man > fincore(1)

📛 NAME

fincore - count pages of file contents in core

🚀 Quick Reference

Use Case	Command	Description
Check if file pages are in memory	fincore /path/to/file	📊 Report resident pages for one or more files
Display sizes in bytes	fincore -b /path/to/file	📏 Show SIZE column in bytes instead of human-readable
Output in JSON format	fincore -J /path/to/file	📄 Get structured machine-readable output
Customize output columns	fincore -o +list /path/to/file	🎯 Add or select specific columns (e.g., +PID, +MODE)
Hide header line	fincore -n /path/to/file	🔇 Suppress column headers for scripting

📋 SYNOPSIS

fincore [options] file...

📖 DESCRIPTION

fincore counts pages of file contents being resident in memory (in core), and reports the numbers. If an error occurs during counting, then an error message is printed to the stderr and fincore continues processing the rest of files listed in a command line.

⚠️ The default output is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns by using --output columns-list in environments where a stable output is required.

⚙️ OPTIONS

• -n, --noheadings 🔇 Do not print a header line in status output.
• -b, --bytes 📏 Print the SIZE column in bytes rather than in a human-readable format.
• -o, --output list 🎯 Define output columns. See the --help output to get a list of the currently supported columns. The default list of columns may be extended if list is specified in the format +list.
• -r, --raw 🗜️ Produce output in raw format. All potentially unsafe characters are hex-escaped (\x<code>).
• -J, --json 📄 Use JSON output format.
• -V, --version ℹ️ Display version information and exit.
• -h, --help ❓ Display help text and exit.

👥 AUTHORS

Masatake YAMATO <yamato AT redhat.com>

🔗 SEE ALSO

mincore(2), getpagesize(2), getconf(1p)

🐛 REPORTING BUGS

For bug reports, use the issue tracker at https://github.com/karelzak/util-linux/issues.

📦 AVAILABILITY

The fincore command is part of the util-linux package which can be downloaded from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-linux/>.

util-linux 2.37.2 (2021-06-02)