Programming :: Watching File Contents Continously?
May 27, 2010
want to watch the file continoulsy for any newly written data to file.Presently i am periodically opening the file and checking for the newly updated contents.Is there something like refresing the file descriptor, since open is a system call, calling it many times may affect performance. Does the tail program opens file multiple times to check for the updated contents when used with -f option.Can some one explain or give some links on how the filedescriptors remembers its end contents while some other programs keeps updating the file.
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Nov 17, 2008
I have two files list1.cfg and list2.cfg both files contains differentrecords details like
List1.cfg
NAME1:25:C:NAME LINE1:
NAME2:25:C:NAME LINE2:
CITY:25:C:City:
[code]....
Now I want to append contents list2.cfg to list1.cfg(It ispposible using cat list2.cfg >>list1.cfg) but I want to check if content of (record) in list2.cfg is present in list1.cfg then dont append it otherwise append it.
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Jul 16, 2011
A long time ago I wrote a short essay about the 'federal' 'reserve' board. I don't remember it's name or format. I think it's somewhere on my rather large hard discs (to of them divided into various partitions).I'm trying to write a command line that will find it based on a quote that is in it: "our fathers brought forth"I have tried various configurations of grep, and or combining grep with find, but I'm getting nowhere. I really don't understand the syntax of either command, or how they work together, and the examples that I can find are really no help at all.
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Jan 11, 2010
I am trying to read the contents of a file into something else. I have a file.txt that I am working with, I want to read the file and take the data and run some commands with the data that it read. So if it read www.yahoo.com I want to be able to nslookup. Does that make sense? I have been trying to use the read command but that does not seem to work. I even was trying to read filename | > filename to see if I could even read any of the data at all. Nothing is working.
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Nov 4, 2009
i am trying to write a bash script. i have a text file called comp2.tmp which has a list of items in it
example comp2.tmp
Code:
filename.pdf
filename2.zip
filename3.ttf
and so on
I have another text file called comp1.tmp which should have the same list of files in it, but does not look as pretty
example comp1.tmp
Code:
someothertext here ...... 10/30/2009 ...... filename.pdf
=========================------------------==============
othertextagain .......... 09/28/2008 ...... filename2.zip
========================------------------===============
bunchmoretext ........... 04/12/2005 ....... filename3.ttf
and so on
i would like to check if the filenames listed in comp2.tmp exists in comp1.tmp
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May 18, 2010
I want to list the contents of a zip file amd put each entry into an array. I've been doing
[code]....
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Jan 22, 2011
How can read the file /var/etc/allInOne.cfg and distribute its contents on multiple cfg files using C language. /var/etc/allInOne.cfg contain the data and the path of each text file.
The source file "/var/etc/allInOne.cfg "look like this:
line1
line2
...
line10
filePath:/var/etc/file1.cfg
line12
line13
...
line14
filePath:/var/etc/file2.cfg
linen
..
filePath:/var/etc/filen.cfg
the result will be :
The expected result is:
/var/etc/file1.cfg will contain line1 to line10
/var/etc/file2.cfg will contain line 12 to line13
/var/etc/filen.cfg will contain linen to linen-1
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Jun 10, 2010
I have multiple HTML files in a folder. there is a <h2> tag like this:
Code:
<h2>some text</h2>
in each file. I want to write a shell script/batch file to add this tag in <head> section of each file:
Code:
<!-- TITLE= "same text from h2 tag" -->
Note that <h2>some text</h2> in some files has 1 or more linebreaks and so I couldn't capture tag content using a simple grep or...
for example:
<h2>first part of text
second line of text</h2>
The line break shouldn't be shown in <!-- TITLE= "same text from h2 tag" -->. The script has to capture tag content & skip line breaks.
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Nov 23, 2010
My problem is that last night, when I was watching some .swf file in firefox, the computer slowed down to the point of my not being able to do anything about it. I shut the computer down and restarted to handle the problem. This worked the first few times, and proceeded to really turn out bad later on.
Now, I have windows and ubuntu on the same hard drive. Whenever I select ubuntu, I get a message saying "GNU GRUB version 1.98-1ubuntu8" and some stuff about how limited Bash-like commands are supported. I can also his tab to do stuff. By using the help command for everything, I have determined that the command "linux" is supposed to load linux and "boot" is supposed to load an OS. Everytime time I pick a command that should load something, it says that I need to load a kernal.
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Oct 14, 2010
I want to be able to check the contents of a text file for a specific string and remove it from the file from the command prompt. I would basically be searching through a number of files and if a specific string is found I would like it removed automatically. pretty much a find and replace, were the replace is nothing. any one got any ideas on how you would do this. I already have the search part sorted just need to be able to remove the string I don't want from the multiple files.
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Jul 12, 2010
We have some large files with sampling data in it. Don't want to delete these files. But want to quickly overwrite the file with 0s and/or 1s and preserve the original file size.
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Jun 15, 2010
I would like to know how I can replace a string in one file with the complete contents of another life.
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Sep 25, 2010
someone once told me that use can pass a file to grep and use that to search the contents of another file. if that is the case I'm not entirely sure why the following isn't working for me.
Code:
[root@LCENT01:~]#grep -i id_rsa.pub .ssh/authorized_keys
[root@LCENT01:~]#cat id_rsa.pub >> .ssh/authorized_keys
[root@LCENT01:~]#grep -i id_rsa.pub .ssh/authorized_keys
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Dec 27, 2010
How to get the contents of a directory in C++?I know about opendir(), but I wonder if there is a C++ way (that uses classes and exceptions).
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Jun 28, 2011
When I eject CD from CDROM by pushing eject button(mounted on CDROM) it still shows CD and it's contents in nautilus file browser. If I replaced the CD it still shows contents of older CD. If I eject CD manually by file browser then there is no such issue. I know this is the kernel issue because this issue has come after updating my kernel from linux 2.6.33 to linux-netbook-2.6.35. I am using MeeGo. I want to know which kernel parameter(or module) I have to add.
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Aug 2, 2010
I'm having trouble figuring out how to list the contents of a directory and exclude any subdirectories.
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Oct 3, 2009
I am in the process of writing a program that plays the game mancala. I wanted to create a function that requires the player to choose a number between one and six, should be simple right? I kept having problems, so I started testing stuff out.
Code:
#include <stdio.h>
#include <stdlib.h>
short move();
[code]....
I am using gcc version 4.3.2 (Debian 4.3.2-1.1). On a whim, I tried something else out; when I change the 'short' variables to 'int' , the problem seems to dissapear.... I tried changing the format string in the scanf statement from "%d" to "%u" which is listed as the appropriate string for the 'short' type, still no luck.
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Jul 29, 2010
In Ubuntu 10.04, there is a certain file that appears highlighted in terminal. When I try to cat the file, it says there is no such file or directory. How can I see what's in this file? Is this a symbolic link?
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Feb 24, 2010
how do I print out the contents of a file?
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Mar 23, 2010
/root/.local/share/Trash/files/I have a tar backup file in there and can't get rid of it. I've tried from root with Nautilus, the files disappear for a couple of seconds and then reappear.
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Apr 30, 2010
EDIT:SOlved, I'm trying to figure out how to delete this
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Sep 1, 2011
I know that I can do something along the lines of
Code:
touch /var/www/index.html | echo "echo some contents" >> /var/www/index.html
but would like to do this without having to specify the directory again with echo, and maybe even use linebreaks / tabs on the echo in. Anyone know a neat one liner?
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Oct 20, 2009
how to do the listing of zip file contents using C?
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Jun 8, 2011
is there any API to read content of PDF file & store it in buffer?
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Feb 1, 2011
I'd like to change contents in a *.tgz file. I can uncompress (extract) using:
Code:
tar xzf archiv.tgz
and I get these 3 directories:
Code:
etc
install
usr
How to compress back to a tgz file?
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Sep 30, 2010
I have created an incremental backup of a Windows-client folder on a SLES 11 server using find and tar. The resulting file is about 615 MB, but inside the archive is only one file which has a file size of only 9.061 Bytes. BTW: it's a "The Bat!" config fileHere's the backup script:
Code:
Configuration
BACKUPFILE1="/<some_name>/Thunderbird"
[code]...
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Mar 3, 2010
I have an ISO CD image file and want to extract it's contents to a folder. I know there are ways to mount the image and stuff, but it's complicated. I'm looking for a GUI tool to open up the contets and extract needed files. On windows I would use WinRar to do this. K3B only allows me to burn the stuff, Arch does not work with ISO files :(Is there a similar tool on Linux, preferably from KDE world?
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Apr 20, 2010
I have a .bkf backup file, created by the Backup utility that Microsoft provides with Windows XP. Is there a way to read the contents of the file using a non-Microsoft OS, preferably Mac OS X or Linux?
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Nov 23, 2010
How do I make a .zip file that contains every file AND every folder in the directory?
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Jul 17, 2011
how do i edit the "contents" of a pdf file. I tried pdfedit but I cant find where the content table list is stored.
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