0. Try all the commands that are on the slides. 
1. Try changing your "bash prompt" using the shell variable PS1 by
    $ export PS1=' $ '
2. In bash, lookup how to have more useful info within the prompt (like time,
   current-directory, username, servername)
3. Change from one directory to another using .. and . and using absolute path.
4. Try touching an existing file and see if that file's timestamp changes.
    (See timestamp using "ls -l")
5. When using rm, to see which option is more important: -i and -f (one is 
    interactive, other is force) by aliasing rm to rm -i, and then using -f
    option. Try viceversa (aliasing to rm -f and then using -i option).
    Be sure to be in a directory without important contents.

6. Use both rmdir and rm -r for a directory with and w/o contents.
7. Try finding option of cp that RETAINS the original file's timestamp.
   Try using cp without this option. Find timestamp differences.

8. Try command "which ls" or "which any-command", and "which which".
9. Try changing permissions of some file and try overwriting it, or editing it.
   (Simplest way to edit it is to *append* to that file by using ">>". For example:
      $ ls > new_file # Hash is a comment, > means create-and-write (or overwrite-if-exists).
      $ cat new_file # to see the contents. (Or try less new_file)
      $ ls >> new_file # this is to *append* to the bottom.
   (Whatever typed after # is a comment: this is BASH syntax. No need to type for you.)

10. See what is "chmod 644 filename.txt". (optional)
11. Try less filename.txt (for a file that is there.)
    Try less and also more for images, pdf-files, ps files.

12. Try wc filename.txt, and also wc -l filename.txt, and then wc -l file1.txt file2.txt file3.txt
     (for existing files!)
13. Use head and/or tail for all lines EXCEPT first 10 lines, for last 10 lines,
    just first 10 lines, etc., for 20th to 30th lines (including both 20 and 30).

14. Try alias and unalias commands.
15. Try copying a file using cp, but also RETAINING the timestamp of the original file.

16. Look up "sed one liners" on google and try a few of them (like
    double-spacing a file or removing out empty lines) using sed.

17. Make two csv files (with delimiter : ) with headers respectively:
      Sr.Num: RollNum: Name: Hostel: Dept   (for file1.csv)
      Sr.Num: RollNum: ExtraCol: Name: Hostel: Dept   (for file2.csv)
    and concatenate them but by removing out the ExtraCol of file2.csv, and
    also without repeating the header again. No temporary file creation
    allowed

18. Thanks to Ashwith Rego, try
      head -n1 sample.csv && tail -n+2 sample.csv|sort -t, -k4n
    for not mixing the header line into the sorting work.
    Look up && on google by typing "bash &&"

----------- ULT content ends here. Bash content exercises begin below.------

1. Save a spreadsheet as a csv file (just the active sheet). Just "Save as" and choose csv.
    from a google spreadsheet, use "Export as" and csv file. Choose different delimiters
    if asked (maybe semicolon ";"  or colon ":" ) Then try cut, paste related commands from the slides.

2. For more info about pipe ( | ), try apropos pipe first (and then see "tee" and see "popen".)
3. Try 20th to 30th line of a file using pipes ( | ).
4. pipes go well with sed. Search on internet for "sed one liners". Use some sed one-liners
    together with pipe to perform some operations on csv files.
5. For a file called new_command.sh file, look up difference between 
     $ ./new_command.sh
           and 
     $ . new_command.sh
           and
     $ source new_command.sh
    (with new_command.sh having some simple commands like "echo hello", sleep, etc.

6. Try "which ls", "which which", "file full-path-of-ls-command", "file $(which which)" and
      also "file `which ls`" (for exercise 21, execute whatever is amidst double quotes ".
        Also, note open quote (above tab key)).

7. make new variable names by (for example). 
       $ variab="New variable"
    and see its value by 
       $ echo $variab
    and also try
       $ echo $var<TAB> (to see completion)
    Try $ echo $<TAB> (to see all variables, try double TAB for seeing ambiguities))

8. Try the exercises about mp3 files (renaming, removing spaces, etc.)

9. Amongst various txt files in a directory, some having read permissions,
    some not having, concatenate all of them into a new outputfile, and store the
    errors into a separate errorfile (and denied permissions, etc.)