Tiny C program for when K&R makes you realize you should probably know what a byte looks like.
Give it text and it prints each byte as symbol, value, hex, and binary. Run it with no args and no stdin and it dumps ASCII 0-127. Pipe in large files or sets of strings or characters and it will print a formatted table.
gcc -O3 -march=native -Wall -Wextra -o char char.c
./char A
./char < war_and_peace.txt
./charC Compiler