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Top Forums Shell Programming and Scripting Process output in different layout Post 302981132 by Corona688 on Wednesday 7th of September 2016 02:28:53 PM
Old 09-07-2016
There's a lot involved in splitting off processes, yes. Allocating and destroying lots of memory. Looking up paths, opening files, parsing libraries. Stopping and starting the "universe" (program context) multiple times. If you create a process, it's a good idea to let it do as much work as possible before killing it or getting in its way.

xargs isn't terribly useful here, again, it ends up creating processes so suffers the same drawback. It's nice for when you need to create processes, or can bundle multiple calls into one big call.

For high compactness, fewer externals, and the ability to handle spaces in filenames:
Code:
N=0 ; for x in * ; do printf "%d %s\n" $((++N)) "$x" ; done

To bundle it all in one enormous printf, which might be more i/o efficient:

Code:
s=""
n=0
for x in * ; do  s="$s $x $((++n))" ; done

for n in {1..10} ; do printf "%d %s\n" $s ; done


Last edited by Corona688; 09-07-2016 at 03:41 PM..
 

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wstring(3C)						   Standard C Library Functions 					       wstring(3C)

NAME
wstring, wscasecmp, wsncasecmp, wsdup, wscol - Process Code string operations SYNOPSIS
#include <widec.h> int wscasecmp(const wchar_t *s1, const wchar_t *s2); int wsncasecmp(const wchar_t *s1, const wchar_t *s2, int n); wchar_t *wsdup(const wchar_t *s); int wscol(const wchar_t *s); DESCRIPTION
These functions operate on Process Code strings terminated by wchar_t null characters. During appending or copying, these routines do not check for an overflow condition of the receiving string. In the following, s, s1, and s2 point to Process Code strings terminated by a wchar_t null. wscasecmp(), wsncasecmp() The wscasecmp() function compares its arguments, ignoring case, and returns an integer greater than, equal to, or less than 0, depending upon whether s1 is lexicographically greater than, equal to, or less than s2. It makes the same comparison but compares at most n Process Code characters. The four Extended Unix Code (EUC) codesets are ordered from lowest to highest as 0, 2, 3, 1 when characters from different codesets are compared. wsdup() The wsdup() function returns a pointer to a new Process Code string, which is a duplicate of the string pointed to by s. The space for the new string is obtained using malloc(3C). If the new string cannot be created, a null pointer is returned. wscol() The wscol() function returns the screen display width (in columns) of the Process Code string s. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ |ATTRIBUTE TYPE ATTRIBUTE VALUE | |MT-Level MT-Safe | +-----------------------------------------------------------+ SEE ALSO
malloc(3C), string(3C), wcstring(3C), attributes(5) SunOS 5.11 29 Dec 1996 wstring(3C)
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