Answer:
Disadvantages of Batch Operating System:
- The computer operators should be well known with batch systems.
- Batch systems are hard to debug.
- It is sometime costly.
- The other jobs will have to wait for an unknown time if any job fails.
Answer:
A zero-day attack.
Explanation:
A Zero-day vulnerability is a computer-software vulnerability that is unknown to, or unaddressed by, the security community or software developer or even the vendor of the target software. Until the vulnerability is mitigated, hackers can exploit it to adversely affect computer programs, data, additional computers or a network.
An exploit directed at a software with zero-day vulnerability & exploiting this vulnerability is called a zero-day exploit, or zero-day attack.
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<span>public String getemailssername (String aUser)
{
return aUser.substring(0, aUser.indexOf("@"));
}</span>
