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Top Forums Shell Programming and Scripting speeding up bash script with "while read line" Post 302526484 by gary_w on Tuesday 31st of May 2011 04:00:21 PM
Old 05-31-2011
For the sake of argument...

You could change:
Code:
mCurr=${mCurr}+1

to:
Code:
((mCurr+=1))

to have the korn shell perform integer math inline and speed things up even more. It's actually quite surprising the difference it makes. consider this example:
Code:
#!/bin/ksh

integer limit=100000
integer ctr=0

function method1 {
ctr=0
print "\nfunction 1 starting $ctr"
while ((ctr < $limit))
do
   ctr=${ctr}+1
done
print "function 1 ending $ctr"
}

function method2 {
ctr=0
print "\nfunction 2 starting $ctr"
while ((ctr < $limit))
do
  ((ctr+=1))
done
print "function 2 ending $ctr"
}

time method1

time method2

exit 0

Output:
Code:
 $ ./aa

function 1 starting 0
function 1 ending 100000

real    0m3.46s
user    0m3.45s
sys     0m0.00s

function 2 starting 0
function 2 ending 100000

real    0m2.16s
user    0m2.16s
sys     0m0.00s
  $

While not a huge difference for this simple example, it could make an impact if multiple calculations are being done on millions of records.
This User Gave Thanks to gary_w For This Post:
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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