C Program to Implement Grep, Egrep and Fgrep Commands

This is a C Program to implment gerp linux command. Grep is a command-line utility that searches a plain text that matches a regular expression.

Here is source code of the C Program to Implement the Program Used in grep/egrep/fgrep. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
#include<stdio.h>
```
```
#include<dirent.h>
```
```
int main() {
```
```
    char fn[10], pat[10], temp[200];
```
```
    FILE *fp;
```
```
    printf("\n Enter file name : ");
```
```
    scanf("%s", fn);
```
```
    printf("Enter the pattern: ");
```
```
    scanf("%s", pat);
```
```
    fp = fopen(fn, "r");
```
```
    while (!feof(fp)) {
```
```
        fgets(temp, sizeof(fp), fp);
```
```
        if (strcmp(temp, pat))
```
```
            printf("%s", temp);
```
```
    }
```
```
    fclose(fp);
```
```
    return 1;
```
```
}
```

Output:

$ gcc grep.c
$ ./a.out
 
Enter file name : program.c
Enter the pattern: while
 
#include<stdio.h>#include<dirent.h>int main() {    char fn[10], pat[10], temp[200];    FILE *fp;    printf("\n Enter file name : ");    scanf("%s", fn);    printf("Enter the pattern: ");    scanf("%s", pat);    fp = fopen(fn, "r");    while (!feof(fp)) {        fgets(temp, sizeof(fp), fp);        if (strcmp(temp, pat))            printf("%s", temp);    }    fclose(fp);    return 1;}}

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