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--- transformations:runprogram [2016/09/20 23:20] – dmitry
+++ transformations:runprogram [2016/09/20 23:22] – dmitry
@@ Line 14: / Line 14: @@
 ===Capturing output===
 It is possible to capture STDOUT and STDERR of the executed external application or Windows shell command. For instance it is possible to run //dir// and capture its output as a table in EasyMorph, or forward output of an application into EasyMorph without creating a temporary intermediate CSV file. STDERR is captured in a separate column, which can later be used for error-handling routines. Since EasyMorph also outputs errors into STDERR this feature can be used for error handling of EasyMorph projects executed in the command line mode.
+===Parameter substitution===
+The transformation allows defining its command line as a text or as a calculated expression. It is possible to insert [[parameters]] into text. For instance:
+        copy /Y {SourceFileName} {DestinationFileName}
+The command line above is equivalent to the calculated expression below, but is easier to use.
+	“copy /Y “ & {SourceFileName} & “ “ & {DestinationFileName}
+//SourceFileName// and //DestinationFileName// are parameter names.
 ===See also===
 [[http://easymorph.com/learn/reusable-projects.html|Tutorial:Reusable projects and mass operations with files]]