I am struggling to understand how to set a variable to be a particular timestamp. given dt which is the current date, say 2016-05-11 17:10:00, i want to create another date variable that is (roughly) 9 hours after dt, and on the exact hour, i.e., 2016-05-12 02:00:00. In other words, I would set the new date t…
Linux screen snapshot/redirect
Is it possible to take a “snapshot” of a running screen command, either stored as text or an image? Something akin to the following: Answer It’s possible to take so called “hard copy” of a screen session: Here we send hardcopy hc.n command to screen session 11534.test. The sessio…
link files within directory, with simple command similar to cp
Where my question originated: When running cp source/files.all destination/, all the files within source will now also exist in destination Question: What if I didn’t want to duplicate the data from source into destination, but simply link them (with absolute path). Usually, I would run something like: …
Why is sys_fork not used by glibc’s implementation of fork?
In eglibc’s nptl/sysdeps/unix/sysv/linux/i386/fork.c there’s a definition: which is used in actual __libc_fork() as the heart of the implementation. But e.g. in Linux’s arch/x86/entry/syscalls/syscall_32.tbl exists a sys_fork entry, as well as in syscalls_64.tbl. So apparently Linux does hav…
Compressing ZIP files in a linux server with PHP
I am trying to create a .zip file of a folder in linux. First I go where the compressed folder is: The folder test has the folder testzip which should be zipped and sent somewhere else: This should create testzip.zip. Somehow this doesn’t work. Could anyone help? Answer Try with instead of — EDIT …
OpenCV: Detecting cat with specific color. Trivial?
I have a problem with my cat being bullied by a nabouring cat to the extent that the cat enters our house in the summer and eat our cats food and sleeps in our furniture. My cat is gray and the problem cat is brown. I would like to make an alert system using a WiFi action cam and OpenCV
How i can execute command in linux terminal without using space?
How i can execute command in linux terminal without using space? example: cat text.log -> cat${space_code}text.log Answer Brace expansion can help you to construct complex bash commands without the use of spaces:
Setup makefile for ‘path agnostic’ inclusions
In my project files I just want to be able to say: main.cpp: When these headers files reside in separate I’ve setup my make file to attempt to achieve this but I still get fatal error: foo.h: No such file or directory so I haven’t been able to set it up correctly. Makefile: Is LIBS correct? How ca…
Compiler says uuid.h not found but apt-get says it is
When compiling my C++ project that includes uuid.h I get the compile error: fatal error: uuid.h: No such file or directory I’m not sure whats going wrong. It could be my compiler instructions are wrong or that I indeed dont have that file installed (but I don’t think thats the problem). sudo apt-g…
The first character in the output stream is replaced with the last character of that stream which is removed. Why is that so?
Program’s Aim: The program is a hangman game which get a list of planets from our solar system, saves it to an array then randomly selects one word from the array and subsequently prints two letters of the word on the board. The program runs perfectly in a windows environment, but fails in runtime on li…