Day-1.Linux Basic CLI(Command line interface)

1. Present working directory(pwd):

$ pwd

1. change directory(cd):

$ cd "dirName or path"

1. back one step directory(cd):

$ cd .. 

1. back root directory(cd):

$ cd /

1. from user to direct jump to the file (cd~):

$ cd~

1. List file (ls):

$ ls

1. List file with hidden (ls):

$ ls -a

1. List file with file permission details (ls):

$ ls -l

1. List file with permission and hidden files (ls):

$ ls -al

1. Make directory(mkdir):

$ mkdir "dirName"

1. create subdirectory at a time(mkdir):

$ mkdir -p dirM/2ndDir/lastDir

1. make any file(touch):

$ touch fileName.txt 

1. to check description of a file(file):

$ file fileName.jpg 

1. show the content of a file(cat,less):

$ cat fileName
$ less fileName

1. show any long file with head part or tail part(head,tail):

$ head fileName
$ tail fileName

1. clear terminal (clear):

$ clear 

1. to see last command you write(history):

$ history

1. copying file (cp):

$ cp fileNmae pathwithFilename
$ cp *.jpg /user/desktop/picture 

1. rename file and directory (mv):

$ mv oldFile newFile
$ mv oldDir newDir

1. move file(mv):

$ mv fileName /home/desktop/files
$ mv file1 file2 /files

1. remove file and directory(rm):

$ rm fileName
$ rmdir dirName
$ rm -r dirName
$ rm *.text 

1. know any commands manual(man):

$ man mkdir

1. find some file(find):

$ find /home -name fileName

1. see date and time:

$ date 
$ time 

1. want to see my ssh key:

$ cat ~/.ssh/id_rsa.pub

1. to show a short description about your desire command(whatis):

$ whatis cat

1. for exit from terminal(exit):

$ exit 
$ logout

1. locate a program file from Users file using which command:

$ which bash 

1. who is in the system to check by using whoami command:

$ whoami