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Top Forums UNIX for Dummies Questions & Answers ksh to check second time difference between two servers Post 302814163 by Don Cragun on Tuesday 28th of May 2013 09:46:14 PM
Old 05-28-2013
Although it is not specified by the POSIX standards and the Single UNIX Specifications, many implementations of the date utility provide a %s format conversion specification that will return Seconds since the Epoch. (i.e., the command:
Code:
date +%s

will return the number of seconds since midnight on the morning of January 1, 1970 GMT.) This is a nice value to use for something like this since it is immune to timezone differences and is not affected by shifts to and from daylight savings time.

Another thing not specified by those standards is the network time protocol daemon. Look for an ntpd man page on your servers. If the man page is present ask your sys admins to be sure it is running on those servers.
 

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SSH-COPY-ID(1)						    BSD General Commands Manual 					    SSH-COPY-ID(1)

NAME
ssh-copy-id -- copy public keys to a remote host SYNOPSIS
ssh-copy-id [-lv] [-i keyfile] [-o option] [-p port] [user@]hostname DESCRIPTION
The ssh-copy-id utility copies public keys to a remote host's ~/.ssh/authorized_keys file (creating the file and directory, if required). The following options are available: -i file Copy the public key contained in file. This option can be specified multiple times and can be combined with the -l option. If a private key is specified and a public key is found then the public key will be used. -l Copy the keys currently held by ssh-agent(1). This is the default if the -i option was not specified. -o ssh-option Pass this option directly to ssh(1). This option can be specified multiple times. -p port Connect to the specified port on the remote host instead of the default. -v Pass -v to ssh(1). The remaining arguments are a list of remote hosts to connect to, each one optionally qualified by a user name. EXIT STATUS
The ssh-copy-id utility exits 0 on success, and >0 if an error occurs. EXAMPLES
To send a specific key to multiple hosts: $ ssh-copy-id -i /path/to/keyfile.pub user@host1 user@host2 user@host3 HISTORY
The ssh-copy-id utility was written by Eitan Adler <eadler@FreeBSD.org> as a drop-in replacement for an existing utility included with OpenSSH. BSD
February 28, 2014 BSD
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