Basic instructions under Linux.

What do you see in a directory (folder)? ------------ls-l

Where is it? -----------------pwd

Change Path-----------------CD

Create directory-----------------mkdir

Delete directory-----------------Rfdir can only delete empty directories

RM can delete files and directories at the same time

Man Help file

1. User commands

2, system invoke the pretext API

3. C library function

4, System equipment related

5. Configuration Files

6. Game Manual

7. A Theme

8. System Management Commands

Q exit

J Flip Down screen

K up

/Find

N Next

N Previous

Time-----------------------date+% formatted output

Time, time stamp +%s

Timestamp, time date–d @ timestamp + "%F%T"

Calendar-----------------------cal

Calculator--------------------BC

View disk space-------------DF

View Memory------------------Free

View process

Shutdown

Restart

Permissions

Edit Text

Installing the Software

More split screen display

Space to turn down one screen

b Turn up one screen

Q exit

Output Redirect: Change the output direction

Implementation mode: >filename

Ls–la ~ >tmp

>> Append output redirection

More TMP

Piping: FIFO non-reversible symbol: |

Cut gets the columns of the file

-D-Broken symbols

-F What columns to take Start-end,col

Sort by

-T column symbol

-K sorted Columns

-N Sorts by numeric size, default is ASCII

Du view the size of the files in the directory

Uniq to remove adjacent duplicate rows

WC statistics File Rows-L Word number-W characters-C

Find file: Find path –name "XXX" such as "*.h"

Find content in a file: grep "filtered content" filename

Find path –name "*.C" | Xargs grep "function" (grep for each item in the pipeline)

Package files TAR–CVF file name (not compressed)

Unpacking files TAR–XVF file name

tar.gz file: Compressed TAR–CZVF file name (compressed to GZ file)

Unzip TAR–XZVF file name

tar.bz2 files: compressing tar–cjvf file names

Unzip TAR–XJVF file name

File: View files Type

CTRL + C: End Process

Ctrl+d:eof (file End flag)

Shutdown: Shutdown–h time (how long after shutdown)

Init 0 Shutdown

1 Password-free administrator mode start

2 Open service, no network

3 Open Network services on a 2 basis

4 reserved

5 The default is to turn on the graphical interface

6 restart

TTY View current terminal

Types of files under Linux

1.-Normal file

2. D Catalog File

3, p pipeline file

4, B Block equipment files

5. C Character device file

s socket file

Command substitution: ' (number 1 left key)

Hard link: ln source filename New file name (for backup of important files)

Soft Connect: ln–s source filename New file name (equivalent to shortcut)

Readlink: View the contents of the soft connection itself

Permissions------r/w/x (/s/t) (read/write/execute/user set bit/sticky bit) Note that the T permission must be valid with X permission, otherwise invalid, displayed as T

R W-r--R--

Owner This group of users other users

chmod permission file name (change permissions)

U Master User

Group G users

o Other users +-= add or subtract replacement r/w/x

A All Users

Umask viewing or modifying file permissions

Mask & ~umask

Permissions for the Directory

1, R-ls

2, X-CD

3, W-touch

Basic instructions under Linux.