Shell Programming and Scripting

for $i in *.txt
do
perl myscript.pl $i > $i.new
done

## Assuming the following directory structure:
## /abc/xyz/2010_06_09_A
## /abc/xyz/2010_06_09_B
## ...
## /abc/xyz/2010_06_09_Z

cd /abc/xyz
for i in */Data.txt
do
  perl myscript.pl $i > $i.new
done

cd /abc/xyz
for i in */Data.txt
do
  dir=${i%/*}
  file=${i##*/}
  cd "$dir"
  perl myscript.pl ${file} > $i.new
  cd -
done

#!/usr/bin/perl -w
...
while ($file = glob("<your_directory>/*/Data.txt")) {
  # Now you have the full path in $file.
  # Process it the way you want.
  # You can even create and write to "$file.new" thereby 
  # avoiding the shell's redirection operator.
  ... your code here
}

./myScript.sh: $i: is not an identifier

#!/bin/tcsh
cd /abc/xyz
for $i in */Data.txt
do
    perl myScript.pl $i > $i.new
done

*/Data.txt

cd abc/xyz

for i in */Data.txt
do
    #echo $i
    perl myScript.pl $i > $i.output
done

./yourScript.sh: line 10: */Data.txt.output: No such file or directory