODAY.LASTYEARI want to substitute the words in caps with their actual values so that output should look like file.140805 file.140805.2014 file.140805.2013For this I am reading the file line bye line in an array and using multiple map...

LEARN ABOUT PHP

intdiv

INTDIV(3)								 1								 INTDIV(3)

intdiv - Integer division

SYNOPSIS

       integer intdiv (integer	$numerator, integer  $divisor)

DESCRIPTION

	Returns the integer division of $numerator by $divisor.

PARAMETERS

	      o $numerator
		- Number to be divide.

	      o $divisor
		- Number which divides the $numerator

RETURN VALUES

	The  integer  division	of  $numerator	by  $divisor.  If $divisor is zero, it throws an E_WARNING and returns FALSE. If the $numerator is
       LONG_MIN (- PHP_INT_MAX - 1) and the $divisor is -1, it returns zero.

EXAMPLES

       Example #1

	      intdiv(3) example

	      <?php
	      var_dump(intdiv(3, 2));
	      var_dump(intdiv(-3, 2));
	      var_dump(intdiv(3, -2));
	      var_dump(intdiv(-3, -2));
	      var_dump(intdiv(PHP_INT_MAX, PHP_INT_MAX));
	      var_dump(intdiv(-PHP_INT_MAX - 1, -PHP_INT_MAX - 1));
	      var_dump(intdiv(-PHP_INT_MAX - 1, -1));
	      var_dump(intdiv(1, 0));
	      ?>

	      int(1)
	      int(-1)
	      int(-1)
	      int(1)
	      int(1)
	      int(1)
	      int(0)

	      Warning: intdiv(): Division by zero in %s on line 9
	      bool(false)

PHP Documentation Group 														 INTDIV(3)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Backticks within backticks?

Discussion started by: jeriryan87

2. Shell Programming and Scripting

Am I abusing backticks?

Discussion started by: mglenney

3. Shell Programming and Scripting

use statements and system glitch

Discussion started by: Andrewkl

4. Shell Programming and Scripting

perl if elsif statements

Discussion started by: insania