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Showing posts from November, 2015

Linux date Command: Day of Week

To find the day of week (e.g. Friday) on a particular date using the Linux version of the `date` utility, execute:

$ date -d 'Jan 03 2004' "+%a" Sat

The -dflag tells the utility to display the information only, instead of setting the date, etc.

The "+%a" options are`date`'s FORMAT options, which are listed in the manpages.
So, for example, we can also have the full name of the weekday output by changing the "+%a" to "+%A". $ date -d 'Jan 03 2004' "+%A" Saturday
DATE(1) User Commands NAME date - print or set the system date and time SYNOPSIS date [OPTION]... [+FORMAT] ... ... FORMAT controls the output. Interpreted sequences are: %% a literal % %a locale's abbreviated weekday name (e.g., Sun) %A locale's full weekday name (e.g., Sunday) %b locale's abbreviated month name (e.g., Jan) %B locale's…

SELinux Failure after Fedora22 Upgrade

SELinux got somehow mangled during upgrade process from Fedora21 -> Fedora22. Some of the modules were changed between the versions and as a result my SELinux "system" is borked. It'd be nice to have more available documentation on re-installing and/or resetting SELinux on a system.  I can't use any of the normal tools to manage SELinux, as it only prints out errors like `libsepol.permission_copy_callback...`.  Attempting to relabel a filecontext, for example results in:

# semanage fcontext -a -t system_dbusd_var_lib_t /var/lib/dbus/machine-id libsepol.context_from_record: type radicale_port_t is not defined (No such file or directory). libsepol.context_from_record: could not create context structure (Invalid argument). libsepol.port_from_record: could not create port structure for range 5232:5232 (tcp) (Invalid argument). libsepol.sepol_port_modify: could not load port range 5232 - 5232 (tcp) (Invalid argument). libsemanage.dbase_policydb_mo…

SDL2 With Eclipse on Fedora22

On a Fedora22 system with Eclipse Mars version 4.5.1 this worked for me.

Create a new C++ project (File > New > C++ Project). You will need to pick a toolchain - Linux GCC.
If you want to use C++11 do the following:

Right click your Project under “Package Explorer” and select Properties.Select (C/C++ Build > Settings > GCC C++ Compiler > Dialect) Under “Language standard” select: "ISO C++11 (-std=c++0x)". Click Apply, then OK.
Configure Eclipse to use SDL2

At this step, I'd suggest to use the system's terminal/shell to find out or verify the existence/location of the necessary files/libraries for SDL2 on your system. 

First, if you want to find the location of the necessary libraries on your system, executing the following in the terminal will provide you with the "include" location and other compiler/preprocessor flags

$ sdl2-config --cflags
Similarly, to list the libraries/linker-flags

$ sdl2-config --libs
For example, on my Fedora22 (64bit…