Exploring Your System

uname uname -r uname -s bash —version Basic - Command Line Interface

🔹 uname

What it does:
uname stands for Unix Name, and it displays basic information about the system.

Default behavior:
Running uname with no options typically returns the kernel name (e.g., Linux).

$ uname
Linux

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🔹 uname -r

What it does:
Prints the kernel release version.

Example:

$ uname -r
3.10.0-1160.el7.x86_64

This indicates the specific version of the Linux kernel currently running (common in CentOS 7).

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🔹 uname -s

What it does:
Prints the kernel name, same as running uname without options.

Example:

$ uname -s
Linux

So:

• -s = kernel name (e.g., Linux)

• -r = kernel release (e.g., 3.10.0-1160.el7.x86_64)

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🔹 bash --version

What it does:
Displays the version information of the currently installed GNU Bash shell.

Example:

$ bash --version
GNU bash, version 4.2.46(2)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2011 Free Software Foundation, Inc.

This shows the Bash version (4.2.46 in this example), which is useful for checking compatibility with scripts.

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✅ Summary Table

Command	Description	Example Output
uname	Kernel name	Linux
uname -r	Kernel release/version	3.10.0-1160.el7.x86_64
uname -s	Kernel name	Linux
bash --version	Bash shell version info	GNU bash, version 4.2.46