Top Tips, Part 49

Two things I keep forgetting:

• If you've got an account with a shell like "/sbin/nologin", and you want to run su but you keep getting "This account is currently not available", you can run su like so:

su -s /bin/bash -c [command] [userid]

• You can get Linux to drop its NFS caches (technically, pagecache + dentries + inodes) like so:

echo 3 > /proc/sys/vm/drop_caches

Thanks to the good folks at Server Fault/Stack Overflow.