Appendix B. Understanding the /etc Files

A directory named /etc exists within the integrated ®le system namespace. This directory contains important system ®les that users should never write to or change unless they are experienced NFS administrators. NFS uses these ®les to perform speci®c system functions. The following ®les are located in the/etc directory:

 

v

/etc/exports

 

v

/etc/netgroup

v

/etc/rpcbtab

 

v

/stc/statd

Whenever you use the export command, the command searches for the

/etc/exports and /etc/netgroup ®les. If they do not exist, the system creates these

®les by using characters from the ASCII default code page of the system. When the

system creates these ®les, they will contain introductory help information. If you

update these ®les at any time, you must use the export command (with the '-A'

option) to make your exports current.

 

 

 

Editing ®les within the /etc directory

The ®les stored within the/etcdirectory are stream ®les. You can edit them in the

following ways:

1. Edit using the Edit File (EDTF) command

2. Edit using a PC based editor

3. Edit using a UNIX editor via NFS

Editing stream ®les by using the Edit File (EDTF) command

The Edit File (EDTF) command allows you to edit stream ®les or database ®les. By

default, this command is not part of the base operating system. A Program

Temporary Fix (PTF) provides the command. The PTF in V3R7 is SF38832. Refer

to the cover letter of the PTF for instructions on how to install the commands it

contains. Once you have installed the PTF, you can edit the desired ®le by

specifying the absolute or relative path name.

The difference between the absolute and the relative path name is the ″/″ at the

beginning of the path name. The ″/″ as the ®rst character signi®es an absolute path

name. Absolute path names start from the root directory every time. Relative path

names start from the current directory. For example:

Absolute Path Name

EDTF STMF(©/etc/exports©)

This command edits the stream ®leexports within the directory /etc.

EDTF FILE(PGMLIB/ACCOUNT) MBR(ACC1)

This command edits the ®le memberACC1 within the physical ®lePGMLIB/ACCOUNT.

Relative Path Name

EDTF STMF(©exports©)

This command edits the ®leexports within the current directory.

© Copyright IBM Corp. 1997, 1999

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IBM AS/400E manual Appendix B. Understanding the /etc Files, Editing les within the /etc directory, Absolute Path Name
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AS/400E specifications

The IBM AS/400E, now more commonly known as IBM i, is a robust and versatile midrange server that has been designed to provide a comprehensive computing solution for businesses of all sizes. First introduced in the late 1980s, the AS/400 series has undergone multiple enhancements and rebranding, with the AS/400E being one of the notable iterations. This powerful platform is closely associated with IBM's commitment to reliability, scalability, and integrated business solutions.

One of the main features of the AS/400E is its highly integrated architecture that combines hardware and software into a cohesive system. This integration allows for seamless operations, reducing the complexity typically associated with managing disparate systems. The system is powered by IBM's proprietary OS/400 operating system, which has evolved into IBM i, featuring advanced capabilities like object-oriented programming, integrated database management, and security features that are essential for enterprise environments.

A key characteristic of the AS/400E is its robust database support, primarily through the use of DB2 for i. This integrated database management system enables efficient data handling and retrieval, facilitating real-time business analytics and reporting. Furthermore, the platform supports a variety of programming languages, including RPG, COBOL, and Java, making it flexible for developers who require diverse tools for application development.

The AS/400E is also known for its exceptional reliability and uptime, making it a preferred choice for critical business applications in industries such as finance, healthcare, and manufacturing. This reliability is backed by advanced error detection and correction mechanisms, as well as redundancy features that help prevent data loss and minimize downtime.

In terms of scalability, the AS/400E can effortlessly expand to accommodate growing business demands. Organizations can increase processing power by adding more resources without significant disruption. This scalability, combined with the system’s built-in virtualization capabilities, allows businesses to optimize resource usage and streamline operations.

Security is another defining feature of the AS/400E. The platform incorporates various layers of security measures, including user authentication, encryption, and comprehensive auditing capabilities, ensuring that sensitive business data is protected against unauthorized access.

Overall, the IBM AS/400E remains a powerful tool in the enterprise computing landscape, providing businesses with an integrated, reliable, and secure solution for their technological needs. Its enduring popularity is a testament to its capability to evolve with changing business requirements while maintaining its core attributes of high performance and stability.
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