UNIX cat like utility - Beginners / Lab Assignments Source Code in C

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Home » C Home » Beginners / Lab Assignments Home » UNIX cat like utility

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Title	UNIX cat like utility
Author	Sourav Datta
Author Email	soura_jagat [at] yahoo.com
Description	This is a UNIX cat command like utility that can print any number of files in the command prompt by using the syntax cat ... and it can create file and write to it using the command cat -w .
Category	C » Beginners / Lab Assignments
Hits	366092
Code	Select and Copy the Code
#include<stdio.h> #include<string.h> #include<conio.h> int main(int argc,char* argv[]){ FILE* fp; int i=0; char c; if(argc==1){ fprintf(stderr,"Error using cat... "); exit(2); } if(!strcmp(argv[1],"-w")){ /* This returns 1 if match is found */ if(argc!=3){ fprintf(stderr,"Invalid no. of arguments "); exit(2); } fp=fopen(argv[2],"w"); if(fp==NULL) { fprintf(stderr,"Error in opening file... "); exit(2); } c=getchar(); while(c!=EOF) { fputc(c,fp); c=getchar(); } fclose(fp); } else{ for(--argc;argc>0;argc--){ fp=fopen(argv[++i],"r"); if(fp==NULL){ fprintf(stderr,"File not found...Aborting "); exit(2); } while((c=fgetc(fp))!=EOF) fputc(c,stdout); fclose(fp); } } }

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