Accessing the IP address of a connecting SSH client is possible via environment variables (such as SSH_CONNECTION), as described in Find the IP address of the client in an SSH session In a GNU screen session though, those environment variables are defined by whoever started the screen to begin with. Is there …
Tag: linux
Linux or Mac: merging columns from different files mixes the columns
I am trying to use “paste” command to merge columns from few files but it makes a bad merge as follows. I appreciate your help. File1.csv: A 2 B 3 C 4 File2.csv: AA 6 BB 8 CC 2 output expected(required): A 2 AA 6 B 3 BB 8 C 4 CC 2 The command I used: also used output.csv(wrong output t…
what does -d value in an if expression in shell?
I am trying to understand a part of search function written in a piece of code below is the expression mentioned. Answer You can use it to determine if a directory exist like
bash: daemonizing by forking process as a new child
I have a bash script which should daemonize itself after being run. My solution looks as follows: However, putting the whole script itself inside the function child does not seem the correct thing to do. Unfortunately exec & won’t fork-off the whole process into a backgrounded child. How can a achie…
Serial data over UART gets corrupted
I’m developing an application for a development board (Beagle Bone Black) that will send some data over UART peripheral. The developing board runs Linux Kernel (some Debian distribution, 3.8.x Linux Kernel version). For sending and receiving data over UART I use the standard UNIX API: open(), read(), an…
SSH to AWS EC2 issue – key_load_public: No such file or directory [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 …
How can I match this pattern of file name in a directory, and output the matched?
there are many of files in this directory: and i want to make a list which just contains those files which have the pattern of: to match the file names such like: how can I use regexp to achieve this goal? Maybe we can use this syntax: Answer In regexp land, many roads lead to rome. 🙂 ^ marks the
Accessing files outside the root directing
My client asked me to do a website where a user can enter a path on the machine, PHP should scan the path and load all the media files in the directory and subdirectories. The user can enter any path, Desktop, or external drives, whatever, outside the root directory. That’s what the client wants and he&…
C++ linux install executable file on deploy environment
Hello every one i need to deploy linux(centos) c++ project with make file or script. By one makefile or script install dependency and project executable binary. my dependency applications libboost-devel,gcc-g++ and pcre. my excuteble binary file is run_excute Answer Yip sure – put the below commands int…
Is there any merit about assembly language? [closed]
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago. Improve this question I heard some of developers use assembly language in embedded system. …