fincore
page cache inspector for files
TLDR
Display cache details for a file
$ fincore [path/to/file]
Display all possible data columns$ fincore --output-all [path/to/file]
Display help$ fincore [-h|--help]
SYNOPSIS
fincore [options] files
DESCRIPTION
fincore displays how much of a file is currently cached in memory by the kernel's page cache. It shows the number of pages and bytes cached.
Useful for understanding memory usage and cache behavior.
PARAMETERS
--output-all
Show all available columns-o, --output list
Specify output columns-h, --help
Display help--bytes
Show sizes in bytes
CAVEATS
Part of util-linux. Shows point-in-time snapshot of cache state. Cache contents change dynamically based on system activity.