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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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Linux bash for loop

Q. How do I use bash for loop under Linux operating systems?
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Bash Shell: Replace a String With Another String In All Files Using sed and Perl -pie Options

How do I replace a string with another string in all files? For example, ~/foo directory has 100s of text file and I’d like to find out xyz string and replace with abc. I’d like to use sed or any other tool to replace all occurrence of the word.
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Bash Shell Check Whether a Directory is Empty or Not

How do I check whether a directory is empty or not under Linux / UNIX using a shell script? I would like to take some action if directory is empty on a Linux or Unix like system. How can I check from bash/ksh shell script if a directory contains files? How do I check whether a directory is empty or not?
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Linux Bash Script Check File Existence

How do I check if a file called /tmp/foo.txt exists or not using a shell script under Linux operating systems?
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