Copy files based on content

A few remarks:

• Instead of copy/modify the file, generating a new one in the local directory will be more efficient.

• awk can test the first line, print it, and even modify it, all at the same time.

Here's an idea of what you could do:

_{edit: handling the glob in the path and the possible pre-existence of the destination file}

#!/bin/bash
shopt -s nullglob

for default_dir in .../etc/apps/*/default/data/ui/views/
do
    local_dir=${default_dir/\/default\///local/} # replaces the first occurrence of "/default/" with "/local/"

    for src_file in "$default_dir"*.xml
    do
        dest_file=${local_dir}${src_file##*/}

        # we'll process the local file when it's present (instead of the default one)
        [[ -e "$dest_file" ]] && src_file=$dest_file

        if line=$( awk '
            {
                ok = /version=/
                if (!ok)
                    sub( />/, "version=\"1.1\">" )
                print
                exit !ok
            }
        ' "$src_file"
        )
        then
            printf 'No change necessary to %q\n' "$src_file"
        else
            printf 'Generating %q' "$dest_file"

            { echo "$line"; cat "$src_file"; } > "$dest_file".tmp &&
            mv "$dest_file".tmp "$dest_file"
        fi
    done
done

You might want to use pipes and basename. E.g.

ls <DIR>/*.xml | while read FULLPATH; do 
   SRC=$(basename $FULLPATH)
   <your code>
done

Here is one solution/approach with bash and find and ed to edit the file in place, but change to something available in your system.

#!/usr/bin/env bash

str='version='
value=1.1
src=../etc/apps/default/data/ui/views
dest=../etc/apps/local/data/ui/views

while IFS= read -rd '' -u3 files; do
  IFS= read -r first_line < "$files"
  if [[ $first_line = *"$str"* ]]; then
    printf 'No change necessary to %s\n' "$files"
  else
    printf "Copying %s to local %s\n" "$files" "$src/${files##*/}"        
    cp -v "$files" "$dest" || exit
    printf 'Inserting %s at the first line of %s\n' "$str$value" "$dest/${files##*/}"
    printf '%s\n' '0a' "<?xml $str${value}?>" . w q | ed -s "$dest/${files##*/}"
  fi
done 3< <(find "$src" -type f -name '*.xml' -print0)

Create a dummy directories and files.

mkdir -vp ./etc/apps/default/data/ui/views/
mkdir -vp ./etc/apps/local/data/ui/views/
touch  ./etc/apps/default/data/ui/views/{foo,bar,baz,more}.xml
echo 'version="1.1"' > ./etc/apps/default/data/ui/views/foo.xml

Check the created directories and files.

tree ./etc

Output

./etc/
└── apps
    ├── default
    │   └── data
    │       └── ui
    │           └── views
    │               ├── bar.xml
    │               ├── baz.xml
    │               ├── foo.xml
    │               └── more.xml
    └── local
        └── data
            └── ui
                └── views

9 directories, 4 files

Check the contents of the files in the default directory.

tail -n+1 ./etc/apps/default/data/ui/views/*.xml 

Output

==> ./etc/apps/default/data/ui/views/bar.xml <==

==> ./etc/apps/default/data/ui/views/baz.xml <==

==> ./etc/apps/default/data/ui/views/foo.xml <==
version="1.1"

==> ./etc/apps/default/data/ui/views/more.xml <==

Now execute your script but remove the first . from the path, e.g.

src=./etc/apps/default/data/ui/views
dest=./etc/apps/local/data/ui/views

Output

Copying ./etc/apps/default/data/ui/views/bar.xml to local ./etc/apps/local/data/ui/views/bar.xml
'./etc/apps/default/data/ui/views/bar.xml' -> './etc/apps/local/data/ui/views/bar.xml'
Inserting version="1.1" at the first line of ./etc/apps/local/data/ui/views/bar.xml
Copying ./etc/apps/default/data/ui/views/more.xml to local ./etc/apps/local/data/ui/views/more.xml
'./etc/apps/default/data/ui/views/more.xml' -> './etc/apps/local/data/ui/views/more.xml'
Inserting version="1.1" at the first line of ./etc/apps/local/data/ui/views/more.xml
Copying ./etc/apps/default/data/ui/views/baz.xml to local ./etc/apps/local/data/ui/views/baz.xml
'./etc/apps/default/data/ui/views/baz.xml' -> './etc/apps/local/data/ui/views/baz.xml'
Inserting version="1.1" at the first line of ./etc/apps/local/data/ui/views/baz.xml
No change necessary to ./etc/apps/default/data/ui/views/foo.xml

Check the contents of directories.

tree ./etc

Output

./etc/
└── apps
    ├── default
    │   └── data
    │       └── ui
    │           └── views
    │               ├── bar.xml
    │               ├── baz.xml
    │               ├── foo.xml
    │               └── more.xml
    └── local
        └── data
            └── ui
                └── views
                    ├── bar.xml
                    ├── baz.xml
                    └── more.xml

9 directories, 7 files

Check the file contents from the local directory.

tail -n+1 ./etc/apps/local/data/ui/views/*.xml

Output

==> ./etc/apps/local/data/ui/views/bar.xml <==
<?xml version="1.1"?>

==> ./etc/apps/local/data/ui/views/baz.xml <==
<?xml version="1.1"?>

==> ./etc/apps/local/data/ui/views/more.xml <==
<?xml version="1.1"?>

The script works as intended, just make an adjustment to your needs like Changing the ed code from

printf '%s\n' '0a' "<?xml ${str}?>" . w q | ed -s

to your sed or prefererably an xml editor/parser that can be scripted like xmlstarlet and the likes.

As per the OP's comment including the * glob in the path and an existing file to dest should not be overwritten. The * does not expand on a variable assignment. An array is needed for that.

#!/usr/bin/env bash

shopt -s nullglob

top_dirs=(./etc/apps/*/)
dest=local/data/ui/views/
src=default/data/ui/views/

shopt -u nullglob

str='version='
value=1.1    

while IFS= read -rd '' -u3 files; do
  IFS= read -r first_line < "$files"
  ##: skip files if it is in local/data/ui/views/, don't overwrite.
    [[ -e "${files/default/local}" ]] && continue
  if [[ $first_line = *"$str"* ]]; then
    printf 'No change necessary to %s\n' "$files"
  elif [[ $first_line != *"$str"* ]]; then
    printf "Copying %s to local %s\n" "$files" "${files/default/local}"
    cp -v "$files" "${files/default/local}"
    printf 'Inserting %s at the first line of %s\n' "$str$value" "${files/default/local}"
    printf '%s\n' '0a' "<?xml $str${value}?>" . w q | ed -s "${files/default/local}"
  fi
done 3< <(find "${top_dirs[@]/%/"$src"}" -type f -name '*xml' -print0)

The above script was tested against the dummy files/directories with:

mkdir -vp ./etc/apps/dir{1..5}/default/data/ui/views/
mkdir -vp ./etc/apps/dir{1..5}/local/data/ui/views/
touch ./etc/apps/dir{1..5}/default/data/ui/views/{foo,bar,baz,more}.xml
echo 'version=' > ./etc/apps/dir1/default/data/ui/views/foo.xml

Use grep like so:

grep -vril 'version="1.1"' .../etc/apps/*/default/data/ui/views/*.xml

It'll give you the list of files you without version="1.1" Something like that may work:

while read file_path; do
    file_name=$(basename "$file_path")
    echo 'version="1.1"' > ./"$file_name"
    cat  "$file_path"   >> ./"$file_name"
done < <(grep -vril 'version="1.1"' .../etc/apps/*/default/data/ui/views/*.xml)