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BASH Shell

How to install wget on RHEL/CentOS 7 using yum

I am trying to download a file using ‘wget http://url’ syntax, but I am getting an error:
bash: wget: command not found

How do I fix this problem? How can I install wget on a CentOS/RHEL 7 or 6 server using yum command?
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Sysadmin because even developers need heroes!!!

How to add to bash $PATH permanently on Linux

I am a new Linux and bash shell user. How do I permanently set $PATH on Linux? How can I permanently add a directory to shell PATH on Linux?
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How to use curl command with http/2 on MacOS X

I am using a MacOS sierra (version 10.12.1). How do I use curl command with http2/ protocol? I am getting an error that read as follows:

            curl -I --http2 https://google.com
            curl: (1) Unsupported protocol

How do I solve this problem and use cURL with HTTP/2 on Mac OS X or MacOS Sierra?
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Linux how long a process has been running?

I‘m a new Linux system user. How do I check how long a process or pid has been running on my Ubuntu Linux server?
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How to get Ethernet Link Speed in MAC OS X Through Command Prompt

I‘m a Mac OS X user. How do I find out my Ethernet Link Speed in terminal using bash shell prompt? How do I see my current Ethernet connection Speed in Mac OS X?
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How to gzip and keep original file on Unix or Linux command line

I would like to compress a log file using gzip Unix command line utility, and I would also like to keep the original file. However, when I use the gzip my-app.log command, results in modifying my log file and renaming it my-app.log.gz. How do I force the gzip command to keep original file while maintaining the original file on Linux or Unix-like system?
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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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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 reload sysctl.conf variables on Linux

I am new Linux system user. How do I reload all sysctl variables without rebooting my server?
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Ubuntu Linux Change Hostname (computer name)

I am a new Ubuntu Linux laptop user. I setup my computer name to ‘tom’ during installation but now I would like to change the computer name to ‘jerry’. How can I remove tom and set it to jerry on Ubuntu Linux? How do I change the Ubuntu computer name from ‘ubuntu’ to ‘AvlinStar’?
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