Shell Programming and Scripting

file=$(ls -tr abc*.txt | tail -1)
length=$(expr length "$file")
let date_len=$length-11
let text_len=$length-13
var_date=$(expr substr $file $date_len 8)
echo $var_date
v1=$(cat reporting_date.txt)
year=$(expr  substr $v1 7 4)
mon=$(expr substr $v1 1 2)
day=$(expr substr $v1 4 2)
v_rdate=$year$mon$day
echo $v_rdate
var_text=$(expr substr $file 1 $text_len)
var_newfile=$var_text.txt
if [ "$var_date" = "$v_rdate" ]
then
cp $file $var_newfile
else
echo "not equal"
exit
fi

abc_20091030.txt
dgt_20091030.txt
wqe_20091030.txt

$ 
$ cat process.sh
#!/bin/bash
echo "You passed : $1"
$ 
$ cat r.txt
abc_20091030.txt
dgt_20091030.txt
wqe_20091030.txt
$ 
$ while read FILENAME
> do
>   ./process.sh $FILENAME
> done <r.txt
You passed : abc_20091030.txt
You passed : dgt_20091030.txt
You passed : wqe_20091030.txt
$ 
$

abc
dgf
...
..

file=$(ls -tr ${1}*.txt | tail -1)

cat r.txt|xargs -i echo  script.sh {}

Filename=$1
for files_to_parse in `cat $Filename`
do
        echo "Parsing file \"$files_to_parse\" from $Filename"
done

Parsing file "a.test" from action
Parsing file "b.test" from action
Parsing file "c.test" from action

Filename=$1
while read files_to_parse
do
        echo "Parsing file \"$files_to_parse\" from $Filename"
done < $Filename