C Program to List All Lines Containing a given String

This C Program listS all lines containing a given string.

Here is source code of the C Program to list all lines containing a given string. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C Program to List All Lines containing a given String

```
 */
```
```
#include <stdio.h>
```
```
#include <stdlib.h>
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```
#include <string.h>
```
```
 
```
```
int search(FILE *, char *);
```
```
 
```
```
void main(int argc, char * argv[])
```
```
{
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```
    FILE *fp1;
```
```
    int p;
```
```
 
```
```
    fp1 = fopen(argv[1], "r+");
```
```
    if (fp1 == NULL)
```
```
    {
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        printf("cannot open the file ");

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        exit(0);
```
```
    }
```
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    search(fp1, argv[2]);
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    fclose(fp1);
```
```
}
```
```
 
```
```
/* Searches the lines */
```
```
int search(FILE *fp, char * str)
```
```
{
```
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    FILE *fp1;
```
```
    fp1 = fopen("fp1","w");
```
```
    char s[10],c;
```
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    int len = strlen(str);
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    int i = 0;
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    int d;
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    int seek = fseek(fp, 0, 0);
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    c = fgetc(fp);
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    while (c != EOF)
```
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    {
```
```
        if (c == ' ' || c == '\n')
```
```
        {
```
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            s[i] = '\0';
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            i = 0;
```
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            if (strcmp(s, str) == 0)
```
```
            {
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                while (c = fgetc(fp) != '\n')

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                {
```
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                    fseek(fp, -2L, 1);
```
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                    d = ftell(fp);
```
```
                }
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                while ((c = fgetc(fp)) != '\n')

```
                {
```
```
                    fputc(c, fp1);
```
```
                }
```
```
            }
```
```
        }
```
```
        else
```
```
        {
```
```
            s[i] = c;
```
```
            i++;
```
```
        }
```
```
        c = fgetc(fp);
```
```
    }
```
```
    return 1;
```
```
}
```

$cat example
hi hello everyone
again hi to the late comers
welcome to the class
 
$ cc file6.c
$ ./a.out example hi
hi hello everyone
again hi to the late comers

Sanfoundry Global Education & Learning Series – 1000 C Programs.

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