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Ubuntu Uninstall deb Package

How do I uninstall deb packages under Ubuntu Linux using GUI or CLI (command line) methods?
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Find Linux Kernel Version Command

How do I find out my Linux kernel version? How can I find the kernel version at shell prompt on Linux?
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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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UNIX Create User Account

How do I create a user account under UNIX operating system and assign a password to user account so that he / she can login into server or UNIX workstation?
Answer to “UNIX Create User Account”

xargs: How To Control and Use Command Line Arguments

I am trying to use xargs command using shell pipes and not able to understand how to control and use command line arguments. For example I'd like to find out all *.c file located in 100s of sub-directories and move them to another directory called ~/old.src. How do I use command line args with xargs to achieve the same?
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How do I show networking routing table information under Solaris UNIX operating systems using a shell prompt?
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Apache: Graceful Server Reboot From Shell

How do I gracefully restart Apache web server from a shell prompt?
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