Determine parent shell from perl -

-

from perl know name (and possibly path) of shell started perl process.

$env{shell} not give (it gives login shell - current perl process might started different shell).

the best answer have found far is: http://www.perlmonks.org/?node_id=556926 deals terribly different platforms (the output of 'ps' differs wildly platform platform).

i tried looking @ %env, contains exported variables.

so there better way?

background

this used gnu parallel: every job started through shell. give least surprise user, shell should same shell gnu parallel started from. way tcsh-user able run tcsh commands gnu parallel , same bash/zsh/*sh user.

currently $shell used, gives login shell , not current shell surprising users, run different shell login shell. can cause problems if gnu parallel used in script written tcsh-user, run bash-user.

if gnu parallel not started shell, default $shell (same now).

how this:

#!/usr/bin/env perl  use strict; use warnings; use feature 'say';  use proc::processtable;  $t = proc::processtable->new;  $current_pid = $$; @parents;  # loop on process table until we've found parents perl pid # init (process id 1) while ($current_pid != 1) {     $process (@{ $t->table }) {         if ($process->pid == $current_pid) {             push @parents, $process;             $current_pid = $process->ppid;         }     } }  # loop on parents we've found , looks # shell command $process (@parents) {     $cmd = $process->cmndline;      if ($cmd =~ m/sh$/) {         $cmd;         last;     } }

Comments

Post a Comment

Popular posts from this blog

c++ - OpenCV Error: Assertion failed <scn == 3 ::scn == 4> in unknown function, -

-
i read alot other solution still confused should mine... #include <opencv2/objdetect/objdetect.hpp> #include <opencv2/highgui/highgui.hpp> #include <opencv2/imgproc/imgproc.hpp> #include <iostream> #include <stdio.h> using namespace std; using namespace cv; int main(int argc, const char** argv) { //create cascade classifier object used face detection cascadeclassifier face_cascade; //use haarcascade_frontalface_alt.xml library face_cascade.load("haarcascade_frontalface_alt.xml"); //setup video capture device , link first capture device videocapture capturedevice; capturedevice.open(0); //setup image files used in capture process mat captureframe; mat grayscaleframe; //create window present results namedwindow("outputcapture", 1); //create loop capture , find faces while (true) { //capture new image frame capturedevice >> captureframe; ...
Read more

php - render data via PDO::FETCH_FUNC vs loop -

-
i've been using 2 methods render data. the first one: function name($id,$name){ return '<div id="'.$id.'">'.$name.'</div>'; } echo implode($pdo->query("select id,name user")->fetchall(pdo::fetch_func,'name')); the second one: $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); foreach($users $user){ echo name($user->id,$user->name); } i don't understand how pdo::fetch_func works. tried figure out. however, not well-documented. could please explain fetch mode? , also, 1 performs better? thank you. both methods wrong , have learn how use templates , how separate business logic presentation logic. $users = $pdo->query("select id,name user")->fetchall(pdo::fetch_obj); tpl::assign('users', $users); is code business logic part. then in template <?php foreach $users $row): ?> <div id="<?=$...
Read more

The canvas has been tainted by cross-origin data in chrome only -

-
uncaught securityerror: failed execute 'getimagedata' on 'canvasrenderingcontext2d': canvas has been tainted cross-origin data i getting above error in chrome. code(following) works fine in mozilla. have not corss domain issue. why above error in chrome? var wheel_canvas, wheel_context, can_w, can_h, wheel_grd; var large_radius = 160; var small_radius = 120; var wheel_canvas = document.getelementbyid('wheel_canvas'); var wheel_context = wheel_canvas.getcontext('2d'); var can_w = $(wheel_canvas).width(); var can_h = $(wheel_canvas).height(); var centerx = can_w / 2, centery = can_h / 2; var wheel_grd = null; test('#ff0000'); function test(hex) { $('#clrpicker').css({'left': 210, 'top': 210 }); inverted = hexbw(hex); $('#color_val_show').val(hex); current_color_hex_val_selected = hex; $('#color_val_show').css({'color':inverted,'background':hex}); fillgradient...
Read more