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Consider the following loop.
This allows three command line options , one of which accepts an argument(b),
because "b" is followed by a ":" in the getopts arguments.
When processing option b ,...

i'm not sure i understood correctly but if you want to grep only on the second line, something like this might be helpful:

head -2 data.txt | tail -1 | grep "single"

correction for 4)
you need a fi for this if:
if [[ $IsCronJob -ne 1 ]]; then

1)
.....
a) FilesToDelete="OPTARG"
.....
Shouldn't it be $OPTARG instead of OPTARG ?

2 ) put a ;; after the "esac" at the end of the second "case"

3) you need a "fi" after this

if [[...

ooops i've forgotten the brackets. you're absolutely right

try this :

find . | xargs grep -l "test"

nawk supports more than one field separator on the command line:

nawk -F':+' ....

how do you tell that it's looping infinitely.
maybe it's just expecting input because $file is NULL ??

an example :

ls -ltr | awk '{print $5}' |
while read size
do
echo "size is $size"
done

what's an expect script?
i don't understand it but you can check the exit status of any process
by checking $? right after you call the script.
For instance:

expect_script
if [ $? -eq 0 ]
...

oh yes , you're right :)
i assumed it's a list of strings.

first of all
not cat $item >> /tmp/output
echo $item >> /tmp/output

you can use this to convert the list to lines and insert into file at once:
echo $LIST | awk '{for (i=1; i<=NF; ++i) {print...

Use exit with an exit code to indicate success or failure
0 : success
anything but 0 : failure

or PID of the shell script if used in a shell script.
can be used to create unique temp files :
ex:
touch temp_$$

just to understand the problem:
what if

file1
-------
a
b
c
f
g
h

file2
---------
a
b
d
e
f
h

this is my solution :
isn't it wonderful that you can have more than one solution in Unix :)


#$1 : file

IFS=:

grep -n "Error:" $1 |
while read line_no the_rest
do
head...

extending previous solution for subfolders:

for file in `find .`
do
mv $file `echo $file | sed 's/:/_/g'`
done

I don't understand why you think it does not give you the file name.
It should work fine as well as the below code.

If you wish to iterate on the contents of the current directory , you don't need to assign a variable the contents of the current directory.The For loop can operate using Unix file name expansion:
...

If I get you right , you want something like this :

if [[ -n $str1 ]] ; then
echo "TRUE"
else
echo "FALSE"
fi

1) I don't think there exists such a utility.There may be experimental utilities , though.
2) A google lookup will get you hundreds of web pages like for instance : Unix Utilities - ticalc.org...

Back on university days , I used pico.But currently I use mostly emacs for programming and vim for text editing.