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Also :<br>
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\def \show #1{\message {\string #1 = #1}}
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\edef \test {\pdffilesize {"file_1.t e x"}} \show \test</p>
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\edef \test {\pdffilesize {"file_1.t e x "}} \show \test</p>
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\edef \test {\pdffilesize {"file_1.t e x" }} \show \test</p>
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\edef \test {\pdffilesize {"file_1.t e x " }} \show \test</p>
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\end<br>
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-><br>
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This is pdfTeX, Version 3.14159265-2.6-1.40.17 (TeX Live 2016/W32TeX) (preloaded format=pdftex)</p>
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restricted \write18 enabled.</p>
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entering extended mode</p>
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(./file_1.t e x \test = 281 \test = 281 \test = 281 \test = 281 )</p>
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No pages of output.</p>
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Transcript written on file_1.log.</p>
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UNIV: as before.<br>
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