# update-leap(1) - man - phpMan

UPDATE_LEAP(1update-leapmdoc)        User        UPDATE_LEAP(1update-leapmdoc)

## NAME
     **update-leap** — leap-seconds file manager/updater

## SYNOPSIS
     **update-leap** [**-flags**] [**-flag** [_value_]] [**--option-name**[[=| ]_value_]]

                 All arguments must be options.

## DESCRIPTION
     **update-leap** will validate the file currently on the local system and if necessary, updates
     leap-second definition file.

     Ordinarily, the file is found using the "leapfile" directive in [ntp.conf(5)](https://www.chedong.com/phpMan.php/man/ntp.conf/5/markdown).  However, an al‐
     ternate location can be specified on the command line.

     If the file does not exist, is not valid, has expired, or is expiring soon, a new copy will be
     downloaded.  If the new copy validates, it is installed and NTP is (optionally) restarted.

     If the current file is acceptable, no download or restart occurs.

     -c can also be used to invoke another script to perform administrative functions, e.g. to copy
     the file to other local systems.  This can be run as a cron job.  As the file is rarely up‐
     dated, and leap seconds are announced at least one month in advance (usually longer), it need
     not be run more frequently than about once every three weeks.  For cron-friendly behavior, de‐
     fine CRONJOB=1 in the crontab.  This script depends on$REQUIREDCMDS

## OPTIONS
### -s --source-url
             The URL of the master copy of the leapseconds file.

             Specify the URL of the master copy to download $LEAPSRC

### -4 --ipv4
             Use only IPv4 addresses for DNS name resolution.  This option must not appear in combi‐
             nation with any of the following options: ipv6.

                     Force DNS resolution of following host names on the command line
                     to the IPv4 namespace.
                     _EndOfDoc_; };

             flag = {
                 name      = ipv6;
                 flags-cant = ipv4, prefer;
                 value     = 6;
                 descrip   = "Use only IPv6 addresses for DNS name resolution";
                 doc = <<-  _EndOfDoc_
                     Force DNS resolution of following host names on the command line
                     to the IPv6 namespace.
                     _EndOfDoc_; };

             flag = {
                 name        = prefer;
                 flags-cant = ipv4, ipv6;
                 value = p;
                 arg-type    = keyword;
                 keyword    = 4, 6;
                 descrip     = 'Prefer IPv4 or IPv6 (as specified) addresses, but use either';
                 doc         = <<-  _EndOfDoc_ Prefer IPv4 or IPv6 (as specified) addresses, but use
             either.

### -d --destination
             Filename on the local system.

             The name to use to store the leapfile on the local system.  $LEAPFILE

### -e --expiration
             Refresh the leapfile this long before it expires.

             Specify how long before expiration the file is to be refreshed Units are required, e.g.
             "-e 60 days"  Note that larger values imply more frequent refreshes.  "$PREFETCH"

### -f --ntp-conf-file
             Location of the ntp.conf file.

             Specify location of ntp.conf (used to make sure leapfile directive is present and to
             default  leapfile) /etc/ntp.conf

### -F --force-update
             Force update of the leapfile.

             Force update even if current file is OK and not close to expiring.

### --dont-wait
             Don't wait for keystroke between plots.


     **-?**, **--help**
             Display usage information and exit.

     **-!**, **--more-help**
             Pass the extended usage information through a pager.

### -v --version
             Output version of program and exit.  The default mode is `v', a simple version.  The
             `c' mode will print copyright information and `n' will print the full copyright notice.

## USAGE
     Usage stuff

## EXIT STATUS
     One of the following exit values will be returned:

     0  (EXIT_SUCCESS)
             Successful program execution.

     1  (EXIT_FAILURE)
             The operation failed or the command syntax was not valid.

     70  (EX_SOFTWARE)
             libopts had an internal operational error.  Please report it to auto‐
             <gen-users@lists.sourceforge.net>.  Thank you.

## AUTHORS
     Timothe Litt

## NOTES
     This manual page was _AutoGen_-erated from the **update-leap** option definitions.

BSD                              June 23 2020                              BSD