I want to count how many times a certain sequence of bytes happens inside a file that I have. For example, I want to find out how many times the number \0xdeadbeef occurs inside an executable file. Right now I am doing that using grep:

#/usr/bin/fish
grep -c \Xef\Xbe\Xad\Xde my_executable_file

(The bytes are written in reverse order because my CPU is little-endian)

However, I have two problems with my approach:

• Those \Xnn escape sequences only work in the fish shell.
• grep is actually counting the number of lines that contain my magic number. If the pattern occurs twice in the same line it will only count once.

Is there a way to fix these problems? How can I make this one liner run in Bash shell and accurately count number of times the pattern occurs inside the file?