Week 7, Intro to Unix lab 2016

Content

• Recap homework
  • sed and order of arguments a -e option
  • /dev/stdin
  • while read line; do echo $line ; done < my_input_file
• comm, vimtutor
• Vim
• ps if time

Homework

• (0 points) - recap Sed
  • Understand Sed tutorial
  • Get inspiration from sed one-liners
• (your skills) - learn Vim basics and write every homework in Vim. Start with vimtutor and you may try vimbook
• (3 points) Write a script tree.sh [dir_path] which prints tree like structure of directories under the dir_path.
  • if dir_path argument is omitted used current working directory
  • if it is called on non existing path or file write a sensible error message and exit with exit code bigger than 0

# example output
DIR: A 
    a1.txt
    a2.txt 
    DIR: B
        b1.txt 
DIR: C
    c1.txt
    k1.txt

Bonus

• (2 point) You have a file commands.txt where each line has following format:
  • Run COMMAND with options "OPTIONS" and arguments "ARGUMENTS"
  • Write a script which will execute the commands and hadle a nasty formated options and arguments
  • Nasty example:
    • Run ls with options "-al" and arguments "I said: \"this is nasty\""
  • Common examples:

Run ls with options "-al" and arguments "$HOME"
Run pwd with options "" and arguments ""
...