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i see, you want to put the code in another script and run it. try it[untested]
echo "sed '${lineNum}i\\${sourceString}\\' ${dataSource}" > nir.ksh

sorry, i am not look into your script last time. it shold like this[untested]:
read var < <(vmstat 1 1 |...)
there has a blank between tow "<"s, and no blank between "<" and "("

if eval [ "\$DATA$x" = "element0" ]; then echo element 0 found; fi
or
eval [ "\$DATA$x" = "element0" ]&& echo element 0 found

try:
sed ${lineNum}i'\'${sourceString}'\' ${dataSource}
or
sed ${lineNum}i\\${sourceString}\\ ${dataSource}

be careful, there should have a blank character between the two "<"s
read var < < echo $(vmstat 1 1 |...)

FYI. From BASH Frequently-Asked Questions (http://www.faqs.org/faqs/unix-faq/shell/bash/)

awk way:
awk 'NR==FNR{a[$1]=$2}NR!=FNR{if($1 in a)$1=a[$1];print}' ren f_name

dc is another choice. it's up to you.
dc -e '1.1 1+p'

try:
grep -vf mypattern myfile

sed '/process-type id="'"$SCHEMA_NAME"'"/,/<\/process-type>/{ /<port id="rmi"/s/foo1/bar1/; /<port id="jms"/s/foo2/bar2/; }'

exec 3>&1
RC=$(exec 4>&1;{ proc;echo $? >&4; }|tee -a logfile >&3)
exec 3>&-
echo $RC

for gnu awk:
awk 'ORS=(i=!i)?",":RS' myLogFile

final word. how fun *nix is! i like it.

the normal way is like this :o
sed '$!N;s/\n//'

sed 's/[^(]*//'

awk 'FNR==1 {offset=-$1;if(NR>1) close(of);of=FILENAME".out"} {$1+=offset; print >of}' GPS*.xyz

try
export PATH="/usr/ccs/bin:/opt/sfw/bin:/usr/local/sbin:/usr/local/bin:$PATH"
or
setenv PATH="/usr/ccs/bin:/opt/sfw/bin:/usr/local/sbin:/usr/local/bin:$PATH"

the difference is the number of rows.

try:
for (( i=1;i<=100;i++ ))
do
echo $RANDOM $i
done|sort -k1|cut -d" " -f2|head -10|while (condition)
do
read number
do some work here using random number until condition satisfied
done

well, the bash variable "$RANROM" is a random integer between 0 and 32767. if the condition is independent of generated random number, try to imagine the loop block has already run 32768 cycles, all...

Select 10 numbers from 1 through 80

for (( i=1;i<=80;i++ )) do echo $RANDOM $i; done|sort -k1|cut
-d" " -f2|head -10

it works using bash

it works with GNU bash(version 2.05b) on gentoo.
try:
comm -13 <(cut -d: -f1 $testfile.lst | sort | uniq) <(cut -d: -f1 $testfile.lst.old | sort | uniq) >results.lst

gnu sed:
sed -n '1h;1!{g;p}'

except the 1st field, rest of fields will be highlight with <b> tag.
try:
awk '{for(i=2;i<=NF;i++)$i="<b>"$i"</b>";print}'

gnu sed:
sed 'h;s/.......//;x;s/\(.......\).*/\1/;s/ /0/g;G;s/\n//'

gnu awk:
awk '$2="<b>"$2"</b>"' old.html >new.html