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程序员之网络安全系列（二）：如何安全保存用户密码及哈希算法 - 更多技术 ...
... true
2.2.3 :004 > puts Digest::MD5.hexdigest('I love you')
e4f58a805a6e1fd0f6bef58c86f9ceb3
=> nil
2.2.3 :005 > puts Digest::MD5.hexdigest('I love you!')
690a8cda8894e37a6fff4d1790d53b33
=> nil
2.2.3 :006 > puts Digest::MD5.hexdigest('I love you !')
b2c63c3ca6019cff3bad64fcfa807361
=> nil
...
Can I simultaneously declare and assign a variable in VBA?
... a variable can be avoided by using With statement.
For example,
Dim fd As Office.FileDialog
Set fd = Application.FileDialog(msoFileDialogSaveAs)
If fd.Show Then
'use fd.SelectedItems(1)
End If
this can be rewritten as
With Application.FileDialog(msoFileDialogSaveAs)...
libcurl的使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...;
}
int get_file_size(char *filename)
{
int file_len = 0;
int fd = 0;
fd = open(filename, O_RDONLY);
if(fd < 0)
{
perror(“open”);
exit(-1);
}
file_len = lseek(fd, 0, SEEK_END);
if(file_len < 0)
{
perror(“lseek”);
...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...t.
#!/bin/bash
(
# Wait for lock on /var/lock/.myscript.exclusivelock (fd 200) for 10 seconds
flock -x -w 10 200 || exit 1
# Do stuff
) 200>/var/lock/.myscript.exclusivelock
This ensures that code between ( and ) is run only by one process at a time and that the process doesn’t wait...
How do I initialize a byte array in Java?
...string to byte[], you could do
byte[] CDRIVES = hexStringToByteArray("e04fd020ea3a6910a2d808002b30309d");
I'd suggest you use the function defined by Dave L in Convert a string representation of a hex dump to a byte array using Java?
I insert it here for maximum readability :
public static byt...
Controlling a USB power supply (on/off) with Linux
... The permission is denied because a command in the form of sudo foo > bar is parsed as direct the output to bar, then run foo using sudo. The redirection fails because it happens before you get root access. The solution is to use sudo sh -c 'echo disabled > /sys/bus/usb/devices/us...
Send string to stdin
...din. The <(…) is bash process substitution. Roughly it creates a /dev/fd/… file with the output of the substituting command and passes that filename in place of the <(…), resulting here for example in script < /dev/fd/123. For details, see this answer.
Comparison with other solutions
...
How to urlencode a querystring in Python?
...le.com&bravo=True+%21%3D+False&delta=1234567+%21%40%23%24%25%5E%26%2A&charlie=hello+world&alpha=http%3A%2F%2Fwww.example.com
"""
if('YES we DO care about the ordering of name-value pairs'):
queryString = "&".join( [ item+'='+urllib.quote_plus(dict_name_value_pairs[item]) fo...
Why is printing to stdout so slow? Can it be sped up?
...y own amusing experiment, and here are the results.
$ python test.py 2>foo
...
$ cat foo
-----
timing summary (100k lines each)
-----
print : 6.040 s
write to file : 0.122 s
print with stdout = /dev/null : 0.121 s
$ python test.py 2>foo |cat
...
$ cat ...
How to install node.js as windows service?
...ame="NODE_ENV" value="production"/>
<!-- OPTIONAL FEATURE:
FOO_SERVICE_PORT=8989 will be persisted as an environment
variable machine-wide.
-->
<persistent_env name="FOO_SERVICE_PORT" value="8989" />
</service>
...