Frequently used Linux commands

It is a memorandum of a little operation when operating a Linux server I will update it every time to add more

cd command [move]

Command to move to the specified path

[[email protected] ~]$ cd /var/www
[[email protected] www]$

pwd command [Know your current location]

Command to check the current location

[[email protected] ~]$ pwd
/home/vagrant

cp command [duplicate]

Copy command. Commands for duplicating files, folders, etc.

cp copy source file copy destination file

cp fileA.txt fileA_copy.txt




 Frequently used options

 |option|Contents|
 |:---------------|:------------------|
 | -a |Preserve and copy the attributes of the original file and the directory structure. As far as possible.|
 | -r |Copy the entire directory (recursive)|


 > Copy the entire folder
```cp -r Copy source directory Copy destination directory```

 Other options Reference URL
https://eng-entrance.com/linux_command_cp




## mv command [move / rename]
 Move or rename files etc.

##### File name change
 > mv Target file File name you want to change
```mv file1 file2```

 Use when you want to change the file name to the file name you want to change
 * Also, it works even if you change the folder name.

##### Move
 > mv file 1 file 2 file 3 directory A

#### **`mv file1 file2 file3 ./dir`**

Move the file to the target folder

rsync command [Synchronize]

Command to "sync" files and directories with remote environment

rsync-[options] sync source / sync destination /

Frequently used options

option Contents
-a Archive mode
-v Display the operation details
-z Compress the data in transit

Permission-related options

option Contents
-e Hold executable attributes
-p Hold permissions
-g Keep the owning group as is
-o Keep the owner as is (root authority is required to keep the owner other than yourself)

Symbolic link related options

option Contents
-l Copy the symbolic link as it is

Click here for other details https://www.atmarkit.co.jp/ait/articles/1702/02/news031.html

Example of using ssh to sync to your own PC
rsync -avz -e 'ssh -i ~/Documents/login/[Key name].pem'  --rsync-path='sudo rsync'  [ssh user]@[domain]:/var/www/html/[Server target directory] ./[Local target directory name]

df command [Display free disk space]

You can see the free space on the disk

Frequently used options

option Contents
-h Display in easy-to-read units according to size
--total Show total free space

du command

Show disk usage

du [Options] [File or Directory]

Frequently used options

option Contents
-s Show only totals for specified directories(Do not include subdirectories)
-d depth Specify the depth of the directory to be aggregated
-h Displayed in easy-to-read units according to size
Capacity display only for folders directly under the directory

du -sh ./* | sort -nr

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