how to check whether given numbe ris hex or not

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LEARN ABOUT DEBIAN

authbind-helper

AUTHBIND-HELPER(8)						Debian Linux manual						AUTHBIND-HELPER(8)

NAME

       authbind-helper - helper program to bind sockets to privileged ports without root

SYNOPSIS

       /usr/lib/authbind/helper addr4-hex port-hex <socket
       /usr/lib/authbind/helper addr6-hex port-hex 6 <socket

DESCRIPTION

       helper  is  the	program used by libauthbind, which is in turn used by authbind to allow programs which do not or should not run as root to
       bind to low-numbered ports in a controlled way.	See authbind(1).

       It may also be used standalone, i.e. without assistance from authbind.  Its standard input should be a TCP/IP  socket,  and  it	should	be
       passed two or three arguments.

       The  arguments  are the address and port number, respectively, to which the caller desires that the socket be bound, and the address family
       (ommitted for IPv4; the fixed string 6 for IPv6).  addr4-hex and port-hex should be hex strings, without leading 0x, of exactly	the  right
       length  (8  and 4 digits, respectively), being a pair of hex digits for each byte in the address or port number when expressed in host byte
       order.  For example, the port argument is the result of something like sprintf(arg, "%04X", sin.sin_port).  addr6-hex should be a string of
       32 hex digits, being a pair for each byte in the address, in network byte order.

EXIT STATUS

       helper will exit with code 0 on success.

       If possible, helper will return an appropriate errno value as its exit status.  If this is not possible it may exit with status 255 or with
       an exit status corresponding to ENOSYS (Function not implemented).

ACCESS CONTROL

       See authbind(1) for details of the access control regime implemented by helper.

SEE ALSO

       authbind(1), bind(2)

AUTHOR

       authbind and this manpage were written by Ian Jackson.  They are Copyright (C)1998,2012 by him and released under the  GNU  General  Public
       Licence; there is NO WARRANTY.  See /usr/doc/authbind/copyright and /usr/doc/copyright/GPL for details.

Debian Project							 30th August 1998						AUTHBIND-HELPER(8)

Programming