2.4 Linux File & Folder Commands
1. cat: create & show file ( create file )
#cat > a.txt = create new file with content
pass Ctril + D: Save & Exit
#cat a.txt = view content file "a.txt"
2. head: view first lines of file
#head -3 a.txt = display first 3 lines of file
3. tail: view last line of file
#tail -3 a.txt = show last 3 lines of file
4. grep: Search character in file
#grep 'abc' a.txt = find character 'abc' in file
5. mkdir: create directory ( create folder )
#mkdir test = create directory name: test
6. cd: change directory
#cd test = create directory name: Test
#cd .. = go back one directory
#cd ../.. = go back two directory
#cd ~ = go to home directory
#cd / = change current directory to root directory ( ចូល user root )
7. pwd: show current working directory
#pwd = show current directory to root directory
8. cp: copy file / folder
#cp -r test1 test2 = copy directory test1 to test2
#cp a.txt test1 = copy file a.txt to directory test1
9. mv: move/rename file/folder
#mv a.txt test = move file a.txt to directory test
#mv a.txt b.txt = rename file a.txt to b.txt
#mv test1 test11 = rename directory test1 to test11
10. rm: remove file / folder
#rm a.txt = remove file a.txt
#rm -r test = remove folder test
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