CS8461- OPERATING SYSTEMS LABORATORY-Write C programs to simulate UNIX commands like cp, ls, grep, etc.

Write C programs to simulate UNIX commands like cp, ls, grep, etc.
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Before seeing the program you have to learn about what is the meaning of the following commands.
cp- copy- it is used to copying contents from one file to another file.

Syntax:
cp   Source Destination
ls-list- its used to list all file names in the directory.

Syntax:
ls
grep-The grep filter searches a file for a particular pattern of characters, and displays all lines that contain that pattern.

Syntax:
grep [options] pattern [files]
Options Description
-c : This prints only a count of the lines that match a pattern
-h : Display the matched lines, but do not display the filenames.
-i : Ignores, case for matching
-l : Displays list of a filenames only.
-n : Display the matched lines and their line numbers.
Below code is included code of  both cp & ls command.


Program:

#include<stdio.h>
#include<stdlib.h>
#include<dirent.h>
#define DATA_SIZE 1000
void createf()
{  char data[DATA_SIZE];
    char n[100];
    FILE * fPtr;
    int i;
    printf("create 2 files \nfile1: with data \nfile2: without data for copying\n");
   for ( i=0;i<2;i++){ 
   printf("enter a file name:");
   gets(n);
    fPtr = fopen(n,"w");
    if(fPtr == NULL)
    {   printf("Unable to create file.\n");
        exit(EXIT_FAILURE);
    }
    printf("Enter contents to store in file : \n");
    fgets(data, DATA_SIZE, stdin);
    fputs(data, fPtr);
    fclose(fPtr);
    printf("File created and saved successfully. ?? \n");
}
}
void copyfun(){
char ch, source_file[20], target_file[20];
       FILE *source, *target;
       printf("Enter name of file to copy\n");
       gets(source_file);
       source = fopen(source_file, "r");
       if (source == NULL)
       {
          printf("Press any key to exit...\n");
          exit(EXIT_FAILURE);
       }
       printf("Enter name of target file\n");
       gets(target_file);
       target = fopen(target_file, "w");
       if (target == NULL)
       {
          fclose(source);
          printf("Press any key to exit...\n");
          exit(EXIT_FAILURE);
       }
       while ((ch = fgetc(source)) != EOF)
          fputc(ch, target);
     
       printf("File copied successfully.\n");
       fclose(source);
       fclose(target);
}
void lsandgrep(){
 char fn[10],pat[10],temp[200];
FILE *fp;
char dirname[10];
DIR*p;
struct dirent *d;
printf("Enter directory name\n");
scanf("%s",dirname);
p=opendir(dirname);
if(p==NULL)
  {
  perror("Cannot find directory");
  exit(0);
  }
while(d=readdir(p))
  printf("%s\n",d->d_name);


}

int main(){
 createf();
 copyfun();
 lsandgrep();
}

output:

 
create 2 files
file1: with data
file2: without data for copying
enter a file name:a.txt
Enter contents to store in file :
one two three
File created and saved successfully. ??
enter a file name:b.txt
Enter contents to store in file :
four
File created and saved successfully. ??
Enter name of file to copy
a.txt
Enter name of target file
b.txt
File copied successfully.
Enter directory name
PROJECT
.
..
COUNT_LINE.c
COUNT_LINE.txt
fsearch.c
fsearch.exe
LINE.c
LINE.exe
LINE.txt
tn.txt


Below code is included code of Grep command n-  pattern

Program:

 
#include <stdio.h>
#include <stdlib.h>
#include<dirent.h>
#include<conio.h>
#define DATA_SIZE 1000
#define BUFFER_SIZE 1000
void countch(){
  FILE *fptr;
    char path[100];

    char word[50];

    int wCount;



    printf("Enter file name: ");
    scanf("%s", path);


    printf("Enter word to search in file: ");
    scanf("%s", word);
    fptr = fopen(path, "r");


    if (fptr == NULL)
    {
 printf("Unable to open file.\n");
 printf("Please check you have read/write previleges.\n");

 exit(EXIT_FAILURE);
    }


    Search_in_File(fptr, word);
    printf("%d",wCount);



    fclose(fptr);

}

int Search_in_File(char *fname, char *str)
{
 FILE *fp;
 int line_num = 1;
 int find_result = 0;
 char temp[512];
  if((fopen(fname, "r")) != NULL) {
  return(-1);
 }

 while(fgets(temp, 512, fp) != NULL) {
  if((strstr(temp,str)) != NULL) {
       
   line_num=line_num+0;
   printf("\n%s\n", temp);
   find_result++;
  }
  line_num++;
 }

if(find_result == 0) {
 printf("\nSorry, couldn't find a match.\n");
 }


 if(fp) {
  fclose(fp);
 }
 return(0);
}

int main(){
 countch();
 getch();
 return 0;
}
Program:

 Below code is included code of Grep command c -  pattern

#include<stdio.h> 
#define MAX_FILE_NAME 100
#include<conio.h>

int main()
{
 FILE *fp;
 int count = 0; 
 char filename[MAX_FILE_NAME];
 char c; 

 printf("Enter file name: ");
 scanf("%s", filename);

 
 fp = fopen(filename, "r");

 if (fp == NULL)
 {
  printf("Could not open file %s", filename);
  return 0;
 }

 
 for (c = getc(fp); c != EOF; c = getc(fp))
  if (c == '\n')
   count = count + 1;

 
 fclose(fp);
 printf("The file %s has %d lines\n ", filename, count);
   getch();
 return 0;}
Enter file name: tn.txt
The file tn.txt has 4 lines
program:

Below code is included code of Grep command h-  pattern.

#include <stdio.h>
#include <stdlib.h>
#include<dirent.h>
#include<conio.h>
#define DATA_SIZE 1000
#define BUFFER_SIZE 1000
void countch(){
  FILE *fptr;
    char path[100];

    char word[50];

    int wCount;



    printf("Enter file name: ");
    scanf("%s", path);


    printf("Enter word to search in file: ");
    scanf("%s", word);
    fptr = fopen(path, "r");


    if (fptr == NULL)
    {
 printf("Unable to open file.\n");
 printf("Please check you have read/write previleges.\n");

 exit(EXIT_FAILURE);
    }


    Search_in_File(fptr,word);
    printf("%d",wCount);



    fclose(fptr);

}

int Search_in_File(char *fname, char *str)
{
 FILE *fp;
 int line_num = 1;
 int find_result = 0;
 char temp[512];
  if((fopen(fname, "r")) != NULL) {
  return(-1);
 }

 while(fgets(temp, 512, fp) != NULL) {
  if((strstr(temp,str)) != NULL) {
       
   line_num=line_num+0;
         // printf("\n%s\n", temp);
         if(temp!=str){
         printf("\n%s\n", temp);
         }
   find_result++;
  }
  line_num++;
 }

if(find_result == 0) {
 printf("\nSorry, couldn't find a match.\n");
 }


 if(fp) {
  fclose(fp);
 }
 return(0);
}

int main(){
 countch();
 getch();
 return 0;
}

program:

Below code is included code of Grep command i-  pattern.

#include <stdio.h>
#include <stdlib.h>
#include<dirent.h>
#include<conio.h>
#define DATA_SIZE 1000
#define BUFFER_SIZE 1000
void countch(){
  FILE *fptr;
    char path[100];

    char word[50];

    int wCount;



    printf("Enter file name: ");
    scanf("%s", path);


    printf("Enter word to search in file: ");
    scanf("%s", word);
    fptr = fopen(path, "r");


    if (fptr == NULL)
    {
 printf("Unable to open file.\n");
 printf("Please check you have read/write previleges.\n");

 exit(EXIT_FAILURE);
    }


    Search_in_File(fptr,tolower(word));
    printf("%d",wCount);



    fclose(fptr);

}

int Search_in_File(char *fname, char *str)
{
 FILE *fp;
 int line_num = 1;
 int find_result = 0;
 char temp[512];
  if((fopen(fname, "r")) != NULL) {
  return(-1);
 }

 while(fgets(temp, 512, fp) != NULL) {
  if((strstr(temp,str)) != NULL) {
       
   line_num=line_num+0;
   printf("\n%s\n", temp);
   find_result++;
  }
  line_num++;
 }

if(find_result == 0) {
 printf("\nSorry, couldn't find a match.\n");
 }


 if(fp) {
  fclose(fp);
 }
 return(0);
}

int main(){
 countch();
 getch();
 return 0;
}



program:

Below code is included code of Grep command l-  pattern.

#include <stdio.h>
#include <stdlib.h>
#include<dirent.h>
void l(){
char fn[10],pat[10],temp[200];
FILE *fp;
char dirname[10];
DIR*p;
struct dirent *d;
printf("Enter directory name\n");
scanf("%s",dirname);
p=opendir(dirname);
if(p==NULL)
  {
  perror("Cannot find directory");
  exit(0);
  }
while(d=readdir(p))
  printf("%s\n",d->d_name);
  }
  
  void main(){
  l();
  }

Output:

Enter directory name
PROJECT
.
..
COUNT_LINE.c
COUNT_LINE.txt
fsearch.c
fsearch.exe
LINE.c
LINE.exe
LINE.txt
tn.txt

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