Programming :: String Comparison - [: =: Unary Operator Expected?

Nov 23, 2010

I would like to compare the nmlookup result of IP's stored in the file ips with a list of PC names stored in the file pcs.

for line in `cat "ips"`


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General :: "unary Operator Expected" Error Msg?

Nov 8, 2010

if [ $games -gt 0 ] ; then
echo ""
echo "*** New Game! ***"


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Programming :: Getting A Comparison Operator To Work?

Feb 8, 2010

I'm very new at Bash scripting and have a bone head issue that I'm trying (and failing) to resolve. I cannot get this one IF statement to work, it seems the comparison operator does not think the resulting number from the $b*$c+$b operation is an integer even though it is a number. Below is a small proof of concept script with the bit I'm having trouble with.

#! /bin/bash
if [ "$a" -le "$(echo "($b*$c+$b)"|bc)" ]


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Programming :: Operator For Floating Point Comparison?

May 10, 2011

I know it is wrong to use the "==" operator to compare the equality of two floating point numbers. Logically it would seem that if the "==" operator is not usable for floating point comparison, then the "<=" operator would also not be usable. Is this true? The lack of google search results on this topic made me think that it must be true. If that is true, then is it true that the only way to compare floats with <= or >= is with something like the code below? Code: bool smaller_than_or_equal(float a, float b) {

if ( fabs(a-b) < EPSILON){return true;}
else if (a < b) {return true;}
else {return false;}

} I think this is a general question, but if specifics are necessary, I am using the C++ language to code at the moment.

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Programming :: Script For Executing A Program And Doing String Comparison

May 6, 2009

I am fairly new to linux still and I'm currently trying to write a shell script (which I have never done) that is supposed to run the xrestop(like top) program. What I want to do is execute the program and check the identifier column to see if a certain program is running. If it is running I want to strip the data from that row of the terminal say every 5 seconds or so and put it in a text file. Is this going to be a complicated thing?

Heres a list of the columns when you run xrestop program res-base Wins GCs Fnts Pxms Misc PxmMem Other Total PID Identifier.

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Programming :: String Comparison - Get Regular Expression To Work In If / Else Statement?

Jun 29, 2010

how do I get this regular expression to work in an if/else statement? This is just a little script for learning BASH. don't be too harsh.

This script will test if a certain number of files with 1-4 in their filename exist and print their filename. An error message will be printed if not.

for i in `ls file[1-9]`
if [[ "$i" == *1-4 ]] ; then
echo "This file, $i, ends in a number between 1-4"
echo "Error, this file, $i, does not end with a number between 1-4"

I get this error. ./ 13: [[: not found

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General :: Bareword Found Where Operator Expected?

Oct 14, 2010

$dec93 = 93;
$ser = SERVO;
$lbit = uc(sprintf("%02x
", $dec93));
if($lbit == 5D){
print DATA "Byte11: $fbits11=$bstr11 Bits:[95-88] $ser

Why do I get this error? Bareword found where operator expected at C:Perl line 64, near "5D" (Missing operator before D?)

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Programming :: C++ Operator Overloading Within Already Overloaded Operator

Apr 16, 2011

I'm having a bit of an issue using overloaded operators in an already overloaded operator. In my following code, I have overloaded the && operator to compare two Course objects. The operator in turn goes to a function which calls other overloaded operators to compare private object variables of that object to compare them.

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Software :: Awk From End Of String - 3 Position Comparison

Oct 3, 2010

I would like to check if the 3rd character from the end of a string is a d or p using awk and the field seperator would not help for this problem, i.e.


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Programming :: Copy String A To String B And Change String B With Toupper() And Count The Chars?

Oct 22, 2010

copy string a to string b and change string b with toupper() and count the chars

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General :: String Comparison Error "user@host:~/scripts> ./ BIP1284I: Broker 'BRK1E' On Queue"

Jan 31, 2011

Here's my code on SLES v11.

#! /usr/bin/ksh
RUNNING="BIP1284I: Broker 'BRK1E' on queue manager 'BRK1QME' is running. BIP8071I: Successful command completion."
if ["$MQSILIST" == "$RUNNING"]; then
echo "Running."

Here's the error I receive. user@host:~/scripts> ./ BIP1284I: Broker 'BRK1E' on queue manager 'BRK1QME' is running. BIP8071I: Successful command completion. ./[8]: [BIP1284I: Broker 'BRK1E' on queue manager 'BRK1QME' is running. BIP8071I: Successful command completion.: not found [No such file or directory]

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Programming :: Can't Get The OR Operator To Work?

Apr 18, 2011

I'm having a bit of trouble getting the OR operator to work.This is the code that I have:

$vars["admin link"] = "<a href='/path/to/admin.php'>Admin</a>";
$vars["admin ip"] = "";
$vars["admin ip2"] = "";


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Programming :: TCL AND Operator (&) On A Binary Value?

May 1, 2010

I have a binary value which I receive from a controller. Say this binary value is 42. Just plain hex 42. If you would look at that byte in a debugger you would see 42.Now this value hold 8 bits each indicating a high or a low output. So 0x42 = 01000010b. Which means bits 1 and 6 are '1'.When I would want to find out which bits are set and which are not in a language like C, I simply do:


mask = 0x80;
if (binval & mask) {...}

However I am programming in TCL, and I try to do:


set mask 0x80
if { [expr ($binval & $mask) > 0] } {...}

this fails. At the moment the expr is executed, $binval is evaluated and substituted so the expression I am evaluating is


set mask 0x80
if { [expr ('B' & '0x80') > 0] } {...}

Eventually I got it working by converting the $binval into a '0x42' string value, like this:


binary scan $binval c byte
set byte [format "0x%0x" $byte]
set mask 0x80
if { [expr ($byte & $mask) > 0] } {...}

Then the expression yields what I want. But this seems so stupid and clumsy. Isn't there a better way where I can compare two binary values without conversions?

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Programming :: No Match For 'operator<<' In '((HttpRequest*

Jul 13, 2011

I have a simple program from book C++ cookbook, page 291, 8.3, Using Constructors and Destructors to manage resources (or RAII), but it can not get compiled in my g++

// Example 8-3. Using constructors and destructors
#include <iostream>
#include <string>
using namespace std;


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Programming :: Pthread - Take String From The Command Line And Creates A Thread To Print The String

May 3, 2011

I've been trying to understand pthread in C a little better. So I made a simple program that takes in a string from the command line and creates a thread to print the string. I've looked online and copied the basic concepts but there are something things I'm confused about. The programs works just fine, but I have questions. Here's what I have so far.


One thing I'd like to know is why the 3rd argument in the pthread_create function which is my SendMessage function needs to be typecasted to a void pointer and then send the address of the function. Also as for the 4th argument, I would see typecasting to void pointer in some of the pthread examples I saw online, but in my case I'm passing a char pointer, would this be correct? In which case would I ever want to pass a void pointer?

Do I need a pthread_exit(NULL) in my main and in the SendMessage function? If so, why? I added the sleep() function so that I could let the pthread_exit function in my SendMessage function execute first. I simply saw that the online examples on pthread had pthread_exit() in both locations.

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Programming :: Comparison Between Pointer And Integer

Jul 6, 2010

I'm trying to write a simple program that lists a menu and then asks you for your decision, and you can answer with a number or the name. However, I don't know how to add the second options (name).

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Debian Programming :: Square Bracket Operator?

Sep 1, 2014

Is there a way to achieve the following with the square bracket operator?I have a class:

Code: Select allclass A
    void SetValue(int index, Item* B);
    int m_iCount;
    ItemCollection Item_Collection;


The probelm is that I am not just blindly assigning whatever given on the right hand side to the returned value from operator [], I need to verify it's not NULL, and it is not already there in the Item_Collection, and I also need to increase the count.

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Programming :: C++ Cin Doesn't Wait For Input By Operator

Jan 4, 2010

I am trying to learn C++.I implemented a simple archive program, and I am in a situation in which the user is prompted by a menu to make a choice.So I have some cout instruction to illustrate the possible choices and then

int choice;

and everything works fine.I introduced this code in a "while" loop that checks wether the choice made by the user is valid or not:

bool check=true;
int choice;
if(the choice is valid) {...;check=false}
else cout<<"please make an other choice"

What is happening is that if by mistake the user introduces a character in place of a number, the loop repeats indefinitely because the program, when it get to the "cin" instruction, does not pauses to wait for a new input.

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Programming :: Print Increment Operator In Perl?

Apr 25, 2010

Can one of you point me towards a comprehensive print function tutorial in perl? I was under the impression that everything within quotes will get interpolated - but I am running into exceptions where it is not desirable to run some varaibles under quotes.
1 #!/usr/bin/perl
2 $idx = 1;
3 foreach $letter (a..z) {
4 print "Letter #",$idx++," is: $letter
5 #print "Letter # $idx++ is: $letter


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Programming :: Python Equivalent Of C Ternary Operator?

Jun 12, 2010

I've been reading and googling, etc. I've seen some things, but not a definite explanation of this. What is the appropriate way to mimic a C ternary operator using Python? Isn't there an exact proper way to do it? Any difference for using lambda functions? I'm sorry, but I've been searching and it's ambiguous to me how this should be handled. I would appreciate a person's help on this. I came up with this link, but I'm wondering if I'm missing something.[URL]...

So, is that it? In Dive Into Python, it's using the and-or trick. Well, if the above post is the full explanation,

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Programming :: Subscript Operator For A List Class?

Jun 27, 2010

how to overload the subscript operator ([]) for a list class?

template <typename T>
class list
struct node


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Programming :: Comparison And Breaking Out Of Loop Java?

Oct 10, 2010

my issue is that the when i put in the correct input its going into the loop like i put in incorrect input and wont break out of the loop even with the correct input entered

import java.util.*;
import javax.swing.*;


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Programming :: Ostream<< Operator With Double Variable Is Not Accurate?

Mar 27, 2010

I have tryed out this operator on program:


#include <iostream.h>
#include <iomanip.h>
#include <fstream.h>
ofstream myfile;


which definitly is not the same number. I guess somewhere in the convertion from double to char* ("<<") something is not right and what can i do to save these double numbers in an accurate manner in a file?

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Programming :: Using Sed Replace Line Containing Particular String By A Single String?

Oct 16, 2010

I have a set of lines as ahown below:

Leon went to school
Leon came back from school..
Leon had dinner...

I have to replace the line containing "dinner" by a single string LUNCH...

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Programming :: Creates String Suffixes Out Of A Reference String?

Feb 25, 2011

I need to creates string suffixes out of a Reference string. for eg. suffixes of abcdefg will be

and so on...

create an array of pointers to point to the first few characters and then use that pointer to print the rest of the string.But when i print using the pointer i get GARBAGE values! shudn't std::cout<<ptr[w] print the string following the char it is pointing to? why do i get garbage values?

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Programming :: C - Put A Specific Arbitrary Part Of A String Into It's Own String?

Apr 18, 2010

So if I'm given a location of a file like:

How can I just take the type of the file at the end? I know I can use strrchr() for a period to get the pointer to the period just before file type. Is there a build in string function that will just take the rest of the string from a certain point on forward in the string? I know it wouldn't be much work to make it myself, but I figured I would find out if it already existed before doing it.

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Programming :: Convert String To Integer Back To String C++ ?

Mar 13, 2010


The error is:


What I want to do is take input of ip4 as a string, convert it to an integer to add 1 to it, then reconvert it back to a string. Its not working.

My full code is:


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Programming :: Bash Scripting With File Date Comparison?

Mar 23, 2011

I need to be able to compare a file date with system date and delete files older than 30 days.

the file name is basically

of course the extension is the date the file was created.

Oh and before i get hammered I looked everywhere but am unable to make sense of what I found.

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Programming :: Bash Time Comparison Within A Fast Moving Log?

Jun 1, 2010

I have a bash script that is tracking ERROR connections (running in a cron every 15 minutes), sometimes the errors are true and are not connecting. But most of the time, the disconnects/reconnects are between 30 seconds are sending out false positives. I am looking for a time comparison code to pick out the 30 second disconnects and know that this is and "ok" error. Here is a section of the log with timestamps, errors, etc.

Tue 2010-06-01 22:01:30 ERROR [DataBufferSendService] caught exception: [NetworkAPI] Exception: [SocketStream] socket error
Tue 2010-06-01 22:01:32 ERROR [DataBufferSendService] caught exception: [NetworkAPI] Exception: [SocketStream] socket error
Tue 2010-06-01 22:02:00 INFO [Client] connecting to on port 8016
Tue 2010-06-01 22:02:02 INFO [Client] connecting to on port 8016

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Programming :: C++: Assignment Operator Copy All The Members Also For Structures Containing STL Objects?

Sep 26, 2010

does the assignment operator copy all the members also for structures containing STL objects strings,vectors,vectors of vectors...)? I did try it on my platform,and it works that way (copying all the fields),but i was wondering if it is a standard behavior or not.

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