The getconf command is a command-line tool in Linux and UNIX-like operating systems that is used to query system configuration variables. The getconf command can be used to retrieve information about the system’s hardware and software configuration, such as the maximum number of open files, the page size, and the path name delimiter.

Here are a few examples of how to use the getconf command:

1. Display the system’s maximum number of open files:

getconf OPEN_MAX

2. Display the system’s page size:

getconf PAGESIZE

3. Display the system’s path name delimiter:

getconf PATH_MAX

4. Display the system’s largest file size:

getconf FILESIZEBITS

5. Display the system’s maximum number of simultaneous processes:

getconf CHILD_MAX

6. Display the system’s supported clock real-time:

getconf CLK_TCK

getconf is similar to other command like sysctl and ulimit that allow to query system-wide resource limits and kernel parameters. However, getconf focuses on showing values that cannot be modified as well as standard system-level limits defined by POSIX standard.

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230. Linux Commands and Examples