Shell Programming and Scripting

FILE_NAME=$1
if [ -f $FILE_NAME ]
then 
    echo "\n Files are available to process \n"
else 
    echo "\n File does not exist: Process is Terminating \n"
    exit 1
fi

for FILE_NAME in $FILE_NAME
do
eval mv -f '$FILE_NAME' $File_NAME
sed -ne '2,1p' $File_NAME > Hdr_$File_NAME
sed -ne '3,$p' $File_NAME > Dtl_$File_NAME
done

for FILE in $(ls -1 \'*)
do
 
file=${FILE#\'}
file=${file%\'}

mv -f "$FILE" "$file"

file1=$(echo "$file" | sed -e "s|^|Hdr_|g")
file2=$(echo "$file" | sed -e "s|^|Dtl_|g")

sed -ne '1,2p' "$file" > $file1
sed -ne '3,$p' "$file" > $file2
 
done

FILE_NAMES="$@"

if [ -f "$1" ]
then
    echo "\n Files are available to process \n"
else
    echo "\n Specified files do not exist: Process is Terminating \n"
    exit 1
fi

for quoted_file_name in $FILE_NAMES
do
  file_name=${quoted_file_name//\'/}
  mv -f $quoted_file_name $file_name
  sed -ne '1,2p' $file_name > Hdr_$file_name
  sed -ne '3,$p' $file_name > Dtl_$file_name
done

# ls
'abc.def.ghi.jkl'       'abc.def.rew.ter'       'abc.def.xty.xyz'

# for file in \'*;do echo mv "$file" "${file//\'/}";done
mv 'abc.def.ghi.jkl' abc.def.ghi.jkl
mv 'abc.def.rew.ter' abc.def.rew.ter
mv 'abc.def.xty.xyz' abc.def.xty.xyz

# for file in \'*;do mv "$file" "${file//\'/}";done

# ls
abc.def.ghi.jkl abc.def.rew.ter abc.def.xty.xyz

file1=$(echo "$file" | sed -e "s|^|Hdr_|g")
file2=$(echo "$file" | sed -e "s|^|Dtl_|g")

for FILE in $(ls -1 \'*)
do
 
file=${FILE#\'}
file=${file%\'}

mv -f "$FILE" "$file"

sed -ne '1,2p' "$file" > Hdr_$file
sed -ne '3,$p' "$file" > Dtl_$file
 
done