free - source code and man page are discrepant
Fedora FC37, procps-3.3.17. manpage states:
free Unused memory (MemFree and SwapFree in /proc/meminfo)
However the code reports Memfree value with no access to Swapfree
shared Memory used (mostly) by tmpfs (Shmem in /proc/meminfo)
'shared' reports the /proc/meminfo:Shmem value, which appears vastly larger than tmpfs, devtmpfs an zram altogether.