Linux Shell, Awk: merge 2 variable data per column

The left part data (in variable) like : echo "$lpart" "2017-07-03 13:39:5", "-39dB", "7c:e9:d3:f1:61:55" "2017-07-03 13:39:5", "-39dB", "7c:e9:d3:f1:61:55" "2017-07-03 13:39:5"

How to generate a new terminal and execute a command on it using a shell script?

I want to run a set of commands out of which some I want to run simultaneously in another terminal using shelll script. Let's say I have the below four commands command1 command2 command3 command4 First I want to start command1 in terminal 1 & while

fatal: Lack of memory, malloc error failed on git pull on Ubuntu VM

I ran git pull on my Ubuntu VM, and I got Enter passphrase for key '/root/.ssh/id_rsa': remote: Counting objects: 7, done. remote: Compressing objects: 100% (7/7), done. remote: Total 7 (delta 4), reused 0 (delta 0) Unpacking objects: 100% (7/7), don

How to set an environment variable in Apache (or OS) and get the value in PHP?

I made sure the env module was installed: a2enmod Your choices are: access_compat ... Which module(s) do you want to enable (wildcards ok)? env Module env already enabled I tried setting an environmental variable in "/etc/apache2/apache2.conf" f

grep, how to search for an exact pattern?

This was what I have tried grep -n 'qtrain' *.m But I got also SKSC.m:195:model.qtrain = model.qtrainExtra(:,k-1); SKSC.m:196:model.mqtrain = model.mqtrainExtra{k-1}; SKSC.m:197:model.sqtrain = model.sqtrainExtra{k-1}; How to get rid of the others? I

Linux command How to delete everything with the extension .html

i am using putty, want to delete all files which having .html extension I am trying the below ways 1st get the file by using find command find . -name "*.html" -type f Listing all files having .html extension now i am going to delete those files

Check the execution status of a background process launched from the same bash script

I have to write a bash script that launches a process in background in accordance to command line argument passed and returns if it were successfully able to run launch the program. Here is a pseudo code of what I am trying to achieve if [ "$1"

unable to execute the Perl script, use the command not found?

I have an xml file (client_23.xml) in which I need to add few lines at a particular section basis on what is there in other xml file (abc_lop.xml). Here is my abc_lop.xml file in which you see I have lot of ClientField lines with name, pptype and dat

Cmake generated the Eclipse project - No source

I am attempting to use CMake to generate eclipse project files. Although I am able to build successfully, I am unable to browse or edit the source in eclipse. This is an out of tree build, where my build directory is at the same level as my source di

c ++ trying to add Peterson's algorithm to avoid competitive conditions in shared memory

I have written two program (program 1 and program 2) to communicate with each other using shared memory. program 1 reads from a file a sentence and pass it after modification to get first letter of each word and its size to the next program ( program

select a file from a number and keep only the lines starting with that number in linux

I have files with the format given below. Please note that the entries are space seperated. 16402 8 3858 3877 3098 3099 3858 -9.0743538e+01 1.5161710e+02 -5.4964638e+00 3244 -9.7903877e+01 1.8551400e-13 1.0194137e+01 3877 -9.2467590e+01 1.5160857e+02

Dd does not work properly?

I'm not too familiar with Linux so please forgive the ignorance. I'm trying to dump a file to a virtual floppy disk using the command: dd if=a.out of=image bs=1024 count=1 conv=notrunc It creates the image file with the exact same size of a.out (1kB)

Why is the sudo: bundle command not found?

Why is command "bundle" not found when using sudo: [root@desktop gitlab]# sudo -u git -H bundle exec rake gitlab:setup RAILS_ENV=production sudo: bundle: command not found [root@desktop gitlab]# but does exist when not using sudo: [root@desktop

Ubuntu - too many open files?

I have a websocket service. it's strage that have error:"too many open files", but i have set the system configure: /etc/security/limits.conf * soft nofile 65000 * hard nofile 65000 /etc/sysctl.conf net.ipv4.ip_local_port_range = 1024 65000 ulim

Reads lines from file and writes directly to FIFO, without buffering in RAM

I have a file with very, very long lines. A single line will not fit in memory. I need to process each line separately, so I'd like to write each line to a FIFO node, sending EOF between lines. This model works well for what I'm doing, and would be i

Where to put shell script / function? .bashrc or bin?

I am learning Linux commands and I learnt that you can write a shell script and put in a customized directory (e.g. ~/bin/ ) and export to $PATH or you can write it as a shell function and put in .bashrc file. If I may ask, what is the right situatio

Unix & amp; gnu / linux distributions: possible locations for the 'which' command?

Would like to reference the full path to the which command as an improvement to some shell scripts. Is anyone aware of a standard location for some unix gnu/linux distribution BESIDES /usr/bin/which?which is not a standard part of linux systems. It's

Shell script for monitoring CPU load

I am looking for a script which does monitor the cpu usage per day. All the scripts that I have come across does kind of real time monitoring and send an email if it meets certain aspects like the load increasing beyond 80%. Is it possible to monitor

Save the output of the time command in a log file

I have a script hex.bat that has: #!/bin/bash HEX_ROOT=. HEX_COLOURS=./data HEX_PDB=. HEX_MACROS=. HEX_CACHE=./data time ./hex6i.x64 -kill -nogui -ncpu 1 -ngpu 1 -e dock.mac -l job.log All the output goes to job.log, except the time. I want to save i

Prevent getpeername () from returning 127.0.0.1

I have a Server (A) and a client (B), written in C, running on the same Linux machine. The server binds a port to INADDR_ANY, and the client binds another port to INADDR_ANY. When another client (C), which is running on another Linux machine, connect

Why my core file is not overwritten?

On Ubuntu 12.04, open a new text file and write: #include <stdlib.h> int main() { abort(); return 0; } Now run: g++ yourfile.cpp Then run the executable, which will core dump: ./a.out Now check the mtime of the file: -rw-r----- 1 xxxxx xxxxx 228K 20

Java, Mac OS, Windows and Linux

I have migrated from Linux (Ubuntu) to Mac OS. I have wrote an application in Java (swing). I have run it successfully the same code in windows and linux but in mac os I have some problems. Here is the code and problems in comments: public MainForm()

AVR ISP MKII, avrdude, Ubuntu 11.10

So, I have had this working on Ubuntu before. But then I upgraded to 11.10. Now, no such luck. Note: if you are still messing with getting this to work on eclipse, you might want to try this command line stuff... if it doesnt work here, its not going

How can I debug a function in a particular file of a running application using gdb?

I have made an application in which there is a file main.c which uses a function from the master.c file. I would like to debug my application for all functions defined in the master.c file by using gdb tool. Is this possible and if so how?You must co

Understand the linux planner

I am new to linux kernel and low level programming. I wanted to know how linux scheduler is supposed to be O(1) in time complexity. I came across the following article which is very informative but I have a problem understanding the pargraph I have r

signal queued in C

I have a simple program under Linux which sends SIGUSR1 signal to its child process in a cycle. But when I send e.g. 10 signals, sometimes happens, that the child received only 3 of them. Last sent signal is always SIGUSR2 and that is received every

Is there a good reason to write my own daemonize function instead of using daemon (3)?

There are a lot of example implementations of daemons on the net. Most that I saw do not use the daemon(3) function to run the program in the background. Is that just a matter of taste, ignorance, or is there a good reason to write my own daemonize f

Best / best way to analyze configuration settings in Sh / Bash and php

I got in every php project (around 25!), some sh scripts that help me with routine tasks such as deployment, repo syncronizing, databases exporting/export, etc. The sh scripts are the same for all the projects I manage, so there must be a configurati

Search and copy a string in the HTML code

I'm trying something new, I would normally do this in C# or VB. But for speed reason I'd like to do this on my server. Open File terms.txt Take each item one at a time from terms.txt and open a url (possibly curl or something else) and go to http://s

Can I reliably create Excel documents from a PHP application on a Linux server?

What is the state generating Excel documents from a PHP application on a Linux server? I am interesting in creating Office 97 (xls) Excel files. My limited research on the subject has turned up this Pear package. It appears to be in beta status since