Tag: unix

Total 18 Posts

Symbolic Links in Unix/Linux

Different file systems in the UNIX/Linux universe allow a variety of entries such as regular files, directories, sockets, named pipes, and links. In this article I will explain to you what links are, which types of links exist, how to create a symbolic link, and how to detect broken

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Array Loops in Bash

In this article we'll show you the various methods of looping through arrays in Bash. Array loops are so common in programming that you'll almost always need to use them in any significant programming you do. To help with this, you should learn and understand the various types of arrays

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Zsh vs Bash

When we talk about UNIX based programming, it's usually about the shells, terminals, and the command line interfaces. The most prevalent shell in this regard is Bash but there are other variants available and used widely as well, like Zsh or the Z shell.

In this article, we'll attempt to

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Substrings in Bash

Throughout your programming career you'll find that there are quite a few times you need to extract a substring from another string. Strings are one of the most common data structures, so this comes up often. I bet you could tell me how to do it in your favorite programming

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How to Fix "WARNING: UNPROTECTED PRIVATE KEY FILE!" on Mac and Linux

Have you run in to the warning message below, and don't know how to fix it?

Warning: Permanently added '192.168.1.1' (RSA) to the list of known hosts.
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@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 for '/path/to/my/key.pem' are too open.
It is required
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