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UNIX API PROGRAM

on October 10, 2015

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UNIX API PROGRAMS

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Implementation of GREP command in C

#include<stdio.h> #include<string.h> void main(int argc , char *argv[]) { FILE *fp; char line[100]; // initialsing the file pointer to read fp = fopen(argv[2],"r"); // reading line by line and comparing each word in line while(fscanf(fp , "%[^\n]\n" , line)!=EOF) { if(strstr(line , argv[1]) !=NULL) { // print that line printf("%s\n" , line); } else { continue; } } fclose(fp); } output: cc grep.c ./a.out "word" filename

Implementation of CAT command in C program

#include<stdio.h> void main(int argc , char *argv[]) { FILE *file; char line[100]; // remember file should exist file = fopen(argv[1],"r"); printf("output of cat command\n"); // reading file line by line entering to buffer line while(fscanf(file,"%[^\n]\n",line)!=EOF) { printf("%s\n", line); } // file close fclose(file); }

Implementation of TAIL command in C

#include<stdio.h> #include<string.h> // creating stack of lines struct stack { char strings[100]; }; void main(int argc , char *argv[]) { // stucture initialisation struct stack s[100]; FILE *file; char line[100]; int n,count=0, i=0; file = fopen(argv[1] , "r"); // reading line by line and push to stack while(fscanf(file , "%[^\n]\n" , line)!=EOF) { strcpy(s[i].strings , line); i++; n=i; } // pop line by line for(i=n;i>0;i--) { // last 10 lines if(count == 10) break; else pri

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UNIX API PROGRAM

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