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Cannot ping AWS EC2 instance
...
286
Add a new EC2 security group inbound rule:
Type: Custom ICMP rule
Protocol: Echo Request
Po...
Multiline bash commands in makefile
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138
You can use backslash for line continuation. However note that the shell receives the whole comm...
How to use Git Revert
...cho "bad update" > README.md
$ git commit -am "bad update"
[master a1b9870] bad update
1 file changed, 1 insertion(+), 1 deletion(-)
In this example the commit history has two commits and the last one is a mistake. Using git revert:
$ git revert HEAD
[master 1db4eeb] Revert "bad update"
1 fil...
How does the MapReduce sort algorithm work?
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Martijn Pieters♦
839k212212 gold badges32203220 silver badges28102810 bronze badges
answered Jul 20 '09 at 11:01
Yuval...
Difference: std::runtime_error vs std::exception()
...r design.
Update: Portability Linux vs Windows
As Loki Astari and unixman83 noted in their answer and comments below, the constructor of the exception class does not take any arguments according to C++ standard. Microsoft C++ has a constructor taking arguments in the exception class, but this is n...
How to take backup of a single table in a MySQL database?
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8 Answers
8
Active
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Which timestamp type should I choose in a PostgreSQL database?
... now
-------------------------------
2011-05-27 15:47:58.138995-07
(1 row)
test=> SELECT NOW() AT TIME ZONE 'UTC';
timezone
----------------------------
2011-05-27 22:48:02.235541
(1 row)
Note that AT TIME ZONE 'UTC' strips time zone info and creates a ...
How do I define global variables in CoffeeScript?
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8 Answers
8
Active
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Do I cast the result of malloc?
...tch errors).
– n. 'pronouns' m.
Dec 8 '16 at 12:30
12
Compilers have changed. An up-to-date compi...
Small Haskell program compiled with GHC into huge binary
... try
$ du -hs A
13M A
$ file A
A: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.27, not stripped
$ ldd A
linux-vdso.so.1 => (0x00007fff1b9ff000)
libXrandr.so.2 => /usr/lib/libXrandr.so.2 (0x00007fb21...