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ls.c
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ls.c
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#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
/* Simple implementation of `ls` command; Lists all the directories provided as argument; Also shows hidden dirs */
int main(int argc, char *argv[])
{
/* Opaque DS */
DIR *dp;
/* Contains file info like name, inode & offset */
struct dirent *dirp;
/* Must contain 1 arguments */
if(argc < 1)
{
//printf("Please provide the directory to list\n");
exit(1);
}
else if(argc == 2)
{
dp = opendir(argv[1]);
}
else
{
dp = opendir(".");
}
/* opendir is used to open a directory - In unix systems both files & directories work like directories */
if(dp == NULL)
{
printf("Cannot open directory error=%s\n", strerror(errno));
exit(1);
}
/* readdir to read directory contents - dirp has the directory name stored using d_name property */
while(( dirp = readdir(dp)) != NULL)
printf("%s\n", dirp->d_name);
closedir(dp);
exit(0);
}