Linux Experiment II

First, Summary of Knowledge points:

What is Shell:shell is a system program provided to the user by the Linux/unix system to interpret the user's commands. It is the interface between the user and the system kernel.

Common shell commands are: sh, csh, ksh, bash;

Second, the Simple shell command:

(1) Echo: Display string

(2) Date: Displays or sets the system date and time

Date: Displays the current date and time of the local time zone

Date-u: Displays the current date, time, or UTC (That is, zero zone)

(3) Cal command: Display calendar

Command format: cal [parameter name] [month] [year]

Aa.

Cal-y: Displays all calendars for the current year

CAL-J displays the number of days in the current month from January 1

(4) Who order

Who-a print out the system boot time, current user, user run level

Who-d prints out the dead process and does not output if there are no dead processes.

Who-q Print the current user name and number of logged in users

Who-u to print the login information of the currently logged in user

Who-r Print system operating level

(5) Clear command

Empty the contents of the current page

Third, the experiment two parts:

3, browse the file system;

(1) PWD:

To view the current directory:

　　

(2) Ls-l

　　

(3) Ls-ai

(4) CD

(5) Direct use of CD:

(6) Create a subdirectory with mkdir subdir, change the working directory to SubDir

4. File Operation:

(1) Run the date >file1 and run the cat file1

(2) Show date command with Man

(3) Running Cat SubDir

(4) Running Man Date>>file1 no reaction.

(5) Running cat file1, you will see the man page of date

(6) Using Ls-l file1

Run ln file1. /FA, then run ls-l file1

(7) CP file1 File2, then ls-l

(8) Run MV File2 File3, then ls-l

Linux Experiment II