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Full Discussion: FASTEST way to loop a script 10k times
Top Forums Shell Programming and Scripting FASTEST way to loop a script 10k times Post 302604745 by agama on Monday 5th of March 2012 11:11:49 PM
Old 03-06-2012
From your text I get the impression you are concerned only with the final file and not the 9,999 intermediate ones, and from that it doesn't seem that you are appending to existing output files as your example suggests, but are creating new intermediate files to be used only for the next input. If I assume correctly then this should work:

Code:
input=input1.bed
for (( i = 0; i < 10000; i++ ))
do
    c-random-script -i $input -g g19 -e DB >output
    mv output last_output
    input=last_output
done
mv last_output final-desired-name

The speed will depend completely on the time it takes "random script" to execute 10K times.
Last edited by agama; 03-06-2012 at 12:12 AM.. Reason: buggered code tag of all things!!
 

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LEARN ABOUT OPENSOLARIS

time

time(1T)						       Tcl Built-In Commands							  time(1T)

__________________________________________________________________________________________________________________________________________________

NAME

       time - Time the execution of a script

SYNOPSIS

       time script ?count?
_________________________________________________________________

DESCRIPTION

       This command will call the Tcl interpreter count times to evaluate script (or once if count isn't specified).  It will then return a string
       of the form
	      503 microseconds per iteration
       which indicates the average amount of time required per iteration, in microseconds.  Time is measured in elapsed time, not CPU time.

EXAMPLE

       Estimate how long it takes for a simple Tcl for loop to count to a thousand:
	      time {
		  for {set i 0} {$i<1000} {incr i} {
		      # empty body
		  }
	      }

SEE ALSO

       clock(1T)

KEYWORDS

       script, time

ATTRIBUTES

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

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl																	  time(1T)
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