I ran into it while google Segmentation Fault. I'm writing a simple C program that reads a file that counts each line and numbers it then writes to a file called sdout. I copyed my program mostly from the text book but im still having problems. Heres my code:
#include <stdio.h>
#include <stdlib.h>
void new_line(FILE *, FILE *);
int main(char *argv)
[Code]....
I have two txt files containing x and y coordinates: xcoord.txt & ycoord.txt. I need to open them; read them line by line to get each coordinate; then each time I need to update Xs and Ys parameters inside another file called "dc.in" with the grabbed values.
Finally each time I need to run two exe files ( dc_2002 and st_vac) and produce corresponding output for each Xs and Ys ( dc.in is an input file for this exe files)
I have written the following code but it does not work:
bash 3.1.17(2) I'm trying do write a shell script which must operate on each line of an ASCII text file. So, all the code must be inside a loop, and inside the loop, the first thing should be to read the next line from the file. I have the bash read command. But it reads from stdin. Any way to make read from a file?
View 6 Replies View RelatedI need a qtimer to trigger reading of a file line by line, I have the code sort of running with the timer trigger but qtimer will just read the first line over and over as it is now.
Here is the code so far:
self.lcdtimer = QTimer()
self.connect(self.pushButton85,SIGNAL("clicked()"),self.update)
self.connect(self.lcdtimer, SIGNAL("timeout()"), self.lcdxyz)
Code:
def lcdxyz(self):
import time
import os
[code]....
i want to read line by line in a files in C language actually my porblem is i have a one file cotains
if iam using fgets, it is reading each time AT only it does not moving to Ok in that file
so I have a script that creates couple of txt files. First file output is something like below..
cn=test,ou=something,ou=some,o=org
cn=testa,ou=something,ou=some,o=org
cn=testb,ou=something,ou=some,o=org
second file output is something like below..
usera
userb
userc
Quote:
userdn=`ldapsearch -x -h $server -LLL "(objectclass=person)" dn | grep dn: | cut -d" " -f2 > userdn.txt
for i in $(cat userdn.txt);do
ldapsearch -h $server -p 389 -x -D $admid -w $admpwd -s one -b "$userdn" dn | grep dn: | cut -d" " -f2 | cut -d"=" -f2 | cut -d"," -f1 > user.txt
for i $(cat user.txt);do
echo "$userdn"
done
done
when I ran both ldapsearch commands invidually, they work fine. But when I ran script, I got first file correctly but not the second one. It looks like its not reading the first file correctly and not setting the variable ($userdn) value correctly in the second ldapseach command. I want read first file first line and run the second ldapsearch and continues, then read the second line..and so on.
have been playing around with a script for a few hours and now I need to be able to output the lines in a text file one by one to be used later in the script.What it gonna do is to read a log file and grep the usernames, then write them to a file, and then run one script for each user, to search for more information about them in the log.But I don't know how to output a single line from a file, and google does not return any solution.
View 3 Replies View Relatedi am trying to read in a file 1 line at a time and for some reason it stops printing out at about line 62,000.
i am doing this:
Code:
while(fgets(c0, 1085, fstream0) != NULL)
but after about 62,0000 lines it stops printing. no seg-fault, no core dump. it just stops printing to the terminal then returns me to the command line after a couple of minutes. as a hack i am doing split -l 50000 on the input and calling my program 5 times.is there some limitation on fgets that i am not understanding ?
I'm writing a program which now accepts user input:
Code:
echo "Enter a date in the format YYYY MM DD hh mm ss."
read gregyr gregmo gregdy greghr gregmn gregsc This lets the user input a date and time, such as 2011 06 21 15 12 45, and have each number assigned to their corresponding variable. Later in the program, these variables are put into an equation, and then the terminal spits out the answer. Now I have to have the program read all of the lines from a text file, which is in this format, assign the variables.
I created the following.
x="top
middle
bottom"
I would like to make the following work.
while read line
do
echo $line
done
instead of importing a file I would like to use the variable $x I tried using pipes, but with no luck. My goal is to read one line at a time, but not have to export my data to another file, I would like to keep it all within one script.
I just learn perl script.May i know how to simplify the code below especially in the red color part? i saw some examples in internet, they use "next" command.
View 20 Replies View RelatedCode:
#!/usr/bin/perl
use 5.10.0;
use strict;
use warnings;
use Net::Ping;
[code]....
i want to read line by line in a files in C language actually my porblem is i have a one file cotains
AT
OK
if iam using fgets, it is reading each time AT only it does not moving to Ok in that file
I am trying to extract 2 numbers from a same file and my goal is to print them both in another file, on the same line, separated with a space. I have to do that for 20 files and I would like to have therefore 20 lines like this in the output file. It would look like this :
Quote:
number1_file1 number2_file1
number1_file2 number2_file2
...
...
number_1_file20 number2_file20
So far, I did only extract one number and got an output file like this :
Quote:
number1_file1
number1_file2
...
...
number1_file20
And I did this by running a bash script with the following content :
Code:
#!/bin/bash
ls execution$1$2*.* | while read filename
do
cat $filename | grep -e "Total aborts:" | cut -d " " -f3 >> abort$1$2.dat
done
$1 and $2 are just strings to identify the different files I want to consider in this loop. This script works well to extract a number which is the 3rd field of a line starting with "Total aborts:".Now, how could I change this script to do what I mentioned above (i.e. extracting two numbers from two different lines) ? The second number is the 3rd field of a line starting with "Total throughput:"
I want to access a file, and check the length of every line.After, i want to check and replace all lines with length over 10 characters, with a message.Does anyone have a clue on that?
View 1 Replies View RelatedHow can I print Linux command line history without including the line numbers? I want to send it all to a text file like this:history >> history.txt
View 1 Replies View Relatedin gcc how to read a blank line ie a string of length 0.
my code: Code:
#include<stdio.h>
#include<string.h>
#include<string>
using namespace std;
[Code]....
in gcc how to read a blank line ie a string of length 0.my code:
Code:
#include<stdio.h>
#include<string.h>
[code]...
I'm programming some skript to get statistical information about some texts. This includes calculating the mean of word lengths.Unfortunately, Umlauts count as two characters. In the example below the output is 9, it should be 6.
sincercly, Max
Code:
#!/usr/bin/perl
use POSIX;
use locale;
my $test = length("ABC���");
print $test;
am writing a small search program for my class. I have decided to use indexing for my program. Ive researched online about indexing and how search engines do it. If im gonno do that I need to create inverted files to associate files to numbers ( numbers being the index of my paths ) . Now I was wondering what would be the best way to create an inverted file ? I was going to create sql tables using mysql api in C but then again there is no array data type or vectors to store few numbers in a single column in mysql and it is not advised to use Enum or SET
View 14 Replies View RelatedI want to do this
read a files's specific line but return as argument only part of it ie
...
value # this is mass
value2 # this is force
so, how can I get / use the $value and $value2 as arguments for some other file and skip the rest of the line(s) ? of course, the values are different everytime, but the comment always the same, as well as the position of the lines in the file
I am trying to read the names of hosts from a file and do a ssh to see if processes are all running or not.
Here is the outer loop that is causing problem:
hosts.lst is a text file that has the host names in each line.
The problem is that the loop just breaks after the first run. Somehow while read line becomes invalid when the body of the loop does the ssh and returns.
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 wish to add information to one of my files based on matching IDs,
Here is an example
(the id is the 3 colunm)
(the ID is the 2 colunm)
And the output i wish to be
OUTPUT:
So as you can see the ones that do not match are still present, and the ones that do match just have the extra information from file2.txt added to them.
I thought about using join but that only seems to join the ones that match displays thoes only. i would like all the information in the output file.
Was wondering if any perl guru's could help me with a quick log file adjustment. I have a text file that looks like so (tabs and newlines are revealed so you can see what separates the data):
There are maybe 100 lines of text in this file at any given time. I need to delete all duplicate lines only looking at the first bit of text prior to the first tab. It doesn't matter which one gets deleted as long as there are no two lines that begin with that same text at the beginning before the first tab. So in this example, either the fist line "1234" or the last line "1234" would need to be deleted. I already have code in my script that opens the files - I just need the code to read the text into an array and the part that would find matches based on the above criteria, and make the deletions.
If it would be easier, I can even do a system call and use SED (v4.1.5) and/or AWK (3.1.5) instead.
Some help with this problem:Code:Write a function that counts the number of occurrences of a pair of letters in a string
View 13 Replies View RelatedIn C, I want to make a program that will take a file and replace it with a file that's nearly the same but with some minor changes. Also, I would like to point out that I'm still fairly much a beginner with C. As for an example of the file, I want to take something like this:
Code:
Random Crap
More Random Crap
Even More
Something That Changes XXXXX
[code]....
I figured the best way to go about doing this was to open the file and a blank file, read the original bit by bit and when it gets to the point that needs to be changed exchange the part that needs to be changed with what it should be changed to, delete the original file, and rename the new one to the correct name. So the first problem I've run into (and I'll probably have more) is that when I'm trying to read stuff from the original file, my program doesn't seem to be finding the original. I'm sure much of my problems will be just from not knowing how to use the C functions so bear with me. Right now I have the following:
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
[code]...
And when I try to run it I get the following:
Code:
Died Here: No such file or directory
Segmentation fault
Right now the length of 50 was just a random test length. Pretty much I was just trying to get it to read anything from the file. In the end I'm going to want it to read the entire file bit by bit, but at the moment I can't seem to get it to read anything.
I have a code over there. It reads a line from file and converts contents of it to double.
Code:
/*
* fileRead.c
[code]...
Trying to create a small script that will read user's input, test if user entered some input and if not display some message or display a text using user's input.
The script is the following but i get an error saying "[: 6: =: argument expected"
I need to edit a line in a file in gedit, but its read only. I need to change
; default-sample-rate = 44100
to
default-sample-rate=44800.
Would anyone know if there is an option to make a read only file editable? Judging by the responses to the thread I followed to enable my soundcard, it is possible, and perhaps there is some setting etc that needs changing