01-14-2007
Probably not. It will depend to some extent on how you resolve hostnames. If you resolve locally, or the DNS server has not been updated, then telnet will still work, even if the host name has changed.
I don't think you will have a problem though, unless the system does not complete a normal reboot. Even then (if you have a hang or crash) you will probably get away with it.
I presume you didn't down or detach any ethernet interfaces, so the change never went into effect and the next time the system boots it will re-read the original hostname, so all should be OK.
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UNAME(3) BSD Library Functions Manual UNAME(3)
NAME
uname -- get system identification
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/utsname.h>
int
uname(struct utsname *name);
DESCRIPTION
The uname() function stores nul-terminated strings of information identifying the current system into the structure referenced by name.
The utsname structure is defined in the <sys/utsname.h> header file, and contains the following members:
sysname Name of the operating system implementation.
nodename Network name of this machine.
release Release level of the operating system.
version Version level of the operating system.
machine Machine hardware platform.
RETURN VALUES
The uname() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The uname() function may fail and set errno for any of the errors specified for the library functions sysctl(3).
SEE ALSO
uname(1), sysctl(3)
STANDARDS
The uname() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
HISTORY
The uname() function first appeared in 4.4BSD.
BSD
January 4, 1994 BSD