There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "let's use getfacl to see if we have any Access Control Lists already set on the acl_demo.txt file."

A block of code is set as follows:

   [base]
        name=CentOS-$releasever - Base
        mirrorlist=http://mirrorlist.centos.org/?
        release=$releasever&arch=$basearch&repo=os&infra=$infra
          #baseurl=http://mirror.centos.org/centos/
           $releasever/os/$basearch/
        gpgcheck=1
        gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
        priority=1

Any command-line input or output is written as follows:

[donnie@localhost ~]$ tar cJvf new_perm_dir_backup.tar.xz new_perm_dir/ --acls
new_perm_dir/
new_perm_dir/new_file.txt
[donnie@localhost ~]$

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Click the Network menu item, and change the Attached to setting from NAT to Bridged Adapter."