Question

Implement a Linux application (C program) that shows a file listing of a directory in the terminal. In the list include the file name, size, and date modified. This would mimic what you see in a standard file explorer/ftp. Allow for 2 optional flags:

-n: will sort the given directories files by size

-m: will sort the given directories files by last modified

Notes:

• The -n and -m flags are optional, allow for one or both to be used, or neither
• The directory is optional, the use the working directory by default
• The date modified must be formatted, not the bit/number representation
• This program should only execute once (no loops)
• If the directory is entered and its invalid, include an error message and exit the application
• Exec syntax example: ./ex1 [directory][-n][-m]

Answer 1

prog.c:

#include <stdio.h>
#include <string.h>
void main()
{
char a[100];
printf("enter the tag -n to sort directory's files by size\n");
printf("enter the tag -m to sort directory's files by last modified\n");
scanf("%s",a);
if(strcmp(a,"-n")==0)
system("/bin/ls -ls -S| awk '{print $7" ",$8" ",$9"    ",$6"   ",$10"   "}'");
else if(strcmp(a,"-m")==0)
system("/bin/ls -ls -lt| awk '{print $7" ",$8" ",$9"    ",$6"   ",$10"   "}'");
else
system("/bin/ls -ls| awk '{print $7" ",$8" ",$9"    ",$6"   ",$10"   "}'");
}

Output: