variable value

How do I set or create variables within my shell script or at command line under Linux and Unix like operating systems?

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I‘m trying to set ‘thread_concurrency to 8 under Linux MySQL server. But when I try to restart the mysql server, I get the following error:

[ERROR] /usr/local/libexec/mysqld: unknown variable ‘thread_concurrency=8′

How do I fix this problem?

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Q. How do I display shell environment settings under FreeBSD operating systems?

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Q. I’m new to Unix / Linux and I’d like to print current values of $PATH variable. How do I read $PATH from a shell prompt?

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