1 - /ALL

    Displays the current values of all symbols in the specified
    symbol table (/LOCAL or /GLOBAL). If you specify the /ALL
    qualifier and do not specify either the /LOCAL or the /GLOBAL
    qualifier, the SHOW SYMBOL command displays the contents of the
    local symbol table for the current command level.

2 - /GLOBAL

    Searches only the global symbol table for the specified symbol
    name. If you specify both the /ALL and /GLOBAL qualifiers, all
    names in the global symbol table are displayed.

3 - /LOCAL

    Searches only the local symbol table for the current command
    level for the specified symbol name. If you specify both the /ALL
    and /LOCAL qualifiers, all names in the local symbol table for
    the current command level are displayed.

4 - /LOG

       /LOG (default)
       /NOLOG

    Controls whether the system generates an informational message if
    the symbol value has been truncated. The value is truncated if it
    exceeds 255 characters.