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bash shell scripting

Bash Shell: Find Out If a Variable Is Empty Or Not

My shell script depends upon user input. How do I find out if a variable called $_JAIL path is empty under Linux / Apple OS X / Unix like operating systems?
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Bash Check If Shell Is Interactive or Not Under Linux / Unix Oses

How do I check in GNU/Bash if a shell is running in interactive mode or not while writing shell scripts?
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Grep Include Only *.txt File Pattern When Running Recursive Mode

I'm using Debian Linux as my development workstation. I would like to search a directory called ~/projects/ recursively for "foo" word only for *.txt files. How do I search all text files in ~/projects/ for "foo" word using grep command?
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How do I determine if a function called foo() is already defined in a bash script or not? If a function called foo() is defined just call it or show an error message?
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BASH Shell: Test If a File Is Writable or Not

Q. How can you test if a file is writable under UNIX / Linux bash shell scripting?
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Bash Append Text To a Variable

How do I append additional text a variable? For e.g., I've a vech set as follows:
I'd like to add (append) "Bus" word to $vevh under UNIX scripting using bash?
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