10-06-2017
By definition, UNIX text utility tools work on text files, and text fiies do not contain NUL bytes. Some text utilities on some operating systems can handle NUL bytes even though doing so is not required by the standards. But, of course, you haven't bothered to tell us what operating system you're using.
Are there always three NUL bytes that you want to remove? Or, does the number of NUL bytes vary? If the number varies, you can use something like od to determine the number of leading NUL bytes and then you can use dd to skip over those bytes and copy the rest of the data in the file to another file.
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LEARN ABOUT DEBIAN
copyout
COPY(9) BSD Kernel Developer's Manual COPY(9)
NAME
copy, copyin, copyout, copystr, copyinstr -- kernel copy functions
SYNOPSIS
#include <sys/types.h>
#include <sys/systm.h>
int
copyin(const void *uaddr, void *kaddr, size_t len);
int
copyout(const void *kaddr, void *uaddr, size_t len);
int
copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *done);
int
copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done);
DESCRIPTION
The copy functions are designed to copy contiguous data from one address to another. All but copystr() copy data from user-space to kernel-
space or vice-versa.
The copy routines provide the following functionality:
copyin() Copies len bytes of data from the user-space address uaddr to the kernel-space address kaddr.
copyout() Copies len bytes of data from the kernel-space address kaddr to the user-space address uaddr.
copystr() Copies a NUL-terminated string, at most len bytes long, from kernel-space address kfaddr to kernel-space address kdaddr. The
number of bytes actually copied, including the terminating NUL, is returned in *done (if done is non-NULL).
copyinstr() Copies a NUL-terminated string, at most len bytes long, from user-space address uaddr to kernel-space address kaddr. The num-
ber of bytes actually copied, including the terminating NUL, is returned in *done (if done is non-NULL).
RETURN VALUES
The copy functions return 0 on success or EFAULT if a bad address is encountered. In addition, the copystr(), and copyinstr() functions
return ENAMETOOLONG if the string is longer than len bytes.
SEE ALSO
fetch(9), store(9)
BSD
January 7, 1996 BSD