tcat: Concatenates multiple similar tables
tcat is a tool for concatenating any number of
similar tables one after the other.
The tables must be of similar form to each other (same number and
types of columns). Preprocessing of the tables may be done using
icmd parameter, which will operate in the same
way on all the input tables. Table parameters of the output table
will be taken from the first of the input tables.
Subject to some constraints on the details of the input and output
formats and processing,
tcat is capable of joining
an unlimited number of tables together to produce an output table of
unlimited length, without large memory requirements.
If there are very many input files, it may be necessary to set the
lazy parameter so that they are not all kept open
If you have heterogeneous tables, in different formats or
requiring different preprocessing steps from each other before
they can be concatenated, use