How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?
I have a FILE *, returned by a call to fopen(). I need to get a file descriptor from it, to make calls … Read more
posix
Suppress echo of command invocation in makefile?
I wrote a program for an assignment which is supposed to print its output to stdout. The assignment spec requires the creation of … Read more
What is the Difference Between read() and recv() , and Between send() and write()?
What is the difference between read() and recv(), and between send() and write() in socket programming in terms of performances, speed and other … Read more
When should I use mmap for file access?
POSIX environments provide at least two ways of accessing files. There’s the standard system calls open(), read(), write(), and friends, but there’s also … Read more
What is /dev/null 2>&1?
I found this piece of code in /etc/cron.daily/apf #!/bin/bash /etc/apf/apf -f >> /dev/null 2>&1 /etc/apf/apf -s >> /dev/null 2>&1 It’s flushing and reloading … Read more
How do I execute a command and get the output of the command within C++ using POSIX?
I am looking for a way to get the output of a command when it is run from within a C++ program. I … Read more
How to kill all processes with a given partial name? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question … Read more
What is the meaning of “POSIX”?
What is POSIX? I have read the Wikipedia article and I read it every time I encounter the term. The fact is that … Read more
How to echo shell commands as they are executed
In a shell script, how do I echo all shell commands called and expand any variable names? For example, given the following line: … Read more
How can I check if a directory exists in a Bash shell script?
What command can be used to check if a directory exists or not, within a Bash shell script? 3 36