问题
My web app is displaying some bizarro output (unicode characters that shouldn't be there, etc.). The best I can reckon is that somehow I introduced a bad char somewhere in the source, but I can't figure out where.
I found this answer that states I can do something like:
grep -obUaP "<\x-hex pattern>" .
When I copy the unicode char out of the browser and into my Bless hex editor, it tells me that the exact bytes of the char are:
15 03 01 EF BF BD 02 02
How can I format <\xhex pattern> to match the exact bytes that I need. I tried:
grep -obUaP "<\x-15 03 01 EF BF BD 02 02>" .
But that doesn't work. Thoughts?
回答1:
Check the post again. FrOsT is not including the '<' and '>' in his actual grep command. He only used the carats to enclose an example statement. His actual statement looks like this:
"\x01\x02"
not:
"<\x01\x02>"
I have a C source file on my computer that begins with the line:
#include <stdio.h>
When I run
grep -obUaP '\x69\x6E\x63\x6C\x75\x64\x65' io.c
I get
1:include
That is, the line number followed by only the string matching the pattern.
You may want to run
man grep
and find out what all those options mean.
来源：https://stackoverflow.com/questions/23695609/how-to-grep-for-presence-of-specific-hex-bytes-in-files