Check if a directory exists in Linux or Unix shell

I need to check if a directory exists or not, within a shell script running on Linux or Unix-like system? How do I check if a directory exists in a shell script?
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How To Check If a Directory Exists In a Shell Script

How do I check if a directory exists in a shell script under Linux or Unix like operating systems? How can I check if a directory exists in a shell script on Unix-like system?
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Bash Shell Number Comparison

I am new Unix/Linux user. I am learning shell scripting. How can I compare numbers in bash shell?
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Bash Shell: Check File Exists or Not

How do I test existence of a text file in bash running under Unix like operating systems?
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Bourne Shell Exit Status Examples For Linux and Unix

Can you explains and provide us “Bourne Shell Exit Status Code” examples?
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Explain Usage Of The Linux Left Bracket /usr/bin/[ Command

Q. I see [ command in /usr/bin directory. What is the /usr/bin/[ command used for?
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BASH Shell Test If a File Is Writable or Not

How can you test if a file is writable under UNIX / Linux bash shell scripting and programming language?
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test command