Learn Linux lesson two with Amin Linux file and directory Management (2)-directives

PATH

< echo $PATH > //Show your environment variable values

PATH This is the variable name, ECHO is the command to display the information in the console

$ here is the value of getting a variable, path is the variable name

Together, the value of the PATH environment variable is displayed in the console.

[Email protected] ~]# echo $PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

< path= $PATH:/tmp/> Add/tmp Path to environment variable---TEMP!!!

(1) Copy a/TMP/LS2

(2) Join the path

(3) LS2 is supported but temporary

(4) Edit File profile finally added path= $PATH:/tmp/saved to be permanent.

(5) Input path=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin Cancel/tmp

(6) Open file Double click dd Delete profile add last line to save

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CP Copy

<cp/etc/passwd/tmp/1.txt > Copy files

<CP- R /tmp/aminglinux/ /tmp/aminglinux2 > Copy directory Note directory Plus-R and/

<tree!$> Call the last argument of the last line above

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CP and RM and MV actually have the-I copy directory when asked whether overwrite want to not prompt can use absolute path </USR/BIN/CP >

CP Copy directory when the current directory already exists will produce a new directory under the current directory

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MV Move

<mv/tmp/1.txt/tmp/aminglinux/2.txt > Move and change names

<mv/tmp/aminglinux/2.txt/tmp/ > moving files to the directory

Move Directory If the current directory already exists will be moved to the current directory

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2.13 Viewing text

(1) Cat See file Contents TAC Flashback view File contents

<cat-a initial-setup-ks.cfg > Line Tail +￥

<cat-n initial-setup-ks.cfg > Display line number

(2) More

<more initial-setup-ks.cfg > One screen display

<CAT/ETC/PASSWD >>anaconda-ks.cfg> append files to another file

Space: down Ctr+b: Up

(3) WC

<wc-l anaconda-ks.cfg > Display the number of file lines

(4) Less is best used

Same as more but supports mouse, arrow keys

See Q Exit;/system highlight n back to highlight shitf+n forward;? The system looks from the back forward;

SHITF g to row position, G to the beginning of the line

(5) Head

(6) Tail

<tail-n 2 anaconda-ks.cfg > View end of File two lines

<tail-f anaconda-ks.cfg > Dynamic viewing of File contents--View dynamic logs frequently

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2.14 File and Directory permissions

chmod Modify Permissions

Eg:d rwx r-x r-x. R=4;w=2;x=1; so =755.

D: Top 3 of the catalogue: 3 of the owner's permissions: 3 after all group permissions: other than the two.

RWX: Read, Write, execute

. : The last one has a point that is subject to SELinux

(1) Modify 1.txt permissions note Display permissions and then the file name

<chmod 777 Aming/1.txt>

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(2) Bulk modify directory and its directory content permissions

<chmod-r 770 aming/>

(3) Intuitive way to modify permissions

< chmod u=rwx,g=r,o=r aming/>

(3) All rights + one

< chmod a+x aming/>

Same < chmod a=x aming/> All Permissions x

Empathy < chmod a-x aming/>

Empathy < chmod u-x aming/>

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2.15 Changing owners and groups

Chown Modifying Owner permissions

CHGRP Modify the owning group permissions

< cat/etc/passwd > View created Users

Malt:x:1000:1000:malt:/home/malt:/bin/bash

Iammalt:x:1001:1001:iammalt:/home/iammalt:/bin/bash

(1) < chown iammalt/tmp/aminglinux > change owner only

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(2) < chgrp malt/tmp/aminglinux > modify the owning group

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(3)) < Chown malt:iammalt/tmp/aminglinux > change owners and Groups

< Chown:iammalt/tmp/aminglinux > Change Group only

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(4) < chown-r malt:iammalt/tmp/aminglinux > change owner and group include his internal files

This article is from "Malt's Sky" blog, be sure to keep this source http://iammalt.blog.51cto.com/12054231/1954929

Learn Linux lesson two with Amin Linux file and directory Management (2)-directives