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Manually Setting Initial Information Customizing System-Wide and User Login Environments
Setting
the System Clock | |
Only the superuser (root) can change the system clock. The system clock budgets
process time and tracks file access. Potential
Problems When Changing the System ClockThe following are potential problems you can cause by changing
the system clock: The make program is sensitive to a file’s time and date
information and to the current value of the system clock. Setting
the clock forward will have no effect, but setting the clock backward
by even a small amount may cause make to behave unpredictably. Incremental backups heavily depend on a correct
date because the backups rely on a dated file. If the date is not
correct, an incorrect version of a file can be backed up. Altering the system clock can cause unexpected results
for jobs scheduled by /usr/sbin/cron: If you set the time back, cron does not run any jobs until the clock catches
up to the point from which it was set back. For example, if you
set the clock back from 8:00 to 7:30, cron will not run any jobs until the clock again reaches
8:00. If you set the clock ahead, cron attempts to catch up by immediately starting all
jobs scheduled to run between the old time and the new. For example,
if you set the clock ahead from 9:00 to 10:00, cron immediately starts all jobs scheduled to run between
9:00 and 10:00.
Setting
the Time and Date /sbin/set_parms sets your time and date upon booting. See “Manually Setting Initial Information ”. If you have to reset the time
or date, you can use SAM or HP-UX commands. | | | |  | CAUTION: Changing the date while the system is running in
multiuser mode may disrupt user-scheduled and time-sensitive programs
and processes. Changing the date may cause make(1), cron(1M),
and the Source Control subsystems SCCS, sccs(1), and RCS, rcs(1) to
behave in unexpected ways. Additionally, any Hewlett-Packard or
third-party supplied programs that access the system time, or file
timestamps stored in the file system, may behave in unexpected ways
after changing the date. Setting the date back is not
recommended. If changes were made to files in SCCS file
format while the clock was not set correctly, check the modified
files with the val command. See val(1) for details. See “Potential
Problems When Changing the System Clock” for more information. | | | | |
| | | |  | NOTE: Hewlett-Packard strongly recommends that you use single-user
mode when changing the system clock. Therefore, warn users of a
planned system shutdown. See “Shutting Down Systems” for details on system shutdown. | | | | |
To use HP-UX commands, follow these steps: Manually Setting Initial Information | |
Use this section only if you need to add or modify system
parameter information. Any modifications should be made as soon
as possible after the initial installation. /sbin/set_parms is automatically run when you first boot the system. To
enter the appropriate set_parms dialog screen to manually add or modify information after
booting, log in as superuser and specify option is one of the keywords in Table 3-5 “set_parms Options ”. You will be prompted for the appropriate data. Table 3-5 set_parms Options option | Description |
|---|
hostname | Your unique system name. This host name
must be eight or fewer characters long, contain only alphabetic
characters, numbers, underscores, or dashes, and must start with
an alphabetic character. | ip_address | Internet protocol address. If networking
is installed, this is an address with four numeric components, each
of which is separated by a period with each number between 0 and
255. An example of an IP address is: 255.32.3.10. If you do not
have networking installed, you will not be prompted for the IP address. | timezone | The time zone where your system is located. | addl_netwrk | Additional network parameters. These
allow you to configure additional network parameters, such as the
subnetwork mask, network gateway, network gateway IP address, local
domain name, Domain Name System (DNS) server host name, DNS server IP
address and Network Information Service domain name. | font_c-s | Network font service. This allows you
to configure your workstation to be a font client or server. As
a font client, your workstation uses the font files on a network
server rather than using the fonts on its own hard disk, thus saving
disk space. System RAM usage is reduced for font clients, but increased
for font servers. |
Changes you make using set_parms will take effect after you reboot the system. See “Booting Systems”. Customizing System-Wide and User Login Environments | |
Defaults for system-wide variables, such as time-zone setting,
terminal type, search path, and mail and news notification, can
be set in /etc/profile for Korn and POSIX shell users and in /etc/csh.login for C shell users. User login scripts can be used to override the system defaults.
When SAM adds a user, default user login scripts are copied to the
user’s home directory. For Korn and POSIX shell users /etc/skel/.profile is copied to $HOME as .profile. For C shell users, /etc/skel/.login and /etc/skel/.cshrc are copied to $HOME as .login and .cshrc. Refer to Shells: User’s Guide and Technical
Addendum to the Shells: User’s Guide for information
on customizing user login scripts. | | | | | NOTE: Do a full backup once you have initially set up and
customized your system. This allows you to reconstruct your system — kernel,
system files, file system structure, user structures, and your customized
files — if you need to. Use SAM or HP-UX commands to perform
the backup, as described in “Backing Up Data”. | | | | |
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