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‎CAT

16.7 KB
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‎CAT.c

Lines changed: 90 additions & 0 deletions
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void read_from_stdin(int* count,int flagLineNumber,int flagMarkEnd)
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{
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char buf[1000];
8+
while(1)
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{
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if(fgets(buf,sizeof(buf),stdin)==NULL)
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{
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printf("Error Occured");
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return;
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}
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++(*count);
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if(flagLineNumber==1)
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printf("%5d ",*count);
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int i=0;
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while(buf[i]!='\n')
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{
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printf("%c",buf[i]);
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++i;
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}
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if(flagMarkEnd==1)
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printf("$");
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printf("\n");
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}
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}
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void read_from_file(FILE* file,int* count,int flagLineNumber,int flagMarkEnd)
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{
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char line[1000];
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while(fgets(line,sizeof(line),file))
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{
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++(*count);
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if(flagLineNumber==1)
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printf("%5d ",*count);
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int i=0;
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while(line[i]!='\n')
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{
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printf("%c",line[i]);
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++i;
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}
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if(flagMarkEnd==1)
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printf("$");
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printf("\n");
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}
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}
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void print_file(char stream[1000],int* count,int flagLineNumber,int flagMarkEnd)
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{
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if(strcmp(stream,"-")==0)
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read_from_stdin(count,flagLineNumber,flagMarkEnd);
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else
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{
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FILE *file=fopen(stream,"r");
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if(file==NULL)
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printf("cat: '%s': No such file or directory\n",
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stream);
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else
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{
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read_from_file(file,count,flagLineNumber,flagMarkEnd);
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fclose(file);
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}
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}
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}
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int main(int argc,char *argv[])
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{
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int count=0;
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int flagLineNumber=0;
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int flagMarkEnd=0;
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if(argc==1)
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read_from_stdin(&count,flagLineNumber,flagMarkEnd);
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int i=1;
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if(strcmp(argv[1],"-n")==0)
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{
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flagLineNumber=1;
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++i;
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}
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else if(strcmp(argv[1],"-E")==0)
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{
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flagMarkEnd=1;
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++i;
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}
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for(;i<argc;++i)
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print_file(argv[i],&count,flagLineNumber,flagMarkEnd);
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return 0;
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}

‎DATE

16.5 KB
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‎DATE.c

Lines changed: 36 additions & 0 deletions
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1+
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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int main(int argc,char *argv[])
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{
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time_t t=time(NULL);
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struct tm *timeInfo;
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char printableTime[100];
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if(argc==1)
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{
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timeInfo=localtime(&t);
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strftime(printableTime,sizeof(printableTime),"%A %d %B %Y %l:%M:%S %p %Z",timeInfo);
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printf("%s\n",printableTime);
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}
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else if(argc>2)
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printf("Excess arguments recived\n");
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else if(strcmp(argv[1],"-u")==0)
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{
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timeInfo=gmtime(&t);
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strftime(printableTime,sizeof(printableTime),"%A %d %B %Y %l:%M:%S %p %Z",timeInfo);
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printf("%s\n",printableTime);
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}
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else if(strcmp(argv[1],"-R")==0)
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{
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timeInfo=localtime(&t);
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strftime(printableTime,sizeof(printableTime),"%a, %d %b %Y %H:%M:%S %z",timeInfo);
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printf("%s\n",printableTime);
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}
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else
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printf("Invalid argument recieved\n");
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return 0;
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}

‎LS

16.7 KB
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‎LS.c

Lines changed: 44 additions & 0 deletions
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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void print_sorted_directory()
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{
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struct dirent **files;
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int n=scandir(".",&files,NULL,alphasort);
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for(int i=0;i<n;++i)
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{
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if(strcmp(files[i]->d_name,".")!=0 && strcmp(files[i]->d_name,"..")!=0)
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printf("%s \n",files[i]->d_name);
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free(files[i]);
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}
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free(files);
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}
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void print_all_sorted_directory()
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{
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struct dirent **files;
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int n=scandir(".",&files,NULL,alphasort);
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for(int i=0;i<n;++i)
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{
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printf("%s \n",files[i]->d_name);
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free(files[i]);
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}
27+
free(files);
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}
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int main(int argc,char *argv[])
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{
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if(argc==1)
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print_sorted_directory();
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else if(argc>2)
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printf("Excess arguments");
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else if(strcmp(argv[1],"-A")==0)
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print_sorted_directory();
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else if(strcmp(argv[1],"-a")==0)
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print_all_sorted_directory();
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else
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printf("Unrecognised flag\n");
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43+
return 0;
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}

‎MKDIR

16.7 KB
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‎MKDIR.c

Lines changed: 87 additions & 0 deletions
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <sys/stat.h>
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int isPresent(char name[])
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{
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struct dirent **files;
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int n=scandir(".",&files,NULL,alphasort);
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int flag=0;
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for(int i=0;i<n;++i)
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{
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if(strcmp(name,files[i]->d_name)==0)
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if(files[i]->d_type==DT_DIR)
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flag=1;
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free(files[i]);
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}
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free(files);
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return flag;
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}
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void print_help()
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{
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printf(" Functions Manual\n");
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printf("\n");
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printf("NAME\n");
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printf(" mkdir\n");
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printf("\n");
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printf("SYNOPSIS\n");
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printf(" mkdir [OPTION] fileName\n");
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printf("DESCRIPTION\n");
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printf(" makes a directory.\n");
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printf("\n");
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printf("OPTION\n");
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printf(" mkdir fileName\n");
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printf(" makes a directory with name fileName\n");
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printf(" mkdir -v fileName\n");
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printf(" makes a directory and tell the status after creation\n");
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printf(" mkdir --help\n");
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printf(" display this help\n");
43+
44+
45+
}
46+
47+
int main(int argc,char *argv[])
48+
{
49+
if(argc==1)
50+
printf("Insufficient arguments recieved");
51+
else if(argc==2 && strcmp(argv[1],"--help")==0)
52+
print_help();
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else
54+
{
55+
int i=1;
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int flagExplain=0;
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if(strcmp(argv[1],"-v")==0)
58+
{
59+
flagExplain=1;
60+
++i;
61+
}
62+
if(flagExplain==1 && argc==2)
63+
printf("Insufficient arguments recieved");
64+
else
65+
{
66+
for(;i<argc;++i)
67+
{
68+
if(isPresent(argv[i]))
69+
printf("%s is a already present, can't create another\n",argv[i]);
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else
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{
72+
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int m=mkdir(argv[i],077);
74+
if(!m)
75+
{}
76+
else
77+
printf("%s could not be created\n",argv[i]);
78+
if(flagExplain==1)
79+
printf("%s is created\n",argv[i]);
80+
}
81+
}
82+
}
83+
}
84+
85+
86+
return 0;
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}

‎Makefile

Lines changed: 28 additions & 0 deletions
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shell: shell.o
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gcc shell.o -o shell
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shell.o: shell.s
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gcc -c shell.s
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shell.s: shell.i
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gcc -S shell.i
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shell.i: shell.c
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gcc -E shell.c -o shell.i
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run: shell
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./shell
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all: LS.c CAT.c DATE.c RM.c MKDIR.c
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gcc LS.c -o LS
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gcc CAT.c -o CAT
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gcc DATE.c -o DATE
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gcc RM.c -o RM
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gcc MKDIR.c -o MKDIR
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clean:
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cp shell.c temp.c
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rm shell*
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cp temp.c shell.c
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rm temp.c

‎RM

16.6 KB
Binary file not shown.

‎RM.c

Lines changed: 70 additions & 0 deletions
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1+
#include <stdio.h>
2+
#include <stdlib.h>
3+
#include <string.h>
4+
#include <dirent.h>
5+
6+
int isFolder(char name[])
7+
{
8+
struct dirent **files;
9+
int n=scandir(".",&files,NULL,alphasort);
10+
int flag=0;
11+
for(int i=0;i<n;++i)
12+
{
13+
if(strcmp(name,files[i]->d_name)==0)
14+
if(files[i]->d_type==DT_DIR)
15+
flag=1;
16+
free(files[i]);
17+
}
18+
free(files);
19+
return flag;
20+
}
21+
22+
int main(int argc,char *argv[])
23+
{
24+
if(argc==1)
25+
printf("Insufficient arguments recieved");
26+
else
27+
{
28+
int i=1;
29+
int flagPrompt=0;
30+
int flagExplain=0;
31+
if(strcmp(argv[1],"-i")==0)
32+
{
33+
flagPrompt=1;
34+
++i;
35+
}
36+
else if(strcmp(argv[1],"-v")==0)
37+
{
38+
flagExplain=1;
39+
++i;
40+
}
41+
if((flagPrompt==1 || flagExplain==1) && argc==2)
42+
printf("Insufficient arguments recieved");
43+
else
44+
{
45+
char c='Y';
46+
for(;i<argc;++i)
47+
{
48+
if(isFolder(argv[i]))
49+
printf("%s is a directory, can't delete\n",argv[i]);
50+
else
51+
{
52+
if(flagPrompt==1)
53+
{
54+
printf("Do you want to remove %s[Y/N]\n",argv[i]);
55+
scanf(" %c",&c);
56+
if(c=='N')
57+
continue;
58+
}
59+
int r=remove(argv[i]);
60+
if(r==-1)
61+
printf("%s could not be removed\n",argv[i]);
62+
if(flagExplain==1)
63+
printf("%s is removed\n",argv[i]);
64+
}
65+
}
66+
}
67+
}
68+
69+
return 0;
70+
}

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