+//usage:#define head_trivial_usage
+//usage: "[OPTIONS] [FILE]..."
+//usage:#define head_full_usage "\n\n"
+//usage: "Print first 10 lines of each FILE (or stdin) to stdout.\n"
+//usage: "With more than one FILE, precede each with a filename header.\n"
+//usage: "\n -n N[kbm] Print first N lines"
+//usage: IF_FEATURE_FANCY_HEAD(
+//usage: "\n -n -N[kbm] Print all except N last lines"
+//usage: "\n -c [-]N[kbm] Print first N bytes"
+//usage: "\n -q Never print headers"
+//usage: "\n -v Always print headers"
+//usage: )
+//usage: "\n"
+//usage: "\nN may be suffixed by k (x1024), b (x512), or m (x1024^2)."
+//usage:
+//usage:#define head_example_usage
+//usage: "$ head -n 2 /etc/passwd\n"
+//usage: "root:x:0:0:root:/root:/bin/bash\n"
+//usage: "daemon:x:1:1:daemon:/usr/sbin:/bin/sh\n"
+