//grep
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main(int argc,char*argv[])
{
FILE*fs=fopen(argv[2],"r");
if(fs==NULL)
return 0;
char ch;
int count=0,biglinelenth=0;
while((ch=fgetc(fs))!=EOF)
{
count++;
if(ch=='\n')
{
if(count>biglinelenth)
biglinelenth=count;
count=0;
}
}
char*s=(char*)malloc(biglinelenth*sizeof(char));
while(fgets(s,biglinelenth,fs)!=NULL)
{
if(strstr(s,argv[1])!=NULL)
printf("%s",s);
}
}
//filesize,bigline,biglinelenth,lines
#include<stdio.h>
#include<string.h>
int main(int argc,char*argv[])
{
FILE*fs=fopen(argv[1],"r");
if(fs==NULL)
return 0;
char ch;
int count=0,biglinelenth=0,line=0,filesize=0,bigline;
while((ch=fgetc(fs))!=EOF)
{
count++;
filesize++;
if(ch=='\n')
{
line++;
if(count>biglinelenth)
{ biglinelenth=count;
bigline=line;
}
count=0;
}
}
printf("filesize:%d lines: %d bigline: %d biglinelenth: %d",filesize,line,bigline,biglinelenth);
//wc command
#include<stdio.h>
#include<string.h>
int main(int argc,char*argv[])
{
FILE*fs=fopen(argv[1],"r");
if(fs==NULL)
return 0;
char ch;
int line=0,filesize=0,word=0;
while((ch=fgetc(fs))!=EOF)
{
filesize++;
if(ch=='\n')
line++;
if((ch==' ')||(ch=='\n'))
word++;
}
printf("lines: %d words: %d filesize:%d filename:%s",line,word,filesize,argv[1]);
