formatter fastx_toolkit zcat -f '$input' | fasta_formatter -w $width -o $output

**What it does** This tool re-formats a FASTA file, changing the width of the nucleotides lines. **TIP:** Outputting a single line (with **width = 0**) can be useful for scripting (with **grep**, **awk**, and **perl**). Every odd line is a sequence identifier, and every even line is a nucleotides line. -------- **Example** Input FASTA file (each nucleotides line is 50 characters long):: >Scaffold3648 AGGAATGATGACTACAATGATCAACTTAACCTATCTATTTAATTTAGTTC CCTAATGTCAGGGACCTACCTGTTTTTGTTATGTTTGGGTTTTGTTGTTG TTGTTTTTTTAATCTGAAGGTATTGTGCATTATATGACCTGTAATACACA ATTAAAGTCAATTTTAATGAACATGTAGTAAAAACT >Scaffold9299 CAGCATCTACATAATATGATCGCTATTAAACTTAAATCTCCTTGACGGAG TCTTCGGTCATAACACAAACCCAGACCTACGTATATGACAAAGCTAATAG aactggtctttacctTTAAGTTG Output FASTA file (with width=80):: >Scaffold3648 AGGAATGATGACTACAATGATCAACTTAACCTATCTATTTAATTTAGTTCCCTAATGTCAGGGACCTACCTGTTTTTGTT ATGTTTGGGTTTTGTTGTTGTTGTTTTTTTAATCTGAAGGTATTGTGCATTATATGACCTGTAATACACAATTAAAGTCA ATTTTAATGAACATGTAGTAAAAACT >Scaffold9299 CAGCATCTACATAATATGATCGCTATTAAACTTAAATCTCCTTGACGGAGTCTTCGGTCATAACACAAACCCAGACCTAC GTATATGACAAAGCTAATAGaactggtctttacctTTAAGTTG Output FASTA file (with width=0 => single line):: >Scaffold3648 AGGAATGATGACTACAATGATCAACTTAACCTATCTATTTAATTTAGTTCCCTAATGTCAGGGACCTACCTGTTTTTGTTATGTTTGGGTTTTGTTGTTGTTGTTTTTTTAATCTGAAGGTATTGTGCATTATATGACCTGTAATACACAATTAAAGTCAATTTTAATGAACATGTAGTAAAAACT >Scaffold9299 CAGCATCTACATAATATGATCGCTATTAAACTTAAATCTCCTTGACGGAGTCTTCGGTCATAACACAAACCCAGACCTACGTATATGACAAAGCTAATAGaactggtctttacctTTAAGTTG