カレント・ディレクトリのファイル一覧
    total 52K
    drwxrwxr-x   2 ubuntu ubuntu 4.0K Feb  2 07:31 .
    drwxr-xr-x 333 root   root    120 Feb  2 07:31 ..
    -rw-r--r--   1 root   root      0 Feb  2 07:31 exec_stderr.txt
    -rw-rw-r--   1 ubuntu ubuntu    0 Feb  2 07:31 exec_stdin.txt
    -rw-r--r--   1 root   root     55 Feb  2 07:31 exec_stdout.txt
    -rw-r--r--   1 ubuntu ubuntu  283 Jan  1  2000 Main.sh
    -rw-rw-r--   1 ubuntu ubuntu  406 Feb  2 07:31 main.tar.gz
    -rwxrwxr-x   1 ubuntu ubuntu  522 Feb  2 07:31 runner_mysql
    -rwxrwxr-x   1 ubuntu ubuntu  229 Feb  2 07:31 runner_php
    -rwxrwxr-x   1 ubuntu ubuntu  21K Feb  2 07:31 run_user
    -rw-r--r--   1 ubuntu ubuntu  291 Jan  1  2000 sample.txt

サンプルテキスト
        This line has 4 space indent.
    This line has no indent.
     This line has 1 space indent.
      This line has 2 space indent.
       This line has 3 space indent.
        This line has 4 space indent.
        This line has tab indent.
    This line has no indent.
        This line has tab indent and \/ backslash.