https://linuxeries.org/tags/troubleshooting/ Recent content in Troubleshooting on ShieldedBytes Hugo en Sat, 16 May 2026 08:11:30 +0200 https://linuxeries.org/post/2026-05-16-troubleshooting-permission-issues-with-defaul/ Sat, 16 May 2026 08:11:30 +0200 https://linuxeries.org/post/2026-05-16-troubleshooting-permission-issues-with-defaul/ <h2 id="introduction-to-umask-and-acls">Introduction to Umask and ACLs</h2> <p>When working with shared directories in Linux, I&rsquo;ve seen permission issues arise due to the default umask and Access Control Lists (ACLs). The real trick is understanding how these two settings interact. The umask is a 3-digit octal number that determines the default permissions for newly created files and directories, while ACLs provide a more fine-grained access control mechanism.</p> <h2 id="understanding-umask">Understanding Umask</h2> <p>The umask is subtracted from the maximum possible permissions (777 for directories and 666 for files) to determine the default permissions. For example, a umask of 022 would result in default permissions of 755 for directories (777 - 022 = 755) and 644 for files (666 - 022 = 644). To view the current umask, you can use the <code>umask</code> command:</p>