Shulou(Shulou.com)06/02 Report--

Under Linux, the commands ls and dir have the same function: print the current folder directory.

Note: ls is the original command of Linux, dir is the command of the original dos, and Linux chooses to be compatible with this dos command, so dir and ls are functionally the same.

1. Ls command

Common ls commands are:

Ls # shows files and folders that are not hidden

Ls-l # shows the details of files and folders that are not hidden

Ls-a # displays all files in the current directory (including. Hidden file at the beginning)

Note: total is the size of the memory block (block) occupied by all files in the current directory, which is the sum of the values in the first column of the following figure.

2. Python implements dir-l command

For writing a program that can output dir-l using the os module, you must first understand the meaning of each field. Please refer to:

Https://baike.baidu.com/item/ls%20-l/5261110?fr=aladdin

Obviously the difficulty is how to get file permissions, file size, and file creation time.

Import os

Import time

Import stat

Import math

From pwd import getpwuid

From grp import getgrgid

FILE_PERMS = [

{'ringing: stat.S_IRUSR,' wicked: stat.S_IWUSR, 'Xerox: stat.S_IXUSR}

{'ringing: stat.S_IRGRP,' wicked: stat.S_IWGRP, 'Xerox: stat.S_IXGRP}

{'ringing: stat.S_IROTH,' wicked: stat.S_IWOTH, 'Xerox: stat.S_IXOTH}

]

Class Info:

Def _ _ init__ (self, name, size_width=0):

Self.width = size_width

Statinfo = os.stat (name)

Mode = statinfo.st_mode

Self.name = name

Fmt = "% b% d% HRV% M"

Self.date = time.strftime (fmt, time.localtime (statinfo.st_mtime))

Self.size = statinfo.st_size

Allocated_size = statinfo.st_blocks * statinfo.st_blksize

F_bsize = os.statvfs (name) .f_bsize

F_block_num = math.ceil (allocated_size / f_bsize)

Self.fsize = f_block_num * f_bsize / / 1024

Self.user = getpwuid (statinfo.st_uid) .pw_name

Self.group = getgrgid (statinfo.st_gid) .gr_name

Self.nlink = statinfo.st_nlink

Self.perm ='d'if stat.S_ISDIR (mode) else'-'

For perm in FILE_PERMS:

Self.perm + ='r'if mode & perm ['r'] else'-'

Self.perm + ='w' if mode & perm ['w'] else'-'

Self.perm + ='x' if mode & perm ['x'] else'-'

# magic method: Overrides method in object

Def _ str__ (self): http://www.0510bhyy.com/ of Wuxi artificial abortion Hospital

Return "{: {width}" .format (

Self.perm, self.nlink, self.user, self.group

Self.size, self.date, self.name, width=self.width)

If _ _ name__ = ='_ _ main__':

Total = 0

Dir_list = []

Width = 0

For x in os.listdir ('.')

If x [0] ='.':

Continue

Item = Info (x)

Width = max (width, len (str (item.size)

Total + = item.fsize

Dir_list.append (x)

Print ('total', total)

For x in sorted (dir_list, key=lambda z: z.upper ()):

Print (Info (x, width))

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