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Linux: Set Environment Variable

Bash shell is used for various purposes under Linux. How do I customize the shell environment variable under Linux operating systems?
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UNIX: Set Environment Variable

How do I set environment variables on UNIX systems?
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Ubuntu Set User Profile Under Bash Shell

How do I set user profile under bash shell running Ubuntu Linux operating systems?
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Q. My Oracle XE installation was working fine, but today I'm getting an error - which read as follows under Ubuntu Linux :

ORA-12154: TNS:could not resolve the connect identifier specified

How do I fix this problem without reinstalling Oracle?
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