Here we will learn about the command related to File System
List of File in Folder
ls command can be used to list down all the files in Folder.
firstcript Hadoop script1 ShellScript tree.txt
Note*: All command in Linux are case sensitive. So ls or Ls or lS or LS all are different.
By default ls command will show the files from current directory. If you want to display list of files from different directory then provide the directory path as an argument.
viveka@ubuntu:~/Learning$ ls ShellScript/
2script 3script firstscript
With ls you will get list of files and folder in alphabetical order. If you want to see other details of files/folder you can user other argument with ls.
- -l : Show long listing format of file or folder
viveka@ubuntu:~/Learning$ ls -l total 63
-rwxr-xr-x 1 root root 11 Aug 5 23:22 firstcript drwxrwxr-x 3 viveka viveka 1024 Aug 11 19:35 Hadoop -rwxr-xr-x 1 viveka viveka 91 Aug 6 23:47 script1 drwxrwxr-x 2 viveka viveka 1024 Aug 7 21:29 ShellScript -rw-rw-r– 1 viveka viveka 58833 Aug 7 19:59 tree.txt
- -a (minus and small A) : ls by default ignores . (Current directory) and .. (Parent Directory) -a is used to display .. and . while listing files and folders.
viveka@ubuntu:~/Learning$ ls -a
firstcript Hadoop script1 ShellScript tree.txt viveka@ubuntu:~/Learning$
- –file-type : Used to identify file types
viveka@ubuntu:~/Learning$ ls --file-type firstcript
Here Hadoop and ShellScript are directories while others are files. As you can differenciate by seeing / in the end.