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Theres a left parenthesis missing at the start. In regexes, | is the "alternation" or "OR" operator, so above reads "match a number consisting of"
[0-9] a single digit ...

Hi.

The syntax for email addresses is complicated. Here's a short perl code that tries to catch most correct addresses:
#!/usr/bin/env perl

# @(#) p1 Demonstrate recognize email...

Try thispingfunc ()
{
for (( i=$a; i<=$b; i++ ))
do
/bin/ping -c 1 $c$i > /dev/null 2>&1 && echo $c$i is pingable || echo no answer from $c$i
done
}
I have changed the count from 4 to 1 on...

Try also
IP1=172.30.36.1
IP2=172.30.36.10
for ((i=${IP1##*.}; i<=${IP2##*.}; i++)); do echo ping -c4 ${IP1%.*}.$i; done

Your variable assignment doesn't work that way:
- no space after the = sign
- use "command substitution" $(...) for the pipes

You could use shell's "parameter expansion" (instead of above...

This is not that easy, as it heavily depends on top's configuration, and on the tools that are available on your system (which, by the way, you fail to mention in your request). My best result on my...

array length can be retrieved as ${#array[@]}

for (( index=${#array[@]}-1 ; index>=0 ; index-- )) ; do
echo "${array[index]}"
done

Assuming bash or ksh to be your shell, try
str="* * * * *"
for i in 1 2 3 4 5
do echo "$str"
str="${str/\*/ }"
done
* * * * *
* * * *
* * *
* *
*