Add(argument_check.md) Add argument check solution (#323)
* Add(argument_check.md) Add argument check solution * Change(argument_check.md) Add objectives of script
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topics/shell/solutions/argument_check.md
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topics/shell/solutions/argument_check.md
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## Argument Check
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### Objectives
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Note: assume the script is executed with an argument
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1. Write a script that will check if a given argument is the string "pizza"
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2. If it's the string "pizza" print "with pineapple?"
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3. If it's not the string "pizza" print "I want pizza!"
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### Solution
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```
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#!/usr/bin/env bash
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[[ ${1} == "pizza" ]] && echo "with pineapple?" || echo "I want pizza!"
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```
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