$2.$ Use a one$-$line command$-$line statement to count how many specimens can be found in the FASTA file dna$1.$fasta. If the FASTA file dna$1.$fasta cannot be found, then the error message needs to be written to a text file errors.log$.$

Note: You have to make use of pipes $($i$.$e$.,|)$ to run multiple commands as a one$-$line command$-$line statement, and where a pipe makes it possible to connect the standard output of one command to the standard input of another command.