「aptitude upgrade」命令是否對Debian執行完全升級或安全升級？

Question

命令aptitude full-upgrade和aptitude safe-upgrade都是documented，包括dist-upgrade別名爲full-upgrade。

但是，只需aptitude upgrade也會以某種方式升級系統......它默認使用哪種方式？另外我怎麼會爲自己找到這個？ man aptitude upgrade沒有幫助。

Answer 1

如在source-code（而不是文檔）中可以看出，upgrade確實是safe-upgrade別名：

else if(!strcasecmp(argv[0], "full-upgrade") || 
    !strcasecmp(argv[0], "dist-upgrade")) 
{ 
    default_action = cmdline_upgrade; 
    // [...] 
    upgrade_mode = full_upgrade; 
    // [...] 
    resolver_mode = resolver_mode_full; 
} 
else if(!strcasecmp(argv[0], "safe-upgrade") || 
    !strcasecmp(argv[0], "upgrade")) 
{ 
    default_action = cmdline_upgrade; 
    // [...] 
    upgrade_mode = safe_upgrade; 
    // [...] 
    resolver_mode = resolver_mode_safe; 
}