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Full Discussion: Need help improving my script.
Top Forums Shell Programming and Scripting Need help improving my script. Post 302970884 by bakunin on Wednesday 13th of April 2016 05:29:43 AM
Old 04-13-2016
Quote:
Originally Posted by garlandxj11
What is the difference in "+" instead of "\;" ? What about that would help with the speed? Sorry for my ignorance. I really am trying to learn as I go on this. Smilie
First off: no problem! There no dumb questions, just dumb answers, so don't be shy.

The difference is that "\;" will call the command named in "-exec" each time a file is found. For instance, let us suppose in the curent directory are 5 files, "a", "b", "c", "d" and "e" (and nothing else):

Code:
find . -type f -exec rm {} \;

This wil delete all the files, but it will delete every file individually. In fact this will be executed:

Code:
rm a
rm b
rm c
rm d
rm e

But "rm" can take a list of files as well and this:

Code:
find . -type f -exec rm {} +

would be the same as

Code:
rm a b c d e

The difference seems to be small, but the most time, when calling a command like "rm", is the loading and starting of the program, not its execution. Therefore, if the command is executed only every fifth time the speed gain will be quite noticeably.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
rangarasan
 

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LEARN ABOUT OSF1

uudemon

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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