man asciiを使ってASCII表を調べます.

ASCII(7)                                             Linux Programmer's Manual                                             ASCII(7)

NAME
       ascii - ASCII character set encoded in octal, decimal, and hexadecimal

DESCRIPTION
       ASCII is the American Standard Code for Information Interchange.  It is a 7-bit code.  Many 8-bit codes (such as ISO 8859-1,
       the Linux default character set) contain ASCII as their lower half.  The international counterpart of ASCII is known as  ISO
       646.

       The following table contains the 128 ASCII characters.

       C program '\X' escapes are noted.

       Oct   Dec   Hex   Char                        Oct   Dec   Hex   Char
       ────────────────────────────────────────────────────────────────────────
       000   0     00    NUL '\0'                    100   64    40    @
       001   1     01    SOH (start of heading)      101   65    41    A
       002   2     02    STX (start of text)         102   66    42    B
       003   3     03    ETX (end of text)           103   67    43    C
       004   4     04    EOT (end of transmission)   104   68    44    D
       005   5     05    ENQ (enquiry)               105   69    45    E
       006   6     06    ACK (acknowledge)           106   70    46    F
       007   7     07    BEL '\a' (bell)             107   71    47    G
       010   8     08    BS  '\b' (backspace)        110   72    48    H
       011   9     09    HT  '\t' (horizontal tab)   111   73    49    I

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