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+# dontneed: tell linux you don't need some files in RAM cache
+
+Maybe used to prevent swapping about files you write but don't read, like somedump.sql.gz on somelog.1.gz.
+
+    Usage: ./dontneed <path>...
+     Calls posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED) on each <path>
+    
+     Tip: you may find all cached files from rootfs with the costly one-liner:
+     # find / -mount -type f -print0 | xargs -r0 fincore | grep -vE '^ *0B' | sort -hr | uniq | less