⍝ Find 'string' ⍵ in component file ⍺:

    fid←'Dfns Test Temp File'

    {22:: ⋄ {}⍵ ⎕ferase ⍵ ⎕ftie 0} fid          ⍝ ensure file doesn't exist.

    tie←fid ⎕fcreate 0                          ⍝ Create temp file.
    app←+∘(⎕fappend∘tie)                        ⍝ Append to file.

    app'hello'                                  ⍝ component 1.
1
    app'world'                                  ⍝ component 2.
2
    app'hello' 'world'                          ⍝ component 3.
3
    app'bonjour' 'monde'                        ⍝ component 4.
4
    app('hello' 'world')('bonjour' 'monde')     ⍝ component 5.
5
    tie filefind'hello'                         ⍝ components with 'hello'
1 3 5
     tie filefind'bonjour'                      ⍝ etc.
4 5
    tie filefind'hello' 'world'
3 5
    tie filefind'o'
1 2 3 4 5
    tie filefind'e'
1 3 4 5

    tie=⎕funtie tie                             ⍝ release file tie.
1
    fid filefind'monde'                         ⍝ after using file <name>,
4 5
    1∊fid⍷⎕fnames                               ⍝ no residual file tie.
0
    tie≡fid ⎕ferase fid ⎕ftie 0                 ⍝ remove temp file.
1

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