/usr/lib/radare/bin/search-asm is in radare-common 1:1.5.2-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
#
# Thanks sha0 for the idea
#
# --pancake
#
# > .!rsc search-asm 'jmp *%eax'
#
printf "/x "
eval "rsc asm '$1'"
echo
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