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How to check if an email address exists without sending an email?
...er might not even know all accounts within.
– David Mårtensson
Feb 27 '11 at 21:25
3
Then why do...
Postfix发信的频率控制几个参数 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...会被浪费，更严重这会被认为是网络攻击而导致服务器或IP被封。因此需要通过一些参数配置解决，重试一定次数后仍失败的就放弃发送。postfix发信的频率控制有几个:
smtpd_client_connection_rate_limit=5
ip地址连接的频率控制.
smtpd_cl...
Is it wrong to use Deprecated methods or classes in Java?
...ormance issue; its too subjective to state that.
– KMån
May 31 '10 at 7:44
1
@KMan A function be...
How can I generate a self-signed certificate with SubjectAltName using OpenSSL? [closed]
...sage to the following under [ v3_ca ]:
keyUsage = digitalSignature, keyEncipherment
digitalSignature and keyEncipherment are standard fare for a server certificate. Don't worry about nonRepudiation. It's a useless bit thought up by computer science guys/gals who wanted to be lawyers. It means not...
How to test an Internet connection with bash?
...
Ping your default gateway:
#!/bin/bash
ping -q -w 1 -c 1 `ip r | grep default | cut -d ' ' -f 3` > /dev/null && echo ok || echo error
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Convert line-endings for whole directory tree (Git)
...
Piping find to xargs will fail if find matches any files with whitespace, quotes, or other shell meta characters in their path. At the least use find blog -type f -print0 | xargs -0 dos2unix to handle the case of whitespace. Y...
How can I start an interactive console for Perl?
...
I wrote a script I call "psh":
#! /usr/bin/perl
while (<>) {
chomp;
my $result = eval;
print "$_ = $result\n";
}
Whatever you type in, it evaluates in Perl:
> gmtime(2**30)
gmtime(2**30) = Sat Jan 10 13:37:04 2004
>...
Android device does not show up in adb list [closed]
I have a HP Slate 21 that is connected to my Windows box using a USB cable. USB debugging is enabled on the device. After adding the proper %SingleAdbInterface% and %CompositeAdbInterface% entries to the android_winusb.inf file, I now see "Android ADB Interface" in my Device Manager. However, ru...
Force unmount of NFS-mounted directory [closed]
...ing (including lsof). I caused the problem by breaking out of a backup script that I'm writing. The script mounts and unmounts the directory, but something about breaking out of rsync messed up my mount. I didn't know about the lazy unmount. It may have been the NAS device causing all the troubl...
Get hours difference between two dates in Moment Js
...uch questions & answers wouldn't fly.
– Jean-François Fabre♦
Nov 2 '19 at 8:55
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