I am using NetBSD-5.1.1. I wanted to know what happens internally when we create a file in linux. ( In general )?The header file STDIO.H present in "src/include/stdio.h" contains a "FILE" structure with various members like _p, _cookie, etc.2. I wanted to know how does internally memory gets allocated for them.?
View 1 RepliesI am using NetBSD-5.1. 1. I wanted to know what happens internally when we create a file in linux. ?The header file STDIO.H present in "src/include/stdio.h" contains a "FILE" structure with various members like _p, _cookie, etc. 2. wanted to know how does internally memory gets allocated for them.
View 1 Replies View RelatedWhat I plan to do is, create a duplicate file of a text file, and then append some text into the new text file.
View 1 Replies View Relatedone tell me the internal working of kill command. that is how it kills a process internally or from where it picks file to continue its process.
View 3 Replies View Relatedcan any body tell me how to creat a log file in linux...when i run the script the details must go to log file...
View 8 Replies View RelatedI am using RHEL 5.0 and I have some trouble with a CSV file.
What I need to do is to grab all the elements from the 3rd column and place them each on a new line in a different (new) file.
For example, if the CSV file is code...
I tried to threat each line as a string and grab the 3rd element, but for some reason it fail.
I have a file with 5000 lines. it is a list of books authors, series and titles. all lines start with the author names, than there is a dash (-) than the series name, a dash again and the title of the book.
The problem I encounter is that sometime there is a series, sometime not, and as I try to enter this list in a database, I wanted to create a cvs file to import into mysql.
ex:
The best would be to be able to add in the second line, a "space dash space" just after the author name, but how to make sure it does not do it to the first line as well.
If I could separate all line with 2 dash, (grep ?) then I would be able to do a simple replace, and change the single dash into two.
I having the following awk line in a script, is it possible to modify the script so that it create a the directory if it dosnt exist (similar to mkdir -p) awk -v datum="$DATUM" -v workingdir="$workingdir" '{ sub("\[.*","",$5); print > workingdir"/"datum "/" $5;}' $1
View 1 Replies View Relatedis there a way to save/create a file with fopen so the file is in the user home directory.Normally I'd do fopen("/home/me/myfile.... but me might change from one user to another. So can I so some sort of switch so it saves to whoever is using.
View 5 Replies View RelatedLets start with useful information:I need to create a hidden file for windows/linux using my c++ program.The file will be created on a mp3 player (fat32 file system) and the name will be ".myFile", so the file will appear hidden onux system (period before the name).The problem:Using windows I'm able to see this file, cause the "hidden" attribute is not set.
On Windows API there's a function to do that (CreateFile), then I was trying to find a compatible function to set the hidden attribute, but there's no success until now.Could someone show me the way? There's a program to change these attributes: mattribI will try (again) to find the source code, if someone knows where could I find it
I am using GTK and C and on my application I have a Drag and drop feature.
Code: Select allicon_view = gtk_icon_view_new_with_model(create_and_fill_model(pALP));
g_object_unref(pALP->list_store); /* destroy model automatically with view */
gtk_icon_view_set_selection_mode(GTK_ICON_VIEW(icon_view), GTK_SELECTION_SINGLE);
gtk_icon_view_set_reorderable(GTK_ICON_VIEW(icon_view), TRUE);
gtk_icon_view_set_text_column(GTK_ICON_VIEW(icon_view), COL_DISPLAY_NAME);
[Code] ....
The drag and drop works fine but when I exit the application and enter again, the changes of the drops are not saved, meaning the new location is not saved. I understand that in order to save the location of the drops I need to create a menu file and write some xml, But how do I do this? it there another way?
I've written an Expect script that assists with change management on Cisco devices. The script creates log files for pre-change, the change itself, and post-change. Each log and its commands is triggered by a ! command. For example:
Code:
./dochange.exp hostname
<script spawns bash, user SSHes to hostname>
!PRE
[code]....
All of this works fine. My big hair-pulling hiccup is that the resulting log files are filled with raw backspace characters! I am using log_file to log the output from the script. I stop and restart logging with a new file when needed. However, the log files are pretty much unusable. After doing some research, it looks like log_file sends output to the file in real-time, unbuffered. When I hit a key, it's immediately sent to the log. What I would like is for only the resulting string to go to the log. If I start to type 'reload' and instead type 'show run', I don't want 'reload' to be listed in the log at all.
i am trying to generate a linux executable data (bin data) from my java source code.
View 4 Replies View RelatedI need a script that can do this: A script that searches all directories and subdirectories for .html files When a .html file is found it creates a index.html file in that folder. It then edits the index.html file and inserts links to all of the .html files that are in that folder into the body. If no .html files are found, it searches for folders. It then creates a index.html file with links to all of the folders.
View 4 Replies View RelatedI am using C. I have a fuction that returns a string
Code:
I need to format this string so that I can create a text file like so:
So I'm trying:
Code:
But I get errors like:
I'm running Apache on Centos 5.5, with active SELinux, and I'm having trouble getting my Perl script to write a file that doesn't yet exist to a folder which has the proper security context.
View 9 Replies View RelatedI am working on a script to convert a comma seperated text file into html code line by line. The text file is like so:
Code:
link url, image url, description and I want it to output this:
Code:
<td><a href=�link url�><img src="image url" alt=�description" /></a></td>
Here is what I have so far:
Code:
#!/bin/bash
var1='<td><a href=
var2='><img src="'
var3='" alt=�thumbnail image" /></a></td>'
[code].....
It puts the entire line into the html so its no good. I'll probably need to use awk (I think).
My question deals with me creating a name pipe (file) in the my /group directory called chat.I then have to write a script to read from the named pipe and save data into a file called chat.log until the words End of File are passed to the program.
-When I created the named pipe file (chat) I used the mknod chat p command..Is this the correct command to create a named pipe file? -Then I'm having trouble with my script and how to make it run until the words End of File are entered in. This is what I have so far.
I've found myself in the situation where I need to create a menu in gnome/kde for a directory structure full of documents.The directory structure looks like this:
Code:
DOCS/
.. REFERENCES/
[code]...
I 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?
I am trying to create a regular expression in perl to remove all the delimiters (|) from a file. I was also thinking might I be able to use tr?
View 11 Replies View RelatedI'm starting bash shell script and I'm looping without any solution.
I'm trying to find some files under a folder hierarchy and in case of errors moving these files to a destination folder under the same hierarchy recreating this hierarchy if not exists.
Finding all ._* files under /src and moving them to /dest recreating folder1 or the others which contains ._* files but without moving files which does not correspond to the pattern.
Code:
I tried find command and I'am getting all needed files
Code:
But I don't know how to use the output to get the parent folder of files which are found to
1- create folder with mkdir -p /dest/folder1 or /dest/folder1/folder4
2- move found files from /src/... to /dest/... with rm command
I'm working on a find command as this trying to do all in the same line but ... little lost
Code:
It's more just straight networking rather than Linux related - possibly a rather large gap in my knowledge.Been asked to set up a Linux firewall / router for a friend, and he wants an external address on his PC and his firewall. He's got a /30... ISP seem to think this is normal. My understanding was different router interfaces should be in different subnets when it comes to addressing. eg:
WAN 1.1.1.1LAN 192.168.1.1/24 (then PC 192.168.1.2)This is how I'd set up an enterprise router, and from memory how I had to regurgitate networking for my Cisco exams. But they would have been large devices within a BGP environment, how does this compare to home use? Can you have interfaces on the same router within in the same subnet? I'm looking for the real world answer - not my CCNA answer or the config addressing scheme I just blindly followed...Is this right or can different interfaces be in the same subnet?If they can be in different subnets How would you do that with an eternal 1.1.1.1/30? egWAN 1.1.1.1LAN (what IP?) then PC 1.1.1.2Would you actually just set the router up as a /29 and then use the additional IP addresses for the LAN NIC on the router? (yes I'm aware you couldn't route to where it had actually been allocated)
Then with that how do I route the 1.1.1.1/30? Which interface do I point it at? Even with a /29 I'd still have a routing issue right?Or are the ISP expecting you to do something with NAT / port forwarding. (and yes I could do this to get it working - but I want to understand it better) I'm asking the question here, because rather than just wanting a magic file to get things working, I'd actually rather understand the principles rather than just press a button and have it work.
I have a project due for my Intro to C++ class and we are suppose to generate a file listing that will take an input of a C++ source code with .cpp extension and make a copy of it with a .lst extention that will have a line number preceding each and every line.
View 12 Replies View RelatedI am not sure if this is a problem with my router or a problem with the fedora 12 server i am using.
- internal here means within my home network, external means from outside it.
I can access my server and webpage:
internally using http://192.168.0.192
externally using http://MYDNS___EXAMPLE.com
but I cannot access the server internally using http://MYDNS___EXAMPLE.com
This is a pain in the butt because I have all of my client software setup with an internal and external access point (ssh, proFTPd, http, MS Access database connected to MySql, etc.)
I have a 500GB WesternDigital Elements external harddrive and recently I plugged it into my computer and noticed the green light on the power adapter didn't light up anymore. I'm assuming that the power adapter failed - is this a fairly safe assumption? I know it COULD be something else, but does this at least make sense to move forward?Coincidentally, I've been researching new externals to order a 1.5TB because the 500GB is full.
I'm contemplating two options:
1.) Replace the power supply for ~$40
2.) Take apart the external and mount it internally
If it is in fact the power supply it might be the best option to just replace the thing and have 2 externals for backing up data on. But if it turns out to not be the power supply I'm out $40.I'm not sure how taking apart the external and install the hard drive in a desktop computer would be. Is the harddrive a standard drive? Does it have all the same power cords a normal computer would? If so, I could just install it into my brother's desktop and retreive the data that way (and he'll have an extra 500GB hdd).
I am creating podcasts that I like to download to my android phone. I host the podcasts on my home webserver and use dyndns for the website when outside the network. However, when I type in my dyndns website from inside my network, it will not work.
I realize i can use the ip address to get to the site, but since I use beyondpod for my podcasts, it's all saved in settings. So what i'd like to be able to do is download the podcasts to my phone from either inside or outside the network.
So I keep reading that bonding ethernet devices is supposed to be easy. I have followed several tutorials and tried a few things on my own, and I can't seem to get it right. I currently have a setup that allows me to ping internally on my network, but when I try to ping externally I get the error:
connect: Network is unreachable
Before I bonded the interface my connection worked fine. Here are my config files. I am running centos 5.3 on a virtual machine.
/etc/sysconfig/network-scripts/ifcfg-bond0
Code:
DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
NETWORK=192.168.1.0
NETMASK=255.255.255.0
IPADDR=192.168.1.211
USERCTL=no
/etc/sysconfig/network-scripts/ifcfg-eth1
Code:
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
HWADDR=00:0c:29:88:59:47
MASTER=bond0
SLAVE=yes
USERCTL=no
/etc/sysconfig/network-scripts/ifcfg-eth0
Code:
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
HWADDR=00:0c:29:88:59:3d
ONBOOT=yes
/etc/modprobe.conf
Code:
alias eth0 pcnet32
alias scsi_hostadapter mptbase
alias scsi_hostadapter1 mptspi
alias scsi_hostadapter2 ata_piix
alias eth1 pcnet32
alias bond0 bonding
options bond0 mode=0 miimon=100
output of cat /proc/
Code:
Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0
Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:0c:29:88:59:3d
Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:0c:29:88:59:47
I have configured a sendmail MTA for incoming mails in a network and by using IPtables i have redirected the traffic internally to other port where one more SMTP by a application is running.Iptables rule:
iptables -A INPUT -i eth0 -p tcp --dport 25 -j ACCEPT
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 25 -j REDIRECT --to-port 25000
My sendmail config is as below.
Sendmail.mc
define(`SMART_HOST', `relay:host.subdomain.mydomain.com')dnl
dnl # define(`RELAY_MAILER',`esmtp')dnl
[code]...
I know that you can access and run any script of the web by wget:
Code:
wget mydomain.com/page.php
But this is literally accessing it externally through the web, i think that it is safer and faster to access the script internally. I am using lighttpd to host my php pages, and is there a way to do that? I have had some hosting experiences, the cronjobs on the hosts let u input:
Code:
* * * * * php /public_html/path/page.php