Liunx Foundation

Linuxshell Interpreter
One 、 Basic commands （ To continue ）

 1. cp copy  Copy  -copy files and directories
  	  copy source to destination
  	   Copy file ：
  	   Single file ：
  	  touch f.txt
  	  ls
  	  mkdir hunan
  	  cp f.txt hunan f.txt  Copy to current directory hunan in 
	 Copying multiple files ：
	cp lu.txt wu.txt zhang.txt hunan
	 command     Source file                     Destination 
	cp *.txt sc  The use of wildcards 
	
	 Using absolute paths 
	cp /etc/hostname /lianxi/hunan
	ls hunan

	 Copy 、 Paste 、 rename 
	cp f.txt feng.txt
	 Set the f.txt  Copy to the current directory and rename it feng.txt
	
	 Copy folder ：
	-r recursive copy directories recursively
	cp hunan beijing -r  Recursive replication hunan Folder to Beijing folder 
	 Copy multiple folders ：
	cp /boot /var /lianxi/hunan -r

 skip cp  Override reminder ：
1、 Remove alias , Don't use -i Options 
unalias cp
cp /var /boot /lianxi/sc -r
2、 Use cp The absolute path of command 
/usr/bin/cp /var /boot /linaxi/sc -r

mv  shear 
1、 When the following folder exists , It's mobile. 
2、 When the following file or folder does not exist , It's renaming 
mv beijing/ changsha/ lu.txt guangdong/

 Move 、 Paste 、 rename 
mv xiao.txt yue/xw.txt

which  Find out where the command is 
which cp 
/usr /bin/cp

Two 、 Basic concepts

 1. -usr unix system resource
  System resources 
 2.bin binary  Binary system 
 3.shell Interpreter ：  It's a program , The user accepts user input , Then analyze the syntax of the command entered by the user , Know what commands are , What are the parameters , What are the options , Will tell us linux  The kernel starts related processes 
 4、 What the kernel does ：   The kernel is linux The core software inside 
	1. Yes cpu Scheduling management 
	2. Allocate memory 
	3. Manage file systems 
	4. Manage processes 
	5. Manage other hardware 
5.shell Script ： scripts
	 A script is actually a file , There are a lot of linux command 
	vi  yes linux Text editor in --》 Notepad 
	vi yes linux Character interface Notepad , Used to write scripts , Modify the contents of the document 
	
	[[email protected] lianxi]# vi  hello.sh  Script name 
1. By letter i Get into vi The input mode of the editor   insert
2. Input content 
3. Press ESC key , Leave input mode    escape 
4. Input :wq   Enter last line mode , Exit and save   w write  q quit
cat  hello.sh     View the script hello.sh Contents of Li 

mkdir  wujun 
cd wujun

# Use for How many empty files are created in a circular batch 
for i in {1..100}
do
        touch sc$i.txt
done

ls

# Output one hello world
echo "hello,wolrd"

# Judge sc200.txt Whether there is 
if [ -f sc200.txt ]
then
        echo "create file sc200.txt ok"
else
        echo "no file sc200.txt"
fi

3、 ... and 、 practice

 Write a script sc_yourname.sh
 Realization function ：
	1. stay / Directory create a new folder hunansc
	2. stay /hunansc New under the directory feng1 To feng200 Folder 
	3. Output a paragraph , I'm learning shell Script 
	4. Judge /hunansc Whether there is a folder under the directory feng80 This folder , If there is an output  feng80 dir is  exist
	 If there is no output  feng80 dir is not exist
	[ -d feng20 ]  Judge feng20 Whether there is 
	5. Show all created feng1 To feng80 Effects of folders 


mkdir  /hunansc
for i in {1..200}
do
        mkdir feng$i
done

echo "i am learning shell scripts!"

if [-d feng80]
then
        echo "feng80 dir  exists"
else
        echo "feng80 dir is not exist"
fi

ls