I’m writing a wrapper command that invokes a child process, waits for it to exit, and propagates its exit code. Simple enough. I want to propagate the exit status of the child process to my own process’s exit code even if the child exited with a signal. If WIFSIGNALED(cmdret) is true for some int cmdret… Read More Propagate WTERMSIG exit code from child process on exit
My program (a text editor) enters raw mode of terminal like this: tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) so that it can read key strokes, draw using escape codes etc. But now I want to do this: echo hello | myprog, to read stdin from a pipe and then display it in the program UI. But now STDIN_FILENO… Read More get fd of terminal when a destination of pipe
I think the two commands below should be identical, but given the heredoc, the shell produces an error. Is it possible to pass a heredoc to the -c argument of sh? heredoc example /bin/sh -c <<EOF echo ‘hello’ EOF # ERROR: /bin/sh: -c: option requires an argument simple string example /bin/sh -c "echo ‘hello’" #… Read More sh -c doesn't recognize heredoc syntax
I have stuck with my bash code. and needed some help. I trying to write bash code that : Length – minimum of 10 characters. Contain both alphabet and number. Include both the small and capital case letters. Color the output green if it passed the validation and red if it didn’t. Return exit code… Read More Bash Password validator
let’s say I have a char* ./a.out\0a\0b\0\0. I want to split it and the result to be a char** of value { "./a.out\0", "a\0", "b\0", "\0" } I’m using pure c + POSIX but if an answer contains parts of the c++STL I don’t mind that, just avoid the memory inefficient ones like std::string >Solution… Read More splitting a string using '\0'
Input file <a href="perl.html">perl</a> <a href="http://zoidberg.sourceforge.net/out.html">http://zoidberg.sourceforge.net</a> <a href="zoiduser.html">zoiduser</a> <a href="perl.html">perl</a> <a href="http://zoidberg.sourceforge.net/sample.html">http://zoidberg.sourceforge.net</a> I need to only remove .HTML extension from below URL from above file: <a href="perl.html">perl</a> <a href="zoiduser.html">zoiduser</a> So that the final output should look like: <a href="perl">perl</a> <a href="http://zoidberg.sourceforge.net/out.html">http://zoidberg.sourceforge.net</a> <a href="zoiduser">zoiduser</a> <a href="perl.html">perl</a> <a href="http://zoidberg.sourceforge.net/sample.html">http://zoidberg.sourceforge.net</a> This is what I am doing: sed ‘/"http\|"www\|"mailto/… Read More sed to ignore a pattern as well as match a pattern in same line
I’m looking to change the value of a key in a json file Example: "House":"sample.house.city" Need to change the word "sample" to something else. I can do this with: sed -i ‘s|sample.house.city|town-home.house.city|g’ file.json but there is no guarantee that "sample" is going to be the same every time. I’ve tried: sed -i ‘s|*.house.city|town-home.house.city|g’ file.json but… Read More sed replace * in url with text in json file
After running: g++ –std=c++11 -ansi -pedantic-errors -Wall -o test_database test_database.cpp I am receiving the following errors: ./database.h:40:10: error: ‘auto’ type specifier is a C++11 extension [-Werror,-Wc++11-extensions] for (auto x:composerMap_) { ^ ./database.h:40:16: error: range-based for loop is a C++11 extension [-Werror,-Wc++11-extensions] for (auto x:composerMap_) { Yet note that I have already added the ‘–std=c++11’ flag… Read More Running into "error: […] is a c++ extension"
I have a dataset in which "-2" or "-1" stands for NA. I am capable to recode every single column that way, but I fail to do it efficiently across the whole dataset. I know there is probably an easy solution to the problem, but so far I did not find one. Can anyone help… Read More How to code values across the whole dataset as NA
I tried to write a simple C producer-consumer program using POSIX Thread, a library for working with threads. The code has a global queue from where threads exchange information. The queue has been tested and should work correctly. There are also two threads involved: Producer. Generates a random number and puts it in a queue;… Read More POSIX Thread. Why is the producer-consumer program terminated?