Shell basic command ls, shell basic ls

Shell basic command ls, shell basic ls

Shell basic command ls

1 Command Format

Ls [Option] [command name]

2. command functions

List all subdirectories and files in the target directory

3. Common Parameters

-A,-all: list all directories and files in the directory, including hidden files starting.

-A is the same as-a, but does not list the current directory starting with. And the parent directory starting.

-C with-lt: sort by ctime and display ctime (the last time when the file was changed); with-l: Display ctime but sort by file name; otherwise, sort by ctime

-C. List projects from top to bottom in each column

-Color [= WHEN] controls whether to use color to distinguish files. WHEN can be one of never, always, and auto.

-D: display the directory like a file instead of the file under it.

-F does not sort the output files. The-aU option takes effect and the-lst option is invalid.

-G is similar to-l, but does not list the owner

-G-no-group does not list all group information

-H-human-readable lists the file size in a way that is easily understood by humans (for example, 1 k 234 M 1G)

-I-inode: List inode numbers of each file.

-K-block-size = 1 k, representing the file size in k bytes

-L list the object owner, permission, and file size except the object name.

-M all items are separated by commas (,) and the whole row width is filled.

-O is similar to-l. All information except group information is displayed.

-R-reverse in reverse order

-R-recursive: list all sub-project layers at the same time

-S-size: list all sub-directory layers in Block size

-S sort by file size

-T sort by file modification time

-U with-lt display access time and sort by access time

-V sort by version

-U is not sorted in the original order of the file system.

-W-width = COLS: Specify the screen width without using the current value.

-X: list items row by row instead of column by column.

-X sort by extension

-1: list an object in each row.

-Help: Display help information and exit

-Version: displays the help information and leaves.

4 Examples of Common commands

Example 1: calculate the number of items and directories in the current directory

Ls-l * | grep "^-" | wc-l-file count

Ls-l * | grep "^ d" | wc-l-number of directories

Example 2: List the absolute paths of all files in the current directory without recursion

Find $ PWD-maxdepth 1 | xargs ls-ld

 

Extension

1. display the color directory list

 

Open/etc/bashrc and add the following line:

Alias ls = "ls-color"

 

The color directory list will be displayed as shown in Slackware when bash is started next time. The color meanings are as follows:

1. Blue-> directory

2. Green-> executable files

3. Red-> compressed file

4. Light blue-> link file

5. Gray-> other files