1) Write a script that takes a fasta file name as a command line parameter. The script should return the longest sequence in the file, and output the average sequence length.

2) Write a script that takes a fasta file name as a command line parameter. The script should output the base composition (or amino acid composition) of each sequence, and of all sequences combined.

3) Write a script that takes a fastq file and outputs a fastq file where leading and trailing nucleotides under a certain quality value are truncated.