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findmnt:tldr:47551
The command "findmnt -t ${ext4}" is used to find and display information about mounted file systems that use the "ext4" file system type.
Here's a breakdown of the command:
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"findmnt" is the command itself. It is used to find and display mount points and other information about mounted file systems on a Linux system.
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"-t" is an option that allows you to specify the file system type you want to search for. In this case, the file system type is specified as "${ext4}". The use of "${ext4}" implies that the value of the variable "ext4" is substituted in place of "${ext4}".
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"${ext4}" is a variable representing the file system type. It could be defined earlier in the script or environment with a value of "ext4". The actual file system type being searched for is "ext4", a common file system used in Linux for storing data.
By running this command, you will get a list of mounted file systems that have the "ext4" file system type, along with other details such as mount point, device, and options.