Because each step does different things Prepare(setup) environment for building ./configure This script has lots of options that you should change. Like –prefix or –with-dir=/foo. That means every system has a different configuration. Also ./configure checks for missing libraries that should be installed. Anything wrong here causes not to build your application. That’s why distros … Read more
You would have to run this as root, but: for user in $(cut -f1 -d: /etc/passwd); do crontab -u $user -l; done will loop over each user name listing out their crontab. The crontabs are owned by the respective users so you won’t be able to see another user’s crontab w/o being them or root. … Read more
Unix filesystems use reference counting and a two-layer architecture for finding files. The filename refers to something called an inode, for information node or index node. The inode stores (a pointer to) the file contents as well as some metadata, such as the file’s type (ordinary, directory, device, etc.) and who owns it. Multiple filenames … Read more
Try one of these: gdb -p 12271 gdb /path/to/exe 12271 gdb /path/to/exe (gdb) attach 12271
These days, the POSIX standard using getopt() (aka getopt(3)) is widely used as a standard notation, but in the early days, people were experimenting. On some machines, the sort command no longer supports the + notation. However, various commands (notably ar and tar) accept controls without any prefix character – and dd (alluded to by … Read more
Use the fact that awk splits the lines in fields based on a field separator, that you can define. Hence, defining the field separator to / you can say: awk -F “https://stackoverflow.com/” ‘{print $NF}’ input as NF refers to the number of fields of the current record, printing $NF means printing the last one. So … Read more
If you insist of running your script from cron: * * * * * /foo/bar/your_script * * * * * sleep 15; /foo/bar/your_script * * * * * sleep 30; /foo/bar/your_script * * * * * sleep 45; /foo/bar/your_script and replace your script name&path to /foo/bar/your_script
It’s the man page section. From memory, section 1 is user programs, 2 is system calls, and 3 is standard C library calls, and 5 is file formats. Wikipedia has the full explanation here.
The answer turns out to be quite simple: cmake needs to be told to link with the DL libs, using ${CMAKE_DL_LIBS} . So, for any target that links with a library that uses dlopen, etc, invoke: target_link_libraries(MY_TARGET LIB1 LIB2 … LIBN ${CMAKE_DL_LIBS})
I have written portable replacement for time.h (currently just localtime(), gmtime(), mktime() and timegm()) which uses 64 bit time even on 32 bit machines. It is intended to be dropped into C projects as a replacement for time.h. It is being used in Perl and I intend to fix Ruby and Python’s 2038 problems with … Read more