Shell Programming and Scripting

#! /usr/bin/bash

FILE_COPY_LIST=$1
SOURCE_DIRECTORY=$2
DESTINATION_DIRECTORY=$3

while read file
do
   if [ ! -f $SOURCE_DIRECTORY'/'$file ]; then
      echo $file "  cannot be found"
   fi
   cp -f $SOURCE_DIRECTORY'/'$file  $DESTINATION_DIRECTORY
done < $FILE_COPY_LIST

id	file_name	IDNUMBER	data
1	ST4125183.txt	ST4125183	151231
2	ST4045313.txt	ST4045313	162214
3	ST4107613.txt	ST4107613	205239
4	ST4144567.txt	ST4144567	252357
5	ST090750.txt	ST090750	280367

#!/usr/bin/bash
FILE_LIST="$1"
FILE_FIELD="$2"
SOURCE_DIR="$3"
DEST_DIR="$4"
 
# Some validation
if [ $# -ne 4 ]
then
   echo "usage: $0 file_list field src_dir dest_dir" >&2
   exit 1
fi
if [ ! -f "$FILE_LIST" ]
then
    echo "Invalid filelist $FILE_LIST">&2
    exit 2
fi
if [ ! -d "$DEST_DIR" ]
then
    echo "Invalid dest directory">&2
    exit 3
fi
if [ ! -d "$SOURCE_DIR" ]
then
    echo "Invalid source directory">&2
    exit 4
fi
 
awk -vS="$SOURCE_DIR" -vFLD="$FILE_FIELD" 'NR==1{for(i=1;i<=NF;i++)if($i==FLD)w=i;next}
w {print S "/" $w}' $FILE_LIST | xargs -r cp --target-directory="$DEST_DIR"

for f in `sed '1 d' test.txt | awk '{print $2}'`
do
# $f contains your file name
  echo Your file name from 2nd column: ${f}
  file_name=`echo ${f}`
done

Your file name from 2nd column: ST4125183.txt
Your file name from 2nd column: ST4045313.txt
Your file name from 2nd column: ST4107613.txt
Your file name from 2nd column: ST4144567.txt
Your file name from 2nd column: ST090750.txt