ls

List directory contents, normally sorted by filename alphabetically.

How:

cd ~/ls

• List directory contents of the current directory:

  ls

  file_1 file_2 file_3

• Same, but long listing:

  ls -l

      total 3
      -rw-------    1 yuni     yuni           24 Aug 19  2000 file_1
      -rw-------    1 yuni     yuni           48 Nov 20  1989 file_2
      -rw-------    1 yuni     yuni           72 Jul 15 15:38 file_3

• Same, show hidden files (filename starts with ".") too:

  ls -la

      total 28
      drwx------    2 yuni     yuni          512 Jul 15 15:36 .
      drwx--x--x  252 yuni     yuni        24576 Jul 15 15:36 ..
      -rw-------    1 yuni     yuni           24 Aug 19  2000 file_1
      -rw-------    1 yuni     yuni           48 Nov 20  1989 file_2
      -rw-------    1 yuni     yuni           72 Jul 15 15:38 file_3

• Same, reverse sort by modification time:

  ls -latr

      total 28
      -rw-------    1 yuni     yuni           48 Nov 20  1989 file_2
      -rw-------    1 yuni     yuni           24 Aug 19  2000 file_1
      drwx--x--x  252 yuni     yuni        24576 Jul 15 15:36 ..
      drwx------    2 yuni     yuni          512 Jul 15 15:36 .
      -rw-------    1 yuni     yuni           72 Jul 15 15:38 file_3

• Sort by file size:

  ls -laS

      total 28
      drwx--x--x  252 yuni     yuni        24576 Jul 15 15:36 ..
      drwx------    2 yuni     yuni          512 Jul 15 15:36 .
      -rw-------    1 yuni     yuni           72 Jul 15 15:38 file_3
      -rw-------    1 yuni     yuni           48 Nov 20  1989 file_2
      -rw-------    1 yuni     yuni           24 Aug 19  2000 file_1

• Show files in home directory that start with y and end with a digit range from 2 to 8:

  ls f*[2-8]

  file_2 file_3

• Show all files recursively (including all subdirectories) in  /ls:

  ls -R  /ls

      .:
      ./  ../  file_1  file_2  file_3  sub_dir_1/  sub_dir_4/
  
      ./sub_dir_1:
      ./  ../  file_A  sub_dir_2/
  
      ./sub_dir_1/sub_dir_2:
      ./  ../  sub_dir_3/
  
      ./sub_dir_1/sub_dir_2/sub_dir_3:
      ./  ../  file_B
  
      ./sub_dir_4:
      ./  ../  file_C