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Using G++ to compile multiple .cpp and .h files
...ng "make" without params would use it
all: executable1
# for C++, replace CC (c compiler) with CXX (c++ compiler) which is used as default linker
CC=$(CXX)
# tell which files should be used, .cpp -> .o make would do automatically
executable1: file1.o file2.o
That way make would be properly rec...
Inline comments for Bash?
... something like that, but I think it's as good as we can get without complicating things a lot. To me it's a sign that one needs a better language, but it can do great, maintaining the already built code with such 'coments' to document it.
– Rafareino
Sep 13 '1...
How to take column-slices of dataframe in pandas
...
2017 Answer - pandas 0.20: .ix is deprecated. Use .loc
See the deprecation in the docs
.loc uses label based indexing to select both rows and columns. The labels being the values of the index or the columns. Slicing with .loc includes the last element.
Let'...
How to emulate C array initialization “int arr[] = { e1, e2, e3, … }” behaviour with std::array?
...ay, here's a test:
auto q = make_array(make_array(make_array(std::string("Cat1"), std::string("Dog1")), make_array(std::string("Mouse1"), std::string("Rat1"))),
make_array(make_array(std::string("Cat2"), std::string("Dog2")), make_array(std::string("Mouse2"), std::string("Rat2")...
How to read from a file or STDIN in Bash?
...
Here is the simplest way:
#!/bin/sh
cat -
Usage:
$ echo test | sh my_script.sh
test
To assign stdin to the variable, you may use: STDIN=$(cat -) or just simply STDIN=$(cat) as operator is not necessary (as per @mklement0 comment).
To parse each line fro...
What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
...I, and even for Linux it's informative not normative. (But it is in fact accurate.)
This 32-bit int $0x80 ABI is usable in 64-bit code (but highly not recommended). What happens if you use the 32-bit int 0x80 Linux ABI in 64-bit code? It still truncates its inputs to 32-bit, so it's unsuitable f...
How to make “if not true condition”?
I would like to have the echo command executed when cat /etc/passwd | grep "sysa" is not true.
6 Answers
...
File content into unix variable with newlines
...ive the result you want. See the following transcript for a demo:
pax> cat num1.txt ; x=$(cat num1.txt)
line 1
line 2
pax> echo $x ; echo '===' ; echo "$x"
line 1 line 2
===
line 1
line 2
The reason why newlines are replaced with spaces is not entirely to do with the echo command, rather...
return statement vs exit() in main()
...ution when favoring exit over return.
http://groups.google.com/group/gnu.gcc.help/msg/8348c50030cfd15a
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Python concatenate text files
...e ['file1.txt', 'file2.txt', ...] . I want to write a Python script to concatenate these files into a new file. I could open each file by f = open(...) , read line by line by calling f.readline() , and write each line into that new file. It doesn't seem very "elegant" to me, especially the part w...