def rm(opts, args):
is_r = False
for opt in opts:
if opt != 'r':
inv_opt(rm.__name__, opt)
return
elif opt == 'r':
is_r = True
for arg in args:
file_path = os.path.join(os.getcwd(), arg)
if not os.path.exists(file_path):
print(rm.__name__, ": cannot remove \'", arg,
"\': No such file or directory exists")
continue
if os.path.isfile(file_path):
os.remove(file_path)
elif os.path.isdir(file_path):
try:
os.rmdir(file_path)
except:
if (is_r):
shutil.rmtree(file_path)
else:
print(rm.__name__, ': cannot remove', arg,
"Is a directory")
continue
def grep(opts, args):
if (len(opts) > 0):
inv_opt(grep.__name__, opts[0])
return
if (len(args) < 1):
print("At least 2 arguments are needed")
pattern = args[0]
for i in range(len(args) - 1):
file_path = os.path.join(os.getcwd(), args[i + 1])
if not os.path.isfile(file_path):
print(grep.__name__ + ":", args[i + 1] + ":",
"No Such file exists.")
continue
if os.path.isdir(file_path):
print(grep.__name__ + ":", args[i + 1] + ":", "Is a directory.")
continue
files = open(file_path, 'r')
lines = files.readlines()
files.close()
for line in lines:
if (len(re.findall(pattern, line))):
if (len(args) > 2):
print(args[i + 1] + ":", end=" ")
print(line[1:len(line) - 2])
return
def tail(opts, args):
if (len(opts) > 0):
inv_opt(tail.__name__, opts[0])
return
for arg in args:
file_path = os.path.join(os.getcwd(), arg)
if os.path.isdir(file_path):
print(tail.__name__ + ": error reading '" + arg +
"': Is a directory")
continue
elif not os.path.isfile(file_path):
print(tail.__name__ + ": cannot open '" + arg +
"': No such file exists")
continue
f = open(file_path, 'r')
lines = f.readlines()
f.close()
if (len(args) > 1):
print("==>", arg, "<==")
if len(lines) >= 10:
start = -10
else:
start = -1 * (len(lines))
while (start <= -1):
print(lines[start], end="")
start = start + 1
if (start == 0) and (arg != args[len(args) - 1]):
print()
def cp(opts, args):
if (len(opts) > 0):
inv_opt(cp.__name__, opts[0])
return
if (len(args) < 2):
print("Missing min. number of arguments")
return
dest_path = os.path.join(os.getcwd(), args[-1])
if (len(args) > 2 and not os.path.isdir(dest_path)):
print(cp.__name__, "target", args[-1],
"is not a directory or doesn't exist")
return
for i in range(len(args) - 1):
file_path = os.path.join(os.getcwd(), args[i])
if (not (os.path.exists(file_path)) or os.path.isdir(file_path)):
print(args[i], "doesn't exist or is a directory")
return
if (len(args) == 2):
dest_path = os.path.join(os.getcwd(), args[1])
else:
dest_path = os.path.join(os.getcwd(),
os.path.join(args[-1], args[i]))
shutil.copyfile(file_path, dest_path)
def history(opts, args):
lines_to_get = 500
if len(opts) > 0:
inv_opt(history.__name__, opts[0])
return
if len(args) == 1 and args[0] != '':
try:
lines_to_get = int(args[0])
except ValueError:
print("Invalid option, it should be interger")
return
try:
file = open('logs/history.txt', 'r')
except FileNotFoundError:
dir_operations.mkdir([], ['logs'])
file = open('logs/history.txt', 'w')
file.close()
file = open('logs/history.txt', 'r')
lines = file.readlines()
file.close()
total_lines = len(lines)
lines_to_get = min(lines_to_get, total_lines)
start_index = max(0, total_lines - lines_to_get)
for i in range(lines_to_get):
print(lines[start_index + i], end='')
return
def head(opts, args):
if (len(opts) > 0):
inv_opt(head.__name__, opts[0])
return
for arg in args:
file_path = os.path.join(os.getcwd(), arg)
if os.path.isdir(file_path):
print(head.__name__ + ": error reading '" + arg +
"': Is a directory")
continue
elif not os.path.isfile(file_path):
print(head.__name__ + ": cannot open '" + arg +
"': No such file exists")
continue
f = open(file_path, 'r')
lines = f.readlines()
f.close()
if (len(args) > 1):
print("==>", arg, "<==")
for i in range(len(lines)):
if i == 10:
if (arg != args[len(args) - 1]):
print()
break
print(lines[i][:-1])
return
def hostname(opts, args):
if len(opts) > 0:
inv_opt(hostname.__name__, opts[0])
return
if len(args) > 0 and args[0] != '':
print("Can't change hostname.")
return
print(os.system('hostname'))
def whoami(opts, args):
if len(opts) > 0:
inv_opt(whoami.__name__, opts[0])
return
if len(args) > 0 and args[0] != '':
print(whoami.__name__ + ": extra operand", args[0])
return
print(getpass.getuser())
def date(opts, args):
if len(opts) > 0:
inv_opt(date.__name__, opts[0])
return
if len(args) > 0 and args[0] != '':
print(date.__name__ + ": extra operand", args[0])
return
x = datetime.datetime.now()
print(x.strftime("%a %b %d %H:%M:%S"), time.tzname[0], x.strftime("%Y"))
def exit(opts, args):
if (len(opts) > 0):
inv_opt(exit.__name__, opts[0])
return
if (len(args) > 1 or args[0] != ''):
print(args[0] + ':', "the term is not recognized")
return
raise (KeyboardInterrupt)
def mkdir(opts, args):
if (len(opts) > 0):
inv_opt(mkdir.__name__, opts[0])
return
rnw = "str"
try:
for arg in args:
rnw = str(arg)
os.mkdir(rnw)
except FileExistsError:
print('\'', rnw, '\'', "already exists")
def cd(opts, args):
if (len(args) > 1):
print(cd.__name__, ": too many arguments")
return
if (len(opts) > 0):
inv_opt(cd.__name__, opts[0])
return
if os.path.isdir(str(args[0])):
os.chdir(str(args[0]))
else:
print(cd.__name__, ": ", args[0], ": No such file or directory")
def mv(opts, args):
if len(opts) > 0:
inv_opt(mv.__name__, opts[0])
if (len(args) != 2):
print("Arguments should be 2")
return
file_path = os.path.join(os.getcwd(), args[0])
dest_path = os.path.join(os.getcwd(), args[1])
if os.path.isdir(dest_path):
args[1] = args[1] + '/'
shutil.move(file_path, dest_path)
def rmdir(opts, args):
rnw = "str"
try:
for arg in args:
rnw = str(arg)
os.rmdir(rnw)
except OSError:
if (len(opts) == 0 or ('r' not in opts)):
print("Directory not empty")
return
for opt in opts:
if opt != 'r':
inv_opt(rmdir.__name__, opt)
return
for arg in args:
rnw = str(arg)
shutil.rmtree(rnw)
def cat(opts, args):
if len(args) == 1 and args[0] == '':
while (1):
try:
str = input()
print(str)
except:
return
if len(opts) > 0:
inv_opt(cat.__name__, opts[0])
return
else:
to_write = []
for i in range(len(args)):
if args[i][0] == '>':
to_write = to_write + [i]
if len(to_write) > 0 and to_write[-1] == len(args) - 1:
f = open(args[-1][1:], 'w')
while (1):
try:
str = input()
f.write(str)
f.write('\n')
except:
f.close()
break
elif len(to_write) > 0 and to_write[-1] != len(args) - 1:
return
elif len(to_write) == 0:
for arg in args:
try:
f = open(arg, 'r')
except FileNotFoundError:
print("No such file or directory:", arg)
return
strs = f.readlines()
for str in strs:
print(str, end="")
def sizeof(opts, args):
if (len(opts) > 0):
inv_opt(sizeof.__name__, opts[0])
return
for arg in args:
file_path = os.path.join(os.getcwd(), arg)
if (not (os.path.isfile(file_path)) or os.path.isdir(file_path)):
print(sizeof.__name__ + ":",
arg + ": is not a File or is a Directory")
continue
size = os.lstat(file_path)[6]
ext = "B"
if size > 1000:
size = size / 1000
ext = "kB"
if size > 1000:
size = size / 1000
ext = "MB"
print("Size of", arg + ": ", size, ext)
return
def find(opts, args):
if (len(opts) > 0):
inv_opt(find.__name__, opts[0])
return
files = [f for f in os.listdir() if f[0] != '.']
for arg in args:
if arg in files:
if os.path.isfile(arg):
print(arg)
queue = []
queue.append(arg)
if os.path.isdir(arg):
while (len(queue) > 0):
file_path = queue.pop()
print(file_path)
if os.path.isdir(file_path):
queue = queue + [
file_path + '/' + f for f in os.listdir(file_path)
]
else:
print(find.__name__, '\'' + arg + '\'',
': No such file or directory exists in this folder')
def ls(opts, args):
for opt in opts:
if not ((opt == 'R') or (opt == 'recursive')):
inv_opt(ls.__name__, opt)
return
for arg in args:
path = os.path.join(os.getcwd(), str(arg))
if not (os.path.isfile(path) or os.path.isdir(path)):
print("ls: cannot access \'", arg, "\': No such file or directory")
return
if ('R' in opts) or ('recursive' in opts):
queue = []
queue.append(arg)
while (len(queue) > 0):
parent = queue.pop(0)
print(('.' + parent + ":\n"))
files = [
f for f in os.listdir(os.path.join(os.getcwd(), parent))
if f[0] != '.'
]
for file in files:
if os.path.isdir(os.path.join(parent, file)):
queue.append(os.path.join(parent, file))
print(file, " ", end="")
print('\n')
else:
if (len(args) > 1):
print(arg, " :\n")
files = [
f for f in os.listdir(os.path.join(os.getcwd(), arg))
if f[0] != '.'
]
files.sort()
for file in files:
print(file, " ", end="")
print('\n')
def pwd(opts, args):
if (len(opts) > 0):
inv_opt(pwd.__name__, opts[0])
return
print(os.getcwd())
