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How to check if a symlink exists
...n't exist"
fi
the result of above is like:
root@linux:~# ./sym.sh /etc/passwd
you entry is not symlink
root@linux:~# ./sym.sh /usr/mda
your entry is symlink
root@linux:~# ./sym.sh
=> File doesn't exist
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What does multicore assembly language look like?
...ng "load the EDX register with the value 5", "increment the EDX" register, etc.
10 Answers
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Getting error: Peer authentication failed for user “postgres”, when trying to get pgsql working with
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need to use same passwords? sudo passwd postgres
– Peter Krauss
Aug 27 '17 at 15:52
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MySQL主从服务器数据一致性的核对与修复 - 数据库(内核) - 清泛网 - 专注C/...
...性的核对与修复我上一次遇到MySQL主从服务器数据一致性问题，想想是几年前的事情了，还依稀记得当时惊慌失措的情景，好在最后借助Maatkit解决了问题。几年...我上一次遇到MySQL主从服务器数据一致性问题，想想是几年前的事...
What does the number in parentheses shown after Unix command names in manpages mean?
...es (usually found in /dev)
5 File formats and conventions eg /etc/passwd
6 Games
7 Miscellaneous (including macro packages and conven‐
tions), e.g. man(7), groff(7)
8 System administration commands (usually only for root)
9 Kernel routin...
Number of processors/cores in command line
...
The most simplest tool comes with glibc and is called getconf:
$ getconf _NPROCESSORS_ONLN
4
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Postgresql: password authentication failed for user “postgres”
...s.
If you do not have a password for the User postgres ubuntu do:
$ sudo passwd postgres
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PostgreSQL: How to change PostgreSQL user password?
... To change the password on the postgres user in Linux: sudo passwd postgres
– Punnerud
Aug 28 '19 at 6:31
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Regexp Java for password validation
...wordvalidation {
public static void main(String[] args) {
String passwd = "aaZZa44@";
String pattern = "(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{8,}";
System.out.println(passwd.matches(pattern));
}
}
Explanations:
(?=.*[0-9]) a digit must occur at...
Asynchronous vs Multithreading - Is there a difference?
... to other work while the I/O hardware (disk controller, network interface, etc.) does the I/O work. The hardware lets the CPU know when it's finished by interrupting the CPU, and the OS then delivers the event to your application.
Frequently higher-level abstractions and APIs don't expose the unde...