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environment variables

While using mv or rm command I get command line length error (Argument list too long error). How do I find out current running shell command line length limitations? How do I overcomes these limitations while writing UNIX / BSD / Linux shell utilities?
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FreeBSD Display Environment Settings

Q. How do I display shell environment settings under FreeBSD operating systems?
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How To Read / Print $PATH Shell Variable

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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Ubuntu Linux Install Apache 2 Web-Server Software

How do I install Apache 2 software on Ubuntu Linux using command line options?
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