Sequential Extensions

Processing a series of files with sequential extensions.

Often a user would like to process a series of files with sequential extensions automatically. The filenames may have extensions such as:

my_filename.001
my_filename.002
...
my_filename.010
my_filename.011
my_filename.012
...
my_filename.999


This can be awkward because of the different number of leading zeros in each case. One way to handle this sort of problem is with the eva command:

eva symbol_name (expression) num_of_characters


num_of_characters this is the number of characters used to define the symbol name.

Thus you could use the following sort of construction to read a series of filenames:

for row 1 999
eva exten (&row) 3
re &filename.&exten
ft
...

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