How to write the output into the file in Linux

How do I write the output into the file in Linux bash shell? Can you explain I/O redirection for both bash and POSIX shell to write data to the file under Unix or Linux?
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Bash Script: Find Out In What Directory Script Is Stored Under Unix Or Linux

How can I find out the path of the directory in which my bash shell script is located and store that path in _base variable?
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Bash / KSH: Define Delimiter (IFS) While Using read Command

How do I can set IFS (internal field separator) while using read command in bash loops?
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HowTo: Reverse a String In Unix / Linux Shell?

How do I reverse lines of a file or files under Linux or Unix like operating systems?
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Linux / UNIX: Bash Script Sleep or Delay a Specified Amount of Time

How do I pause for 5 seconds or 2 minutes in my bash shell script on a Linux or Unix-like systems?
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Linux / UNIX: Command For Executing a Shell Script

How do I execute a script under UNIX or Linux like operating system using command prompt?
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Bash Shell Find Out If A Command Exists On UNIX / Linux System ($PATH) OR Not

I want find out if a command exists on UNIX from a bash shell script. If command does not exists in $PATH, then I would like to display an error message on screen. How do I find out if a command exists on Posix system or not?
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bash shell script