I am trying to connect Arduino using java program and it gives out error when sending data from the pc to arduino from a serial-connection and the program crashes And these are my initialization methods and send methods for serial Initialization of Serial Connection Sending data via Serial Connection Serial c…
Tag: linux
Running a bash install script as root – how to handle regular users’ files?
I am writing some bash scripts to install and configure some programs. Because the script needs to install packages – I run the scripts as root – which itself is no problem (i.e. I have root privileges etc). However once the packages are installed the script needs to configure normal user files an…
C++ Sockets – Client gives segmentation fault (linux)
I created a server/client connection. The server and client both are compiling correctly but when I run the client, it gives me a Segmentation Fault (core dumped) I don’t know what I am doing wrong with my memory allocations. The program is not dangling or anything. I think my program is writing to a re…
file_get_contents() security issue on local domain only with CentOS security settings
I know there are a hundred posts about file_get_contents() on SO but nothing seems to solve my problem: Everything was working fine fifteen minutes ago, until I ran some security stuff via SSH. I added some iptables rules and I file_get_contents and I ran service proftpd restart and a few installs/uninstalls …
How to echo a dynamic variable’s content in shell script
How to echo a dynamic variable’s content in shell script ? Current output: Desired output: Answer Use eval:
ps command -o option gives “ERROR: Garbage option”
I have 2 suse-11 machine both has same kernel version. Linux version 2.6.32.59-0.7-default (geeko@buildhost) (gcc version 4.3.4 [gcc-4_3-branch revision 152973] (SUSE Linux) ) #1 SMP 2012-07-13 15:50:56 +0200 but in one machine below command works ps -u test-o ‘%U %p %P %c’ but in other gives erro…
what is the meaning of the lost+found directory on linux [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack …
Regext to match only ONE occurance of a pattern
How to write a regex that says that given pattern is present ONLY once? for e.g.. if am searching for pattern ‘file’, Answer You could use a negative lookahead: Test at regex101 You may apply the above regex in grep. The negative lookahead assertion at ^ start (?!(?:.*?file){2}) looks ahead, if th…
std::u32string conversion to/from std::string and std::u16string
I need to convert between UTF-8, UTF-16 and UTF-32 for different API’s/modules and since I know have the option to use C++11 am looking at the new string types. It looks like I can use string, u16string and u32string for UTF-8, UTF-16 and UTF-32. I also found codecvt_utf8 and codecvt_utf16 which look to…
Bash: multiple redirection
Early in a script, I see this: And later: My understanding of this looks something like this: Create fd 3 Redirect fd 3 output to stderr (Upon app execution) redirect stdout to fd 3, then redirect stderr to stdout Isn’t that some kind of circular madness? 3>stderr>stdout>3>etc? I’m esp…