PuTTY displaying "special" characters


 
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Old 05-01-2013
Quote:
Originally Posted by hanson44
Yes, it is. Smilie cat -v is really great.
Personally, I wouldn't go that far. Its output is ambiguous, e.g. ^X can represent a control character or two literal characters. If you really, really want to know what you're looking at, vis is a better choice (or od, hexdump, etc).

Also, due to its ambiguous nature, cat -v is a one way conversion. vis has the advantage of being revertable, allowing one to pipe data with problematic bytes through utilities which expect a text file, work with the data, then revert back to the original unencoded form (modulo any edits).

Yes, I'm aware that I'm being nitpicky Smilie. I'm sure cat -v is good enough most of the time.

Regards,
Alister
 
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REVOKE(2)						      BSD System Calls Manual							 REVOKE(2)

NAME
revoke -- revoke file access SYNOPSIS
#include <unistd.h> int revoke(const char *path); DESCRIPTION
The revoke function invalidates all current open file descriptors in the system for the file named by path. Subsequent operations on any such descriptors fail, with the exceptions that a read() from a character device file which has been revoked returns a count of zero (end of file), and a close() call will succeed. If the file is a special file for a device which is open, the device close function is called as if all open references to the file had been closed. Access to a file may be revoked only by its owner or the super user. The revoke function is currently supported only for block and character special device files. It is normally used to prepare a terminal device for a new login session, preventing any access by a previous user of the terminal. RETURN VALUES
A 0 value indicated that the call succeeded. A -1 return value indicates an error occurred and errno is set to indicated the reason. ERRORS
Access to the named file is revoked unless one of the following: [ENOTDIR] A component of the path prefix is not a directory. [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an entire path name exceeded 1024 characters. [ENOENT] The named file or a component of the path name does not exist. [EACCES] Search permission is denied for a component of the path prefix. [ELOOP] Too many symbolic links were encountered in translating the pathname. [EFAULT] Path points outside the process's allocated address space. [EINVAL] The named file is neither a character special or block special file. [EPERM] The caller is neither the owner of the file nor the super user. SEE ALSO
close(2) HISTORY
The revoke function was introduced in 4.3BSD-Reno. BSD
June 4, 1993 BSD