Searching using system calls Program in C Code


Write a C program that takes a file name as a command line parameter and sorts a set of integers stored in the file (use any sorting method). You can assume that the file will always be there in the current directory and that it will always contain a set of integers(maximum no. of integers is 1000). The sorted output is written to the display and the input file is left unchanged. Compile the C file into an executable named “sort1″. Now write a C program that implements a command called “sort” that you will invoke from the shell prompt. The syntax of the command is “sort “. When you type the command, the command opens a new xterm window, and then sorts the integers stored in the file using the program “sort1″. Look up the man pages for xterm, fork and the different variations of exec* calls (such as execv, execve, execlp etc.) to do this assignment.

#include<stdio.h>

int main(int argc, char *argv[])
{

FILE *fp1;
int A[1000],T[1000];
int j,i=0;

/* check that we have a file name specified as a command-line argument */
if (argc<2)
{
printf(“\nPlease enter filename as argument when running this program.\n”);
printf(“For example: listprog file.txt\n\n”);
return -1;
}

fp1= fopen(argv[1], “r”);
if (!fp1)
{
printf(“\nUnable to open file: %s; exiting.\n\n”, argv[1]);
return -2;
}

for(j=0;(j<1000)&&(feof(fp1)== 0);j++)
{
if(feof(fp1)== 0)
{
fscanf(fp1,”%d”,&A[j]);
i++;
}
else
printf(“\nError”);
}

sort(A,i);
display(A,i);
fclose(fp1);

return 0;
}

display(int A[],int n)
{
int i;
for(i=0;i<n;i++)
printf(“\n%d”,A[i]);

}

sort(int a[],int n)
{
int i,j,t;
for(i=n-2;i>=0;i–)
{
for(j=0;j<=i;j++)

{
if(a[j]>a[j+1])
{
t=a[j];
a[j]=a[j+1];
a[j+1]=t;
}
}

}

}

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10th 3i InfoTech Academic Books Accenture ACIO ActiveX ADT Agricultural AIEEE Air Force Algebraic Amdocs Android Answers Application Development Aptitude Aptitude Questions Architectures ASP ATOS B.Sc B.Tech.B.E. Bank Exam BCA BE Board Exam Books break-continue Business Plan C C Programming C# C++ Campus campus interview Candidate profile Capgemini Career CDS Certification CET Challenge Circle Cisco class code Cognizant communication Company Company Profile Competitive Exams computer Computer Networks concentric circles constructor Course Credit Suisse CSS CTS Data Structure DBMS DC Deloitte difficult interview questions dimensions Distributed Computing do while dotNet Download ds Dynamic Web Development e-Admit card Educational engineering entertainment Even Odd Events exam schedule exception for loop fresher GATE general Discussion general knowledge Get Placed Government Job Hall Ticket HCL how to answer How to Prepare HR HR Interview HSC hypertext preprocessor IB IBM IBPS IIT Indian Army Information infosys Intelligence Bureau Internship interview Experience interview questions Interview Tips IntroC IntroC# IntroJava IntroPHP IT J2EE J2ME Java JavaScript jobs Language Books Language Tutorial Languages limit number of objectsJava Limit the number of objects being created in JAVA Linux Linux Administrator Linux Developer Logical Questions loops M Tech M.E. M.Tech M.Tech AND B.Tech Management Management Skills Matrices MBA mca ME microsoft mistakes Mixture Mobile Computing mock questions mock test MySql naukri NDA OOP opening Operating System Oracle paper Persistent PHP php programming php string variables PL/SQL Placement placement guide Placement Paper Placement Process preparing for placement presentation probability Problems Professional program Programming Project Engineer project idea Projects Puzzle qualities Question of the day Questions Quiz Question Recruitment Recruitment Pattern Requirement Result Resume Reviews Screen Sizes Scripting Session Skills Software Software Engineering solved papers Source Code Speed time and distance SQL SSC story Stress Interview Study Material study tips submit resume Synonym TCS Tech Mahindra tech news Technical Books Technical Interview Testing thank you letter Thought Time Table TutC++ Unix questions asked in aptitude and inteviews for MCA UPSC verbal Web Designing Web Developer Website Development What to read while loop Wipro Writing Resume