"Book Notes" "Bird's-brother Linux private cuisine-Basic knowledge" section III File operations

Section III File operations

1. File attribute Ls–al (the first character of the filename is. for hidden files)
   Number of connections: How many file names are connected to the secondary node (i-node)
   Display the full time format: "Ls-l–full-time"
   File type permissions:-rwxrwx-
   The first file type: D-directory directory;-Files; l-link file link files; B-accessible random access device; C Serial Port device
   R Readable, W writable, x executable
   第2-4 for file owner rights, 5-7 for group permissions, 8-10 for other people
   
   
2. Change the group that the file belongs to: Chgrp users install.log the changed group name must exist in/etc/group.
   -R updates all files in the directory to this cluster
   
   
3. Change file Owner: Chown (-r recursive processing, all files in this directory are changed)
   Chown [-r] Account name file or directory
   Chown [-r] Account name: Group name file or directory
   
   
4. Copy file: CP (does not change file properties and permissions)
   CP Source Archive target file
   
   
5. Change permissions: chmod
   chmod [-r] XYZ file or directory (r4+w2+x1 = 7) (XYZ is the sum of the values of the Rwx property)
   chmod u/g/o/a +/-/= r/w/x file or directory (User,group,others,all)
   Can enter a directory, which is related to the X permission of the directory. W allows users to delete, update, create new files or directories.
   
   
6. Switch directory directive: CD
   
   
7. New empty file: Touch

"Book Notes" "Bird's-brother Linux private cuisine-Basic knowledge" section III File operations