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Unix / Linux: Remove duplicate lines from a text file using awk or perl

I have a text file with exact duplicates of lines. I need to remove all those duplicates lines and preserves the order too on Linux or Unix-like system. How do I delete duplicate lines from a text file?
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Linux: lxc forcefully stop and kill container

I want to stop the application running inside a container. I issued lxc-stop -n myapp but the command is not returning to the shell prompt, and my lxc container entered in hang state. How do I kill my container running on Ubuntu Linux host?
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How to check Debian/Ubuntu Linux package version using apt-get/aptitude command

I am a new Debian / Ubuntu Linux sysadmin. I would like to find out what version I would install if I ran the apt-get command. How do I find out which versions of a package can I install using apt-cache/apt-get command? How do you check package version using apt-get/aptitude on Debian or Ubuntu Linux server?
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How to copy permissions from one file to another on Linux

I need to copy or clone file ownership and permissions from another file on Linux. Is there a bash command line option to clone the user, group ownership and permissions on a file from another file on Linux operating system?
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How to find out Raspberry Pi GPU and ARM CPU temperature on Linux

I am using a Raspberry PI 2/3 credit size computer. How do I find out my GPU or ARM CPU temperature from Linux operating system command line option?
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How to upgrade OpenSSH 7.0 to 7.2 on a OpenBSD Unix and Linux

OpenSSH version 7.2 has been released. How do I install or upgrade my existing OpenSSH version to 7.2 on a OpenBSD unix operating system?
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How to run a command or script after running apt-get command on a Debian or Ubuntu Linux

How do I run custom command after ‘apt-get upgrade‘ or ‘apt-get dist-upgrade‘ on a Debian or Ubuntu Linux based system? How do I hook a script to apt-get command on my Ubuntu Linux server?
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