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How do I use export command under Linux or Unix like operating systems to set variables?

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I‘ve installed few software using tar ball format under Linux or FreeBSD ports using make command. However, my system doesn’t recognize the installed command. I’ve to reboot the system or log out and log in again to use the same. How do I fix this problem?

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Q. I see pathmunge used in few scripts under Red Hat Enterprise Linux. Can you explain the use of pathmunge under RHEL / CentOS / Fedora Linux?

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How do I add a new path to $PATH variable under Linux and UNIX like operating system? What is my path, and how do I set or modify it using csh/tcsh or bash/ksh/sh shell?

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Q. . I’m a new Linux user. Can you tell me commonly used Linux / UNIX command?

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