IT Nursery
I have a FILE *, returned by a call to fopen(). I need to get a file descriptor from it, to make calls like fsync(fd) on it. What’s the...
I wrote a program for an assignment which is supposed to print its output to stdout. The assignment spec requires the creation of a Makefile which when invoked as...
What is the difference between read() and recv(), and between send() and write() in socket programming in terms of performances, speed and other behaviors? 9 Answers 9
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 the option of using mmap() to...
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 the firewall. I don’t understand the...
I am looking for a way to get the output of a command when it is run from within a C++ program. I have looked at using the system()...
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What is POSIX? I have read the Wikipedia article and I read it every time I encounter the term. The fact is that I never really understood what it...
In a shell script, how do I echo all shell commands called and expand any variable names? For example, given the following line: ls $DIRNAME I would like the...
What command can be used to check if a directory exists or not, within a Bash shell script? 3 36