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The error message is: $ git clone https://github.com/ansible/ansible.git . Cloning into ‘.’… error: SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed while accessing https://github.com/ansible/ansible.git/info/refs?service=git-upload-pack fatal: HTTP request failed There are basically two solutions,…

The error code of rsync is similar to UNIX/Linux system error code, and it has different meanings which makes it confusing. How can we understand the meanings of error code of rsync? Well, rsync’s manual page explains this well, and you…

The key thing is to log the cookie in a file, this can be done with parameter cookie-jar, below is an example, curl -d "user=test&pass=111111&ip=192.168.1.1&type=2&type=1&action=%C1%AC%BD%D3%CD%F8%C2%E7" –cookie-jar fee.cookie example.com/login.jsp In order to use the cookie, we can command below to read and…

Plain text files are easier to copy/paste and share compared to other types of files. How can we convert any non-plain text files like pictures, binary files, compressed files, etc to plain text? Well, with the help of  vim, it’s quite…

You sometimes need to do plain text processing, and you might need to remove empty lines from a file. As for “empty lines” here we mentioned are the lines that don’t contain either space or table. For example, if you…

By default, PPTP VPN is running on port 1723, how can I change default service port for PPTP VPN as it’s not supported by its configuration file? To change port for PPTP VPN, we need to follow unusual ways. Here we will…

WARNING: RunAsUser for MSP ignored, check group ids (egid=0, want=51) can not chdir(/var/spool/clientmqueue/): Permission denied Program mode requires special privileges, e.g., root or TrustedUser. I’m running Redhat Enterprise Linux, and this warning appears when I tried to send out emails…