Programming :: Use If Else Condition When Returns Empty Data?
Apr 27, 2010Let say I would like to check /etc/profile whether defined umask 022
umaskcheck=$(What to defined here?)
if [ What to define here? ]
then
[code]....
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OpenSUSE Hardware :: Dmesg Returns Empty Output?
Sep 29, 2010When I type dmesg, it returns empty output.any idea why this would happen?anyone has tried fixing this problem?
View 2 Replies View RelatedProgramming :: Suspend Pthreads Without Condition
Jun 29, 2010I just started with Pthreads and don't really know much about it. I want to suspend pthreads but apparently, there is no such function as pthread_suspend. but I don't understand why we need both mutex and condition to suspend and resume a pthread. Is it possible to suspend and resume it without using conditions?
View 1 Replies View RelatedProgramming :: Awk: Swap Fields Given A Condition?
Oct 8, 2010I have a file records as follows:
Jane pepe@pepe.biz
john@pepe.net John
Joe joe@willxyz.org
How can I get that always first field be given name and second one be the mail address?
I've tried
Code:
awk '$1 ~ /@/ { a=$1 ; $1=$2; $2=a; print }' file
But that doesn't worked
Programming :: Iptables Script With For Condition?
Apr 28, 2010i have a question regarding the use of a statement, like following, in a iptables script.
Code:
BLOCKMAC="/root/mac.blocked"
MACS=$(grep -Ev "^#" $BLOCKMAC)
[code]...
Programming :: Update A Line Using AWK With Condition?
Jun 18, 2010i have a host file called myhosts.txt as follow:
Quote:
10.20.3.9 host1
10.20.3.10 host2
10.20.3.11 host3
[code]...
In my script, i am using NSLOOKUP to get the ip address of a host that just rebooted and connected to my network (this part has been done).But now i want to check the myhosts.txt file if the host has the same or different IP address, if is different then myhosts.txt file must be updated with the new IP.i am using the following AWk command:
Quote:
awk '/host4/{$1=val}{print}' val=10.0.3.4 /tmp/myhosts.txt
it prints on screen fine and i see the host4's ip address gets replaced but the actual file does not get updated with the new IP. I might need to use gsub?
Programming :: Bash: Repeat Commands Until A Condition Is Matched?
Mar 8, 2011need to modify some scripts to repeat the commands in them until a variable returns a proper value. I need it to add some redundancy to some scripts i use to upload files to a remote server.This is an example of a portion of those scripts:
Code:
################## site UPLOAD ##################
site_login=$(curl -c $site_cookie -L -F user=$site_user -F pass=$site_password -F
[code]....
Programming :: BASH Conditionals - Passing Condition As Variable ?
Sep 17, 2009I'm trying to implement an assert function similar to:[url]
However, I'm having trouble with file existence testing when the file name has a space in it.
I have distilled the problem down to the following:
This code works as expected, printing 'yes' if '~/test file' exists, and no if not.
Code:
However, this code gives an error.
Code:
The error:
Code:
Which tells me that it is splitting ["~/test file"] into ["~/test] and [file"]. Why? Is there a way around this?
Note that if you simply use a file path without a space, both cases work perfectly. Is this a BASH bug possibly? I just can't understand why the first would work, but the second wouldn't.
Programming :: Create Awk Sript For Generating Two Files From A File Checking A Condition ?
Mar 3, 2010I have a csv file like, having HDR segment and multiple LIN01 segment in each line:like
Here i want to split file in two, one having LIN01 segment which have LR at end, and one which have LF at end in LIN01 segment.
Is it possible to created awk or shell script for this?
OpenSUSE :: How To Restore Data Inside Trash After Make It Empty
Apr 25, 2011How can I restore the data inside the trash after make it empty ?I need to restore an important folder from the trash and I can't find it there.I am using openSUSE11.1 (KDE)
View 8 Replies View RelatedProgramming :: C++ - Basic Math Always Returns 0 ?
May 16, 2010Code:
Why are basic math problems returning 0? I know that Integers can only hold whole numbers, and it had the exact same problem when I used floats. I am using GCC 4.4.4.
Programming :: Setting Var Returns Command Not Found?
May 7, 2010I have the following function, and it appears to set the var correctly, but then tries and executes the line as a command. Anyone know how to keep it from doing that?
PHP Code: SMALL_FILE_PERCENTAGE=88
MEDIUM_FILE_PERCENTAGE=10
LARGE_FILE_PERCENTAGE=2
[code]....
Programming :: SSL_write Returns SSL_ERROR_SYSCALL, EOF On Second Call
Oct 8, 2010I am facing issue in my OPENSSL code. I have written openssl client. It sends request to the host and receives response for that request.
My problem is, it connects, sends request successfully to host at first time only in sencond attempt it fails on SSL_write(). where SSL_get_error() returns SSL_ERROR_SYSCALL error.
In that ERR_get_error() returns 0. man page shows "If ret == 0, an EOF was observed that violates the protocol".
Code Snippet.
w=SSL_write(SSLRequestData.ssl,c2s,c2sl);
switch(SSL_get_error(SSLRequestData.ssl,w))
{
case SSL_ERROR_NONE:
if(c2sl!=w)
[Code]....
Programming :: C++ Class Member Pointer Changes After Function Returns?
Mar 30, 2011I'm venturing into the world of OpenGL, but in the process of writing my graphics library I ran into a problem... My code is:
Code:
#include <stdio.h>
#include <stdlib.h>
[code]...
Programming :: C Language Fuction Returns : Where And How Is The Fuctions Value Stored
May 23, 2010I'm studying the C Language, None of the documents I'm reading covers returning values from a function. They state that the function sends the valve to the caller but that is the only info I have. Do I have to create a varible with the name of the function I called and is it stored there?
View 14 Replies View RelatedProgramming :: Inotify_rm_watch Returns EINVAL On Legitimate Call?
Jul 29, 2011I am working on software that is to run on a variety of linux machines where changing the os/version is not an option.My software uses the inotify_rm_watch call, and this is occassionally failing. In every case the operands are both valid, yet the result is EINVAL. This appears to only occurr when a watched file is deleted, and the read command on the inotify yeilds two events IN_DELETE_SELF AND IN_IGNORE (at the same time).I have seen a few messages detailing this same scenario - but no workarounds.
View 7 Replies View RelatedProgramming :: Query That Returns Columns Where Some Of The Values Are NULL
Dec 23, 2010If I have a Query that returns columns where some of the values are NULL, is it possible to tell SQL to return all the NULL values as empty strings instead of the NULL datatype?
If the solution is vendor specific I am (unfortunately) using a Microsoft 2008 SQL server.
Example:
Code:
Select * from imaginary_table where id = 1
Might return:
Code:
Id: 1
Name:xyz
[Code].....
Programming :: Struct Timeval Doesn't Keep After Function Returns
Jun 2, 2010int GetTime(struct timeval tv)
{
gettimeofday(&tv, NULL)
printf("%d
", tv.tv_sec); /* here is the right value */
return 0;
}
[Code]....
What happend? struct timeval has a self timer?
Programming :: Get Data From Serial Port Function Read() Blocks When Data Not Available?
Jun 11, 2009I am using read() in c++ to get data from a serial port. However, if no data is available on the serial port the function blocks until dta arrives.Example code:
//------------------------------------------------------------
char m_readBuffer[255] = {0};
char* p_curChar = m_readBuffer;
[code]...
Programming :: System() Routine Returns: Access: Unix Error (2) No Such File Or Directory
Oct 23, 2010I am running shell command through C program using system() routine.
I am executing "opcontrol --status" an executable using the this routine and I get the following error. access: unix error (2) No such file or directory
But when I give the complete path to the executable it runs perfectly.
The executable is installed in "/usr/local/bin/" And the path variable has this path.
Programming :: Create A Script That Returns A List Of The Users Who Have Never Changed Their Password From /etc/shadow
May 17, 2011I need to create a script that returns a list of the users who have never changed their password from /etc/shadow. As I know on linux there is a command "chage" used for find last password change.
View 2 Replies View RelatedProgramming :: Data Directory In Automake - Data Is Always Read-only ?
May 9, 2010I have some data files that should be distributed with my program. Using dist_pkgdata_DATA in Makefile.am, I get these files installed to /usr/local/data/share/package-name. The problem is that data is read-only, and my program needs to modify it. Playing with dist_sharedstate_DATA, dist_localstate_DATA, dist-data_DATA varibles, I got different installation directories, like /usr/local/com, usr/local/var, but data is always read-only.
How can I distribute modifiable data files with my package? I need some common directory for all users, or maybe local data in a user directory.
Programming :: In Correct File Is Empty?
Jun 17, 2010I am using embedded Linux. File open is successful. The file has all the permissions. It is present in current directory too. The size is about 27KB. But s.st_size says it is zero.
inputFileName = "abc.mp3";
FILE* inFile = NULL;
inFile = fopen(inputFileName, "r+b");
[code]...
Programming :: Delete Folder Not Empty C++?
Dec 5, 2009I'm using rmdir(), and everything goes ok if the directory is empty, ?how can I remove the entire tree when i have other files or directories in the folder that I want to delete?I've read about using "system(rm....)" but i REALLY want to do this without it, is it possible?
View 4 Replies View RelatedProgramming :: How To Check For Empty Variables In PHP
Apr 26, 2010I want to check if a MySQL db query will return an empty result - I first do this:
$query="SELECT * from <whatever" ;
$result=mysql_query($query) ;
$row=mysql_fetch_row($result) ;
Now how do I check if $row is empty or not? Will $row="" do the trick?
Programming :: Check If Buffer Is Empty In C?
Apr 12, 2011Greetings EveryOne
how to check if buffer is empty in c?
Programming :: Set The Record Separator To An Empty String?
May 4, 2010I tried to find out how awk works with multiline strings. I found this. I hope it will be useful for somebody. 1. I know that awk can searches simple patterns like '/^one/'
Code:
s="one
two
three"
echo $s | awk '/^one/'
2. I know that "Awk can handle multiline records by specifying the field separator to be a newline and set the record separator to an empty string." I've found it here
[Code]....
Programming :: Bash There Will Be Empty Lines At The End Of The File?
Mar 26, 2011Using awk I pull the first field of a random line from my datafile.myvar1=`awk -F" " 'NR=='$randline' {printf "%s", $1}' myfileThis works fine. The problem is there will be empty lines at the end of the file. Rather than using awkto filter out blank lines I would like to figure this out first.So I test $myvar1 for a blank string after setting $randline to one that I know is blank:test -z "$myvar1" && echo "true" || echo "false"But, this returns "false"? So the string is not zero length. Why? It's a tab-separated file. Is awk storing the tab with the $1 field or something.This is where I get headache. I try to echo my variable to see what it looks like.
echo "$myvar1"
outputs: nothing
echo "My variable is [$myvar1]"
outputs: [y variable is [
Why is the closing bracket at the beginning? What character could be stored in $myvar1 that would do such a thing and how did it get there?
Programming :: HOSTNAME Variable Is Being An Empty String
May 19, 2011The script produces 2 empty lines and I don't know why.
View 1 Replies View RelatedProgramming :: Check If An Array Is Empty In Perl?
Nov 28, 2008To do this, can I do this?:
if (@ary = ""),
or is something more needed?