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PHP Fatal error: Call to undefined function curl_init() in /home/httpd/a/includes/functions.php(1)

I setup a LEMP (Linux, Nginx,MySQL, PHP ) stack. But, getting the following error in /var/log/nginx/error.log file:
    PHP Fatal error: Call to undefined function curl_init() in /home/httpd/a/includes/functions.php(1)
How do I solve this problem on Linux server?
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PHP Fatal error: Call to undefined function gzinflate()

I have a php script and whenever I run it, I get the following error message in my log file:
     2017/02/05 23:25:46 [error] 9696#9696: *10 FastCGI sent in stderr: “PHP message: PHP Fatal error: Call to undefined function gzinflate() in /home/xxxx/http/includes/functions.php(1) : eval()’d code on line 1″ while reading response header from upstream, client: 10.218.105.1, server: newsletter.cyberciti.biz, request: “GET /a/ HTTP/1.0”, upstream: “fastcgi://127.0.0.1:9000”, host: “server1.cyberciti.biz”
How do I fix this problem on Alpine Linux or Unix operating systems?
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How to find out why squid proxy exited due to signal 9 with status 0

I am getting an error that read as “The proxy server is refusing connections.” I am using Squid 3 with Ubuntu Linux 16.04 LTS server and how can I find out why my squid proxy server died unexpectedly?
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Error while loading shared libraries: libXrender.so.1 on Linux

I am trying to use wkhtmltopdf command to create and convert html pages to a pdf. However, I am running into errors though as follows when try to use wkhtmltopdf via a shell or Python script:
     Creating foo.pdf …
     ~/bin/wkhtmltox/bin/wkhtmltopdf: error while loading shared libraries: libXrender.so.1: cannot open shared object file: No such file or directory
     Error: foo.pdf not found.

How do I fix this problem with out installing the xserver on my Ubuntu or Debian server?
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Linux / Unix: “-bash: python: command not found” error and solution

I am a new user and trying to run Python program. I have a cloud based VM/VPS and when I type python mycode.py at the terminal of my server, I get the following error:
-bash: python: command not found

How do I solve this problem?
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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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Ubuntu 16.04 Create a cron.log File To Log crontab Logs

I am a new Ubuntu Linux 16.04 user. How do I verify that my cron job is executing? I am unable to find /var/log/cron.log file. Where is the cron log file on Ubuntu 16.04 LTS server?
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How to install htop on pfSense firewall

I am using pfSense version 2.3.2-RELEASE (FreeBSD 10.3-RELEASE-p5). How do I install htop version 2.x on a pfSense firewall?
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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 sudo: add-apt-repository: command not found error and solution

I‘m trying to run a command ‘sudo add-apt-repository ppa:foo/bar‘ but getting the following error:

     sudo: add-apt-repository: command not found

How do I fix this problem on Ubuntu Linux 14.04 LTS server?
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