Hi,
I used the following Bash script to test substring replacement operator.
It is performance get worse very quickly with the increasing of the string
length.
I test the script with Bash(4.1) on Debian Linux machine.
See the execution time difference by increasing the $NUM in the script:
========================================
#! /usr/local/bin/bash
declare z="start"
declare NUM=1000
#----------------------------------
# create a long string with ';'
#----------------------------------
for ((i=0; i<$NUM; i++)); do
z="$z;string$i"
done
#------------------------------
# delete everything except ';'
#------------------------------
date +%s
x="${z//[^;]}"
echo $x
date +%s
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