Linux basic commands

Linux Common Basic Command collation

1-CD Switching directories

The CD enters the user's home directory;
CD ~ Enter the user's home directory;
CD-Returns the directory where the directory was before it entered;
Cd.. Return to the parent directory (if the current directory is "/", then "/"; "..." after execution) The meaning of the parent directory);
Cd.. /.. Return to the top level two directory;
CD!$ Use the parameters of the previous command as CD parameters.

2-pwd shows the current working directory

3-ls View current Directory

In the Linux file system, all with dots (.) The starting filenames are hidden files (differentiate between ls-a and Ls-a)

-D: Do not display directory contents, but only display the directory name

-L--long: Display detailed properties of a file in long format

4-mkdir Creating a Directory

5-rmdir Delete Empty directories (only empty directories can be deleted)

6-RM Deleting a catalog file

7-touch Create an empty file (note the difference from mkdir)

8-stat Display details of the specified file, more detailed than LS

-C (More important)

9-nano

Usage: Nano [options] [[+ Row, column] filename] ...

^ The bracket character represents the CTRL key

Save the contents of a document

Ten cat-e-n-b Ctrl+d exit

Usage: cat [options] ... [File] ...

-B,--number-nonblank number of non-null output lines

-S,--squeeze-blank do not output multiple lines of blank lines, merge whitespace behavior line

-E,--show-ends displays "$" at the end of each line

-N,--number of all lines for the output

Reverse output of one-to-one TAC cat

Usage: TAC [options] ... [File]:

The first 10 rows are displayed by default in head

Usage: head [options] ... [File] ...

-C,--bytes=[-]k printthe first K bytes of each file;

withthe leading '-', print all and the last

Kbytes of each file

-N,--lines=[-]k print the first K lines instead of Thefirst 10;

With the leading '-', print all and the last

Tail monitor changes in small files

Usage: tail [options] ... [File] ...

Print the last ten lines of each FILE to standard output.

With more than one FILE, precede each with a header giving the filename.

-F,--follow[={name|descriptor}]

Output appended data as the file grows; An absent option argument means ' descriptor ' use CTRL + C to exit

+ Less (page display)

• Date Time

Hardware Clocks Hwclock Clock

-S

-K

--set--date

system clock Date (kernel emulation)

Synopsis

Date [OPTION] ... [+format]

Date [-u|--utc|--universal] [mmd‐

DHHMM[[CC]YY][.SS]] For example: Date "031211092017"

[[email protected] desktop]# date-s "2017/11/11 11:11:11"

[[email protected] desktop]# date-s "2017-11-11 11:11:11"

%F full date format, equivalent to%y-%m-%d

%d Date by month; equal to%m/%d/%y

%s number of seconds since UTC 1970-01-01 00:00:00 [email protected] desktop]# date +%s

Cal-y

• Shutdown

Halt

Shutdown

Synopsis

shutdown [OPTIONS ...] [TIME]    [WALL ...] absolute time and relative time

-K do not halt, Power-off, reboot, Justwrite wall

Message.

-C Cancel a pending shutdown. This could be usedcancel

The effect of an invocation ofshutdown with a

Time argument that's not ' +0 ' or ' now '

• Logoff (differs from Windows)

Exit:

Logout

Ctrl+d

• Copy

cp

Usage: CP [options] ... Source file destination file (unit copy can be renamed)

OR: CP [options] ... Source file ... directory (multivariate replication)

OR: CP [options] ...-t directory source files ... (usually not used)

Copy source to DEST, or multiple source (s) todirectory.

Options [[email protected] desktop]# echo $?

- D :

- P : The ability to preserve the properties of a file while copying files and all

-r/r :

-A : Equivalent to a combination of options

mv

Usage: MV [options] ... [-t] source file destination file

Or: MV [options] ... Source file ... Directory

Or: MV [options] ...-t directory source files ...

Rename source to DEST, or move source (s) todirectory.

Linux basic commands