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This sed may help:
$ sed -r "s/([0-9]{1,})(_{,1})[a-zA-Z]{3}(_{,1})([0-9]{1,})/\1\2xxx\3\4/g" infile
563MS333_101_xxx_400-100_screening
563MS333_104-525_xxx_525_screening...

Using GNU date:
$ date --date="Dec 11" +"%Y-%m-%d"
2014-12-11

This should work (except for Washington :) )

grep -v -f Filter.txt Data.txt

Just enclose the var in quotes:
awk -v var="`cat kk2 |grep "Makarand"`" 'BEGIN { if (var != "") {print var;exit;}}'

As @pilnet101 points , your code is getting messy. :)

It's looking for the file in the remote machine ,never gonna work.

Try this:
#!/bin/bash
typeset -i interval=5
run=true
trunk=vonage
reboot=0
while [[ "$run" == "true" ]]; do
checktrunk=$(asterisk -rx "sip show peer $trunk" | grep -c "Status.*OK")
if...

Not tested but try to add retserverror to your isql command:
isql -Uxyz -SSYB_LOCOMOTIVE_xx -Pabc -Dlmn -w300 -o$sumOfJEOutputFile --retserverror

Remove tee and try again:
sftp -v -oport=nn $FTP_USER@$FTP_HOST <<EOF 2>&1
cd ${TGT_FOLDER_NAME}
lcd ${SRC_FOLDER_NAME}
put ${FNAME}
EOF
if [ $? -ne 0 ];then
echo "sftp fails"
exit
fi...

Capture sftp exit code:
ls $FILE_NAME | while read FNAME
do
sftp -v -oport=nn $FTP_USER@$FTP_HOST <<EOF 2>&1 | tee -a ${LOG_FILE_NAME}
cd ${TGT_FOLDER_NAME}
lcd ${SRC_FOLDER_NAME}
put ${FNAME}...

What you done so far ?

This way:
VAR=$(ssh Server "grep 'Listener stopped' /logs/perf.log")

If pkill is avaliable.
First: store your pid.
#!/bin/bash
switch.sh &
echo $! >/path/to/pid.file
Second: if still alive use pkill:
-P ppid,...
Only match processes whose...

Of course , the line variable only gets value after the first iteneration of the loop, in other words the first line is printed in the second iteration and so on.

Finally the penultimate line will...

Do not load it in memory, try:
open ( FA, "$fileA" ) || die("can't open fileA $!");
open ( FB, "$fileB" ) || die("can't open fileB $!");
open ( TMP, ">> tmp_file" ) || die("can't open tmp_file...

To print line after pattern:

sed -n '/pattern/{n;p;}' infile

Nice & clean @Yoda , just one point i .. i would use next to avoid the second matching this way:
awk '
/>/ {
$0 = ( NR == 1 ? $0 : RS $0 RS )
print
...

An awk:
awk '{ORS=/^>/?"\n":"";print}' infile

If you have a multiple set file (and adding last rc as @RudiC proposes):
awk '{ORS=sub(/^>/,"\n>")?"\n":"";print}END{print "\n"}' infile

Add tou your ssh:
-o ConnectTimeout=n
Where n is compute as seconds.

Use:
while read LINE
do
echo "line is"
if [ -n $LINE ]
then
echo "line is $LINE"
echo " "
Y=${#fileclob}
if [ $Y = 0 ]
then
fileclob=$LINE
echo "fileclob_1...

Hi @wisecracker, i just wanted tho show a practical usage of look-ahead/behid assertion, for me the important thing here is not the print statement and of course i can't guarantee python in all *nix...

This could be done by using look-behind and look-ahead regexp.
A python example:
>>> import re
>>> text =...

A python:
# cat test.py
#!/usr/bin/env python
import re

text = '''root 25 oracle 25 batch 30 griduser 32 admin 35
root 25 oracle 25 batch 30 griduser 32
oracle 25 batch 30 griduser 32...

If null fields still a problem you can bypass the problem easily setting a fixed value for them:
SET NULL ''

Try:
awk 'sub(/~[^~]+~$/,"")' file

First: use code tags por your sample code.

This is the correct way for your needs:
import glob
text = 'abc*'
same_name_files = glob.glob(text)