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Full Discussion: Which cut command is more efficient?
Top Forums UNIX for Advanced & Expert Users Which cut command is more efficient? Post 302507407 by Corona688 on Wednesday 23rd of March 2011 06:39:07 PM
Old 03-23-2011
Quote:
Originally Posted by methyl
For the advanced user with large data files I am not averse to using "dd" or "cpio" (or both) to read from the disc in an optimum manner.
That hardly compares to the 'cat' being run here, untuned and untunable. You're doubling the amount of work done for a <1% improvement in speed -- and with 30,000 concurrent processes, that's time something else probably could've used.
Quote:
On a single core system running ancient unix it was very important to minimise the number of concurrent processes. This is really not the case nowadays unless you happen to be running unix on a home system.
In my early shell-scripting days I wrote scripts that I'm sure would need your 36 processors to function with any efficiency Smilie Having CPU power to waste hardly makes it a good idea to do so.
 

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LEARN ABOUT SUNOS

cpio.h

cpio.h(3HEAD)							      Headers							     cpio.h(3HEAD)

NAME

       cpio.h, cpio - cpio archive values

SYNOPSIS

       #include <cpio.h>

DESCRIPTION

       Values needed by the c_mode field of the cpio archive format are described as follows:

       Name		 Description
       C_IRUSR		 Read by owner
       C_IWUSR		 Write by owner
       C_IXUSR		 Execute by owner
       C_IRGRP		 Read by group
       C_IWGRP		 Write by group
       C_IXGRP		 Execute by group
       C_IROTH		 Read by others
       C_IWOTH		 Write by others
       C_IXOTH		 Execute by others
       C_ISUID		 Set user ID
       C_ISGID		 Set group ID
       C_ISVTX		 On directories, restricted deletion flag
       C_ISDIR		 Directory
       C_ISFIFO 	 FIFO
       C_ISREG		 Regular file
       C_ISBLK		 Block special
       C_ISCHR		 Character special
       C_ISCTG		 Reserved
       C_ISLNK		 Symbolic link
       C_ISSOCK 	 Socket

       The header defines the symbolic constant:

       MAGIC	     "070707"

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pax(1), attributes(5), standards(5)

SunOS 5.10							    10 Sep 2004 						     cpio.h(3HEAD)
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