En bash:
$ for i in *; do echo $i; done
Fuente: nfosolutions.com
En C:
/*
*
* Esempio che scansiona una cartella stampando a video i file in essa
* contenuti.
*/
#include
#include
#include
#include
int main(int argc, char *argv[])
{
DIR *dir;
struct dirent *drent;
if(argc < 2)
{
fprintf(stderr, "%s \n", argv[0]);
return EXIT_FAILURE;
}
if((dir = opendir(argv[1])) == NULL)
{
fprintf(stderr, "Errore opendir()\n");
return EXIT_FAILURE;
}
while((drent = readdir(dir)) != NULL)
{
fprintf(stdout, "--> %s\n", drent->d_name);
}
if(closedir(dir) < 0)
{
fprintf(stderr, "Errore closedir()\n");
return EXIT_FAILURE;
}
}
En Python:
import os
def ls(d):
if os.path.isdir(d):
for f in os.listdir(d):
print "%s%s" % (f, "/" if os.path.isdir(f) else "")
En Python utilizando un generador que devuelve un resultado cada vez:
import subprocess
def listdirx(dirname='.', cmd='ls'):
proc = subprocess.Popen([cmd, dirname], stdout=subprocess.PIPE)
filename = proc.stdout.readline()
while filename != '':
yield filename.rstrip('\n')
filename = proc.stdout.readline()
proc.communicate()
Una alternativa a listdir usando ctypes y opendir, readdir:
#!/usr/bin/python
"""
An equivalent os.listdir but as a generator using ctypes
"""
from ctypes import CDLL, c_char_p, c_int, c_long, c_ushort, c_byte, c_char, Structure, POINTER
from ctypes.util import find_library
class c_dir(Structure):
"""Opaque type for directory entries, corresponds to struct DIR"""
pass
class c_dirent(Structure):
"""Directory entry"""
# FIXME not sure these are the exactly correct types!
_fields_ = (
('d_ino', c_long), # inode number
('d_off', c_long), # offset to the next dirent
('d_reclen', c_ushort), # length of this record
('d_type', c_byte), # type of file; not supported by all file system types
('d_name', c_char * 4096) # filename
)
c_dirent_p = POINTER(c_dirent)
c_lib = CDLL(find_library("c"))
opendir = c_lib.opendir
opendir.argtypes = [c_char_p]
opendir.restype = c_dir_p
# FIXME Should probably use readdir_r here
readdir = c_lib.readdir
readdir.argtypes = [c_dir_p]
readdir.restype = c_dirent_p
closedir = c_lib.closedir
closedir.argtypes = [c_dir_p]
closedir.restype = c_int
def listdir(path):
"""
A generator to return the names of files in the directory passed in
"""
dir_p = opendir(".")
try:
while True:
p = readdir(dir_p)
if not p:
break
name = p.contents.d_name
if name not in (".", ".."):
yield name
finally:
closedir(dir_p)
if __name__ == "__main__":
for name in listdir("."):
print name