The following code works fine: but I want to make a generic script serve me for several sites I manage, but fails try to get Answer You can’t use variables inside the regex. You can work around this by using a RegEx backreference like so: (note the # is just used as a boundry. It could be any character …
/dev/mem and /dev/kmem not exists?
I would appreciate if some one can explain me why the two files do not exist? How Android kernel’s virtual memory space and physical space be like without have the 2 files? Edit: I am having Android 2.3.7 (Cyanogen mod), the 2 files do not exist: Edit2: I have checked the Samsung Galaxy S3 running ICS, …
Detect death of parent process
How can I detect parent process death in Linux OS? If in parent process called fork(), that create child process. In the parent process I can use system call wait() for waiting terminated child process, and getting its status. But, I can’t find info about how child process can detect parent process̵…
How to get a pointer to a specific executable file’s section of a program from within itself? (Maybe with libelf)
I’m on a Linux environment and I need to make a program that retrieves some data that is placed in one of the sections of its executable file. So, how to get a pointer to a section of a program (by its name) from within itself? I know it’s possible to use elf_getdata() passing the index of the sec…
How to check if sed has changed a file
I am trying to find a clever way to figure out if the file passed to sed has been altered successfully or not. Basically, I want to know if the file has been changed or not without having to look at the file modification date. The reason why I need this is because I need to do some extra stuff
Context switches much slower in new linux kernels
We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to believe. Let me…
Distinguish forwarding traffic and locally originated traffic in Linux network driver
Is there any information in the struct skbuff to distinguish between the forwarding traffic (bridge forwarding and ip forwarding) and locally originated traffic? We want to treat these two kinds of traffic differently in the network driver because the forwarding traffic do not require cache invalidation on th…
Track the time a command takes in UNIX/LINUX?
In UNIX/LINUX, is there an easy way to track the time a command takes? Answer Yes, use time <command>, such as Consult man time for more options. Link.
Nagios – Connection refused & Socket timeout
I need to monitor windows services(like CPU load, memory usage etc.), so I have installed Nagios monitoring tool. The installation is complete and ‘check_nt’ plugin is also installed. Upto this no error is there, but while executing scripts with agent NSClient++ ‘Connection refused by host&#…
Trying to launch an external editor from within a Go program
I am trying to figure out how to launch an external editor from within a Go program, wait for the user to close the editor, and then continue execution of the program. Based on this SO answer, I currently have this code: When I run the program, I get this: I have also tried using exec.Run() instead of exec.St…