Ignore the stray `, correct command line is: WINEDEBUG=fps wine MYAPP.exe 2>&1 | tee /dev/stderr | grep --line-buffered "^trace:fps:" | osd_cat
Ignore the stray `, correct command line is: WINEDEBUG=fps wine MYAPP.exe 2>&1 | tee /dev/stderr | grep --line-buffered "^trace:fps:" | osd_cat