Basic operation under Linux 02 (file related commands) __linux

1. Access to User root directory
CD ~ or CD
CD ~hadoop
Back to the original path
CD-


2. View file Details
Stat A.txt


3. Mobile
MV a.txt/ect/
Renamed
MV B.txt A.txt
Move and rename
MV A.txt. /b.txt


4 copies and renamed
CP A.txt/etc/b.txt


5.VI Undo Modification
CTRL + U (undo)
Recovery
CTRL + R (Redo)


6. Name Order set alias (invalid after reboot)
Alias ll= "Ls-l"
Cancel
Unalias LL


7. If you want the alias to restart, you still need to modify
VI ~/.BASHRC


8. Add User
Useradd Hadoop
passwd Hadoop


9 Creating multiple Files
Touch A.txt B.txt
Touch/home/{a.txt,b.txt}


10. Copy the contents of one file into another file
Cat A.txt > B.txt
Append content
Cat A.txt >> B.txt




11. The A.txt and B.txt are set to be writable by the owner and the same group to which they belong, but others are not writable:
chmod ug+w,o-w a.txt B.txt


chmod a=wx C.txt


12. All files and subdirectories under the current directory are set to anyone can read:
Chmod-r A+r *


13. Set the user owner of the A.txt to users, and the group's owner is set to Jessie:
Chown Users:jessie A.txt


14. The user of all files and subdirectories under the current directory is Lamport, and the group owner is users.
Chown-r Lamport:users *


15. Copy all Java language programs to the finished subdirectory:
CP *.java finished


16. List all files in the current directory and its subdirectories that are java.
Find-name "*.java"
Find files in the current directory with Java extensions
Find-name *.java


17. Delete files in the current directory where the extension is Java
Rm-f *.java