Answer by Ole Tange for List the files accessed by a program

I gave up and coded my own tool. To quote from its docs:

SYNOPSIS    tracefile [-adefnu] command    tracefile [-adefnu] -p pidOPTIONS    -a        List all files    -d        List only dirs    -e        List only existing files    -f        List only files    -n        List only non-existing files    -p pid    Trace process id    -u        List only files once

It only outputs the files so you do not need to deal with the output from strace.

https://codeberg.org/tange/tangetools/src/branch/master/tracefile