This simple C program will test whether it is running from a TTY or not. This is a simple test, but it could be quite useful. #include <stdio.h> #include <poll.h> #include <unistd.h> int main(int argc, char* argv[]){ struct pollfd fds[1] = {{.fd = STDIN_FILENO, .events = POLLIN}}; if (!poll(fds, sizeof(fds) / sizeof(struct … Read more
The ldd command will print out a list of all libraries that an executable is linked against. This is the output for a simple “Hello World” command. 20:15:31 tux@linux-v415 ($ ldd ./a.out linux-vdso.so.1 => (0x00007fff171ff000) libc.so.6 => /lib64/libc.so.6 (0x00007fe56ef58000) /lib64/ld-linux-x86-64.so.2 (0x00007fe56f2e8000) 20:15:49 tux@linux-v415 ($20:15:31 tux@linux-v415 ($ ldd ./a.out linux-vdso.so.1 => (0x00007fff171ff000) libc.so.6 => /lib64/libc.so.6 (0x00007fe56ef58000) … Read more
The virtual console on a Linux box is a good way to access the command line on a UNIX or Linux system. There are a few virtual consoles available on a machine. Press Ctrl-Alt-F2 to access the virtual console. Hold the Alt key and use the arrow keys to switch between virtual consoles. There is … Read more