Lab setup data from the Pluralsight course on:

Getting Started with the Linux Command Line

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Parsing a data stream

cut -d: -f3 /etc/group
cut -d: -f3 /etc/group | sort -n
cut -d: -f3 /etc/group | sort -rn

Writing a file from standard error

wget pluralsight.comm 2> errorfile.txt

Using command substitution

cd /lib/modules/`uname -r`/kernel

Working with user inputs

#!/bin/bash
declare -i number1
declare -i number2
declare -i total
echo "What's your favorite number? "
read number1
echo "What number do you really hate? "
read number2
total=$number1*$number2
echo "Aha! They equal " $total
exit 0

Looping with for

#!/bin/bash
for i in {0..10..2}
   do
       echo "We've been through this $i times already!"
   done

##################################

#!/bin/bash
for filename in file1 file2 file3
   do
      echo "Important stuff" >> $filename
   done

if-else controls

#!/bin/bash
echo "What's your favorite color? "
read text1
echo "What's your best friend's favorite color? "
read text2
   if test $text1 != $text2; then
      echo "I guess opposites attract."
   else
      echo "You two do think alike!"
   fi
exit 0

Counting with while

#!/bin/bash
declare -i counter
counter=10
   while [ $counter -gt 2 ]; do
      echo The counter is $counter
      counter=counter-1
   done
exit 0

Testing input using case

#!/bin/bash
echo "What's tomorrow's weather going to be like?"
read weather
   case $weather in
      sunny | warm ) echo "Nice! I love it when it's " $weather
      ;;
      cloudy | cool ) echo "Not bad..." $weather" is ok, too"
      ;;
      rainy | cold ) echo "Yuk!" $weather" weather is depressing"
      ;;
      * ) echo "Sorry, I’m not familiar with that weather system."
      ;;
   esac
exit 0