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Task/File-size/LiveCode/file-size.livecode

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+// root folder
+set the defaultfolder to "/"
+repeat for each line fline in (the detailed files)
+    if item 1 of fline is "input.txt" then
+        put item 2 of fline --bytes
+        exit repeat
+    end if
+end repeat
+
+// current working dir of stack
+put the effective filename of this stack into tPath
+set the itemDelimiter to slash
+delete last item of tPath
+set the defaultfolder to tPath
+repeat for each line fline in (the detailed files)
+    if item 1 of fline is "input.txt" then
+        put item 2 of fline
+        exit repeat
+    end if
+end repeat