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Shell variables are not expanded when they appear in a string quoted by single-quotes. Since there are no spaces in the output from that date command, you could just use:
Sausage1=`date '+%Y%m%d'`...

Just an afterthought: if i have gotten correctly what you want to do is 1) wait until a file is there and 2), if it is there wait until "TRL" appears in it.

Such things should be best put into a...

Are you sure it's just sitting there? Are you sure it "worked perfectly"? There's at least a do ... done missing for the second while.

Different approach for waiting "for a file to appear": while...

And even if grep of a directory made sense, the commands at the end of the pipeline:
grep -c filename.$DATE.TXT | grep TRL | wc -l
will always return 0; never 1. The grep -c output will always be...

Other then mentioned, use #!/bin/bash -x and examine the nohup.out during the hang.

If you are on linux system, inotify should provide much better interface for actions on file changes.
...

You didn't reply to jim's first question. "Is the file being generated byyour account - i.e., the process runs under your username.?"

If yes, you need to use the correct way of implementation....

The easiest way to know that a file is complete is to also write a marker file, so if you are sending it with ftp or similar, you would do the following on the sending:-cd $target_dir
put $file
put...

First you need to precisely define "done". Then how do you handle error conditions?

And you need to take into account the only entity that knows for certain that the file is "done" - and correct...

Is the file being generated byyour account - i.e., the process runs under your username.
If this is Linux, you can use the /proc filesystem to see if there exists a file descriptor open for that...

Some optimizations
checktime=`ls -l /tmp/TRIGGER | awk '{ print $8 }' | sed 's/://'`
or if you check very often
checktime=`date +%H%M`
Schedule the command for 01:00
echo "Bstats1.sh 1" | at...

What system do you use? Does it have the stat command (or similar) providing file statistical info?
Why do you break the while loop instead of using the -f test's result?
Do you REALLY need to...

I'm sorry to hear that, the 'find' in your OS must frustrated you..

Are you able to touch some file in the directory that you are monitoring ?
If so, you could run your script via cron every...

#! /bin/bash

f="Thisfile.20130521.txt"

dt=`echo $f | cut -d'.' -f2`
day=`date -d $dt +%a`

if [[ "$day" == "Wed" || "$day" == "Thu" || "$day" == "Fri" ]]
then
fut_dt=$(( $dt + 5 ))...

I think my idea probably fits. I think something like this will likely work in a shell script:

today=`TZ=CST+24 date '+%d%m%y' --date=today`
yesterday=`TZ=CST+24 date '+%d%m%y'...

Just playing around, as least on my linux computer, is this what you're looking for?
$ TZ=CST+24 date '+%d%m%y' --date=today
020413
$ TZ=CST+24 date '+%d%m%y' --date=yesterday
010413

assuming the your width is 79:

cal | sed -e :a -e 's/^.\{1,77\}$/ & /;ta'


Courtesy of sed1liners (http://www.pement.org/sed/sed1line.txt)