Instructions and usage of linux touch chattr

linux touch,chattr instructions

man touch

NAME  
 touch -  Change the timestamp of the file  
SYNOPSIS 
 touch [OPTION]... FILE... 
DESCRIPTION 
  Update file atime and mtime For the time being  
 -a  Fix only the time the file was retrieved  
 -c, --no-create  A file that does not exist is not created as a new file  
 -d, --date=STRING  use STRING Instead of using the current time  
 -m  Modify only when the contents of the file have changed  
 -t STAMP  use [[CC]YY]MMDDhhmm[.ss] Format the time rather than the current time  
 --help  Show help  
 --version  Display version information  

man chattr

NAME   
 chattr -  Change the hidden properties of the file  
SYNOPSIS 
 chattr +-=[ASacDdIijsTtu] files... 
OPTIONS 
 + Increase: 1 Special parameters; - Remove: 1 Special parameters; = : set parameters as set parameters  
 A : if there is any access to this file or directory, his atime The timestamp will not be modified  
 S : when making any changes to a file, it will be written to disk "synchronously"  
 a:  This file will only add data, not delete or modify data, only root To modify this property  
 c:  This file will be "compressed" automatically. It will be extracted automatically when it is read. It will be compressed first and then stored when it is stored  
 d:  The file or directory will not be dump The backup  
 i:  Make the file unable to be deleted, renamed, linked, written or added, only root Can set this property  
 s:  When the file is deleted, it may be removed completely and cannot be recovered  
 u:  with s Instead of deleting completely, you can retrieve the deleted file  

The man page of this instruction is really difficult to understand. After reference materials, I understood part of the content, so I did not follow the content of man page

man lsattr

NAME  
 lsattr -  Shows the hidden properties of the file  
SYNOPSIS 
 lsattr [ -RVadv ] [ files... ] 
OPTIONS 
 -R  Recursively lists data from subdirectories as well  
 -V  Displays version information for the program  
 -a  The properties of the hidden file are also displayed  
 -d  If it is a directory, list only the properties of the directory itself, not the files in the directory  

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