 ## To Calculate Count Of Amino Acid In Fasta File
   grep -v ">" filename.fasta | tr -d '\n' | awk 'BEGIN {FS=""} {for(i=1;i<=NF;i++) count[$i]++} END {for (aa in count) print aa, count[aa]}' | sort
 ## To Calculate Percentage Of Each Amino Acid  
   grep -v ">" filename.fasta | tr -d '\n' | awk 'BEGIN {FS=""} {for(i=1;i<=NF;i++) count[$i]++} END {for (aa in count) printf("%s %.2f%%\n", aa, count[aa]*100/NF)}' | sort
 ## To Obtain The Percentage Of Specific Amino Acid In Fasta File
    grep -v ">" sequences.fasta | grep -o "A" | wc -l | awk -v total=$(grep -v ">" sequences.fasta | tr -d '\n' | wc -c) '{ printf("%.2f%%\n", ($1 / total) * 100) }'