Programming :: Parse Files With Variable Record Length?
Aug 6, 2010
I would like to extract Room number, Lastname,Firstname,invoice (205880080),arrival date, departure date, and total(229.46). Can you at least give me a hint on how to proceed? I have tried a lot but I am stumped from the beginning.
***History***
Room: 124 B Payment: Bell/TRAVELSCAPE.COM
Lastname*FIT*,Firstname 4A, 0K, 0B Guest
Bell *205880080 FT
Bell *205880080 July 31, 2010
[Code]...
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Jan 7, 2011
The declaration for directory record length in ext2 filesystem is as follows:
Code:
#define EXT2_NAME_LEN 255
struct ext2_dir_entry_2 {
__u32 inode; /* Inode number */
__u16 rec_len; /* Directory entry length */
__u8 name_len; /* Name length */
__u8 file_type;
char name[EXT2_NAME_LEN]; /* File name */
};
Some say because the record is not in a fixed length so rec_len is the real record length. Why is the length of the array `name' not fixed? I thought C arrays like this should be fixed length. C99 has variable-length arrays, does this structure count on C99?
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Feb 12, 2011
Does anyoe have any example c/c++ code that is used to parse type-length-value messages.
The only decent article I can find on the web is:
http://en.wikipedia.org/wiki/Type-length-value
Bur it does not give any examples of parsing etc..
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Jul 13, 2010
I am trying to think of a logic where my file contains some data I had to read and do some processing. Issue is that file contains data multiple times. For example:
:::::::::::
var1=value1
var2=value2
[code].....
I have to read first paragraph of variables and do some processing and then move on until the end of file. Variable names are same in whole file but for each paragraph the value is different. I can't think of a logic to attain this task. How can I do it? It should be a simple bash script, but I am not able to work out.
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Sep 2, 2010
Kindly take a look at the code below :
Code:
#include <stdio.h>
struct test
{
int i;
int j;
[Code]....
why i am getting this error. I know the error is occuring because i have assigned values to obj.i and obj.j outside main(). But i want to know why do that result in an error. From my part i have created an object 'obj' of stucture 'test' and assigned values to its variables.
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Jan 27, 2011
As subjected I have this warning message code...
How can I get rid of this warning message?
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Apr 14, 2010
I have a thread started on the Slackware forum about the possibility of installing Slackware on an older P4 laptop. Well, it installed fine and most things are working, but I am experiencing one problem that I need to solve before I progress to working on other things.
I hope the mods will not consider this a double thread because it is a networking issue and the other thread was started about a different subject, and I thought there might be more networking specialists there (though everyone I meet on the Slack forum is very knowledgeable, this one has not been solved.)
I am trying to connect wireless with an RT2500 chipset, the correct module loads and the machine is connected to the network, but with a "failed" IP address (169.254.167.101). This also occurs with a wired connection. The exact error is:
Code:
err, wlan0: option 43 has zero length
failed to parse packet
It times out then assigns the failed IP address and connects to the network, but of course nothing works.
I use WPA psk and I have another laptop with the same configs and works perfectly with Slackware -current, so I followed the same routine to set this one up. When that didn't work, I backed up the existed /etc/rc.d/rc.inet1 and wpa_supplicant.conf, and copied the working files to the new setup. Same result.
There does not seem to be any information about this error either here on LQ, or on the net. I have certainly never encountered it before.
Because it connects with good signal strength, and because it also occurs with wired connections, I can only assume that it is related to WPA in some way. I have not reset the router because I have a number of other machines connected. All of the other machines work, and this one connects, so it is not hardware related.
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Jul 5, 2010
what's the difference between the following 2 methods for specifying in httpd.conf to use PHP to parse files with extension .php?
Method 1
AddType application/x-httpd-php .php
Method 2
LoadModule php5_module modules/libphp5.so
<FilesMatch .php$>
SetHandler application/x-httpd-php
</FilesMatch>
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Jan 4, 2011
what is record length of file in common terms ?
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Feb 2, 2010
I want a line or lines to check for variable length in my script. I just want to check if a variable the user inputted is 4 characters long, and if it isn't to return a false or exit status of 0.
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Jul 15, 2010
I have a question about the prompt. it is very easy to tune it for it to be colored and display path where you are etc. But my problem is that when the path is too long I would prefer the code line to be on the folowing line...
Ex
11:00 me@host a/short/path > ls -ltr ./stuff
11:00 me@host a/very/very/very/long/path
> ls -ltr ./stuff
and to be honnest as I am very new in LINUX I don't know how to do this...
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Sep 20, 2010
I'm having a hard time googling for answers because I keep using the word "keyword."
I've never really used any kind of database before, but I want to learn the basics, so I'm playing with it a little bit at work. What I want to do is make a database to hold information on various articles. For example, with columns for the title, author, and date. Those are all easy. The tricky part is that I'd also like to be able to label articles with keywords so I can search for certain topics.
Since there's no way to know ahead of time how many keywords, if any, each article might warrant, I'm not sure how to put this in database form. There's no variable-sized array data type. It seems sloppy to just list them all in a single VARCHAR column. Making several columns that may or may not be left null and putting one keyword in each seems wasteful.
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Jul 19, 2011
I'm trying to define a variable, CHAN, by dividing another variable, FREQ, by a number. FREQ is a value from a file (called header.txt). What I think I'm doing with this bit of code is reading a number from header.txt whose location is specified by the head and tails, assigning it to FREQ and then defining CHAN with bc.
Code:
#!/bin/bash
while read FREQ
[code]....
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Jan 19, 2010
I need to search a text file for a string of numbers which are different lengths, and always are between number=" and " like:
number="1234567890"
number="22390"
I need to grab those numbers and pipe each one to a line in a file. I've already tried something with awk and that didn't seem to work.
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Nov 11, 2009
I have a large file 'NS0923.csv' with data like the following. There are two records in this multi-record sample.
Code:
E60898,4578910,03/06/09,BEN BOYD RD,61,82,,,127,3,,52000.3046.001,3155,4.00,,PLT,1356,1.00,05/06/09,Y,Y,0551
,,,,,,,,,,,,4057,1.00,CLEAN CAR SHARE SIGN,LAB,0551,1.00,,,,
[code]....
2. I still have to create a file 'transaction.csv' that should retrieve data from $13 - $15 with the identifying column $1. Required output:
Code:
E60898,4057,1.00,CLEAN CAR SHARE SIGN
3. And finally another file 'quantity.csv'. Retrieving data from $16 - $18 with identifier $1. Required output:
Code:
E60898,PLT,1356,1.00
E60898,LAB,0551,1.00
E60898,LAB,3065,1.00
[code]....
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Dec 1, 2010
Im reading in file /proc/cpuinfo into a char array.Im using strstr to search for a string im interested in (the cpu speed line) and storing it in another char array.I want to just store the line that contains CPU speed but im getting everything after the CPU speed line in the char array too.Is there anything better than strstr or is there someway i can parse the the payload data (i.e. the actual cpu speed)
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Sep 11, 2015
I am having a hard time getting conky execp/execpi to correctly parse output of the scroll variable generated from shell or PHP scripts.
Code: Select allDebian 8.0
Xfce 4.10
Conky 1.9.0-6
This is a simplified minimal conky configuration file used to show the same problem:
Code: Select allalignment bottom_middle
background no
border_width 1
default_color white
default_outline_color white
default_shade_color white
double_buffer yes
[Code] ....
Here is the output I'm getting:
Code: Select all ABC /*doesn't scroll, UNEXPECTED, shows 10 spaces before ABC*/
ABC --||--
abcdefghijklmnopABC /*doesn't scroll, WORKS AS EXPECTED as scroll length is 25 which is longer than text "abcdefghijklmnop" */
abcdefghijklmnopABC --||--
abcdefghijklmnopABC /*WORKS, everything before ABC scrolls 5 characters at a time*/
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Aug 21, 2009
I'm trying to read content of file to variable and use this variable in for loop. The problem is, when I have c++ comment style in file - /*. Spaces in line are also interpreted as separated lines.
For example:
Code:
Changing $files to "$files" eliminate these problems but causes that whole content of variable is treated as one string (one execution of loop).
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Apr 7, 2010
my script has a variable which comes in the form +00.00 +0.00 -00.00 or -0.00 (the numbers can be any in that form) for any that have a + symbol I need to remove the +, but if it has a - symbol it needs to stay.
i need to make a new variable with the string from the old variable btut without any plus sign. I have tried a lot of different ways with no success, each thing I tried either left the + or removed the entire string. I think this should work but doesn't
foo=+12.40
bar=${foo#+}
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Apr 25, 2011
how I can search within a variable and assign the results to a new variable. I'll use the following as an example -
cars="Audi BMW Cadillac Chevy Dodge Ferrari Ford Mercedes"
list=`echo ${cars} | egrep -o '<A?+|<C+'`
with the echo command I get the following output assigned to list -
A
C
C
What I'd like to get for output is -
Audi
Cadillac
Chevy
how I could do this regardless of upper/lower case letters?
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Apr 28, 2010
included shell script inside c program, and i wanted to assign the value of c variable to shell variable..Can any one please suggest me how to do it?
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Apr 14, 2010
I am working on a system that uses Red Hat Client 5.3. Files keep being created all over the system. They are all named nul and are zero length. We use a common login and thy are owned by this login account. I have grep'd the entire system looking for some code that would be writing these files but nothing has come up.
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Jul 3, 2011
I would like to know how can I find array length in C .I have array of structure and I want to sent it to different functions and I want to have it's length (number of elements) each time I want to use it and I don't like to use any additional variable to pass the function for each of arrays that I pass to function.
How can I do that?
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Jun 30, 2010
I want to calculate length of my array, say Unix here.
Code:
[linux1@HMLINUX1 abc]$ declare -a Unix=('Debian' 'Red Hat' 'Suse' 'Fedora');
[linux1@HMLINUX1 abc]$
[linux1@HMLINUX1 abc]$ echo ${#Unix[@]}
5
This should be ideally 4, but somehow it is showing as 5. However, when I am removing the space as RedHat instead of Red Hat, it is working perfectly.
Code:
[linux1@HMLINUX1 abc]$ declare -a Unix=('Debian' 'Redhat' 'Suse' 'Fedora');
[linux1@HMLINUX1 abc]$ echo ${#names[@]}
4
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Mar 24, 2010
what is the best command to use to parse strings?I have a variable $str and need to parse this string.Can you provide an example of the command used to get a substring of $str based on the index values of start and end
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Feb 4, 2010
How to let awk consider a string by double quota as one field? for example:
echo "first "second is a string"" | awk '{ print $2 }'
I want to print out "second is a string".
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Jan 20, 2011
I am novice. I am trying to create one email form. But i am getting "Parse error: parse error in F:estwampwwwsendmail.php on line 43"
Code:
<?php
if(isset($_POST['email'])) {
[code]....
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Jul 28, 2010
I got this xml
...
<other stuff="etc">...</other>
<cluster id="1">
<host ipaddress="192.168.50.1" name="server1">
<host ipaddress="192.168.50.2" name="server2">
<host ipaddress="192.168.50.3" name="server3">
</cluster>
...
how would i get the ip addresses only using bash.
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Apr 17, 2011
My php knowledge is very poor (only worked with strings so far), and I am faced which a task that is a real challenge for me: I have a variable, that contains data of different type, in this order: byte, byte, string, string, string, string, short, byte, byte, byte, byte, byte, byte, byte, string.
Strings are of variable length. How could this data be parsed into variables of the right type, and then all converted to strings? What are the functions to use? Strings are unicode ones, and they are delimited by "
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Mar 17, 2011
This loop is part of a bash script which takes multiple arguments.
Code:
for ((i=1;i<=$number;++i)) ; do
offset=$(($i+5))
[code]...
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