concat

Concatenates sequences/alignments from different files in the order in which they are provided. Fails if the IDs don't match.

Usage:
    st concat [options][-a <attr>...][-l <list>...] [<input>...]
    st concat (-h | --help)
    st concat --help-vars

Options:
    -n, --no-id-check   Don't check if the IDs of the records from
                        the different files match
    -s, --spacer <N>    Add a spacer of <N> characters inbetween the concatenated
                        sequences.
    -c, --s-char <C>    Character to use as spacer for sequences [default: N]
    --q-char <C>        Character to use as spacer for qualities. The default
                        value is the highest quality value for Illumina 1.8+/
                        Phred+33, since there is no autorecognition of the
                        FASTQ encoding [default: J]

See this page for the options common to all commands.