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Full Discussion: Substitute a character with sed
Top Forums UNIX for Beginners Questions & Answers Substitute a character with sed Post 303032326 by jim mcnamara on Friday 15th of March 2019 09:06:43 AM
Old 03-15-2019
Speaking strictly as a scientist: python ruby, and julia are extremely important for research and analysis.

GNU supports the environment variable POSIXLY_CORRECT. This helps a lot when you are porting code back and forth between several platforms. I would suggest that you check it out. Defining it changes behavior to be pretty close to POSIX. Not perfect, IMO.

Linux is effectively inescapable in modern data centers. Even appliances like routers run on embedded Linux. So does your refrigerator ....

GNU.org position on POSIX:
GNU Coding Standards: Non-GNU Standards

Some OSes kind of go off the deep end in attempt to be a sort of "all versions of standards" - which is kind of what you are discussing here.

Solaris is an example:

Compliance with standards in that OS - for a new user or somebody porting an app - can be confusing. You get different versions of awk, tr and so on. This depends on which of several possible paths, and their order, ex: /usr/xpg4/bin versus /usr/bin, you have set up in PATH. This can break a lot of things that worked correctly on HP-UX but not Solaris, for example. I spent a lot of time tweaking the PATH variable for different applications and their associated users

XPG4 -
man pages section 5: Standards, Environments, and Macros

Don Cragun here actively works on standards, and definitely will have have some opinions here.
 

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LEARN ABOUT OPENSOLARIS

grub

grub(5) 						Standards, Environments, and Macros						   grub(5)

NAME

       grub - GRand Unified Bootloader software on Solaris

DESCRIPTION

       The  current  release  of the Solaris operating system is shipped with the GRUB (GRand Unified Bootloader) software.  GRUB is developed and
       supported by the Free Software Foundation.

       The overview for the GRUB Manual, accessible at www.gnu.org, describes GRUB:

       Briefly, a boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring  con-
       trol  to an operating system kernel software (such as Linux or GNU Mach). The kernel, in turn, initializes the rest of the operating system
       (for example, a GNU [Ed. note: or Solaris] system).

       GNU GRUB is a very powerful boot loader that can load a wide variety of free, as well as proprietary, operating systems, by means of chain-
       loading.  GRUB  is designed to address the complexity of booting a personal computer; both the program and this manual are tightly bound to
       that computer platform, although porting to other platforms may be addressed in the future. [Ed. note: Sun has ported GRUB to  the  Solaris
       operating system.]

       One  of the important features in GRUB is flexibility; GRUB understands filesystems and kernel executable formats, so you can load an arbi-
       trary operating system the way you like, without recording the physical position of your kernel on the disk. Thus you can load  the  kernel
       just by specifying its file name and the drive and partition where the kernel resides.

       Among  Solaris  machines, GRUB is supported on x86 platforms. The GRUB software that is shipped with Solaris adds two utilities not present
       in the open-source distribution:

       bootadm(1M)	  Enables you to manage the boot archive and make changes to the GRUB menu.

       installgrub(1M)	  Loads the boot program from disk.

       Both of these utilities are described in Solaris man pages.

       Beyond these two Solaris-specific utilities, the GRUB software is described in the GRUB manual, a PDF version of which  is  available  from
       the Sun web site.  Available in the same location is the grub(8) open-source man page.  This man page describes the GRUB shell.

SEE ALSO

       boot(1M), bootadm(1M), installgrub(1M)

       Solaris Express Installation Guide: Basic Installations

       System Administration Guide: Basic Administration

       http://www.gnu.org/software/grub

SunOS 5.11							    21 Apr 2005 							   grub(5)
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