[Day 2] 6. Some more commands

File Manipulation Commands

Displaying File Content

1. Number Lines:
   Copy

   cat -n <filename>

   • Displays the contents of the file with line numbers.
2. View First Lines:
   Copy

   head <filename>

   • Displays the first 10 lines of the file by default.
3. View Last Lines:
   Copy

   tail <filename>

   • Displays the last 10 lines of the file by default.
4. View Specific Number of Lines from Start:
   Copy

   head -6 <filename>

   • Displays the first 6 lines of the file.
5. View Specific Number of Lines from End:
   Copy

   tail -5 <filename>

   • Displays the last 5 lines of the file.

Extracting Middle Elements

• There is no direct option to print specific middle elements of a file. To achieve this, you need to combine commands, such as using
  Copy

  head

  and
  Copy

  tail

  .

Sorting and Reversing Content

1. Sort File:
   Copy

   sort <filename>

   • Sorts the file contents in lexicographical order (alphabetically).
2. Number-wise Sorting:
   Copy

   sort -n <filename>

   • Sorts the file contents numerically.
3. Reverse File Horizontally:
   Copy

   rev <filename>

   • Reverses the contents of the file line by line (horizontally).
4. Reverse File Vertically:
   Copy

   tac <filename>

   • Displays the file contents in reverse order (vertically).
5. Display Unique Values:
   Copy

   uniq <filename>

   • Displays only unique values in the file.
   • Works only on sorted data and requires consecutive duplicates to be filtered.