gzip -dc boot/berryboot.img | sudo cpio -iuvdm -D berryboot(C="${PWD}"; cd berryboot; sudo find . | sudo cpio -ov --format=newc | gzip -9 >"${C}"/berryboot.img)
Mohan Raman mohan43u
mohan43u
/ meeting-minutes-sh-posix-sell-session-day-3-july-2020
Created
July 8, 2020 17:39
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| 2020-07-08 16:58:48 +mohan43u-we good evening to all | |
| 2020-07-08 16:58:58 +mohan43u-we welcome to day 3 of 'sh' Posix Shell session | |
| 2020-07-08 16:59:27 +mohan43u-we before we begin, if you are using 'webchat.freenode.net' you can hide join/part messages | |
| 2020-07-08 16:59:41 +mohan43u-we the instruction is provided in the 'training.ilugc.in' page | |
| 2020-07-08 16:59:58 +mohan43u-we also we have a new practice server. IP address got changed | |
| 2020-07-08 17:00:17 +mohan43u-we so make sure you login to the correct server to practice | |
| 2020-07-08 17:00:29 +mohan43u-we without further delay, lets start | |
| 2020-07-08 17:01:18 +mohan43u-we yesterday we learnt about man command, manual pages and howto execute more than one command with ';', '&&' and '||'combination | |
| 2020-07-08 17:01:28 +mohan43u-we today, we will start with redirection | |
| 2020-07-08 17:02:02 +mohan43u-we as I explained earlier, a command have "--options", "[args]' arguments, as well as it give returncode when it exits |
mohan43u
/ meeting-minutes-sh-posix-sell-session-day-4-july-2020
Created
July 15, 2020 01:29
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| 2020-07-09 16:58:39 +mohan43u-we #ilugc channel is now in restricted mode | |
| 2020-07-09 16:59:51 +mohan43u-we type '/msg mohan43u-we message' if you want to say something important | |
| 2020-07-09 17:00:46 +mohan43u-we good evening to all | |
| 2020-07-09 17:01:06 +mohan43u-we welcome to Day 4 of sh Posix shell session | |
| 2020-07-09 17:01:46 +mohan43u-we we will continue from where we left yesterday | |
| 2020-07-09 17:02:09 +mohan43u-we just a rewind, yesterday we looked into redirection, pipes, normal and environment variables | |
| 2020-07-09 17:03:10 +mohan43u-we our next topic is control structures, like 'if' elif etc., | |
| 2020-07-09 17:04:08 +mohan43u-we before going into the topic, just want to let you guys how to disable that joined/left messages in the irc chat | |
| 2020-07-09 17:05:00 +mohan43u-we if you are joining #ilugc through webchat.freenode.net, follow https://pasteboard.co/JgGXsrf.gif this link to disable join/part messages | |
| 2020-07-09 17:05:09 +mohan43u-we now, coming to the topic |
mohan43u
/ meeting-minutes-sh-posix-sell-session-day-5-july-2020
Created
July 15, 2020 01:32
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| 2020-07-10 17:00:20 +mohan43u-we good evening all | |
| 2020-07-10 17:00:37 +mohan43u-we welcome to Day 5 of 'sh' Posix shell Session | |
| 2020-07-10 17:01:17 +mohan43u-we I hope all of you who joined #ilugc through webchat followed https://pasteboard.co/JgGXsrf.gif link to disable join/part messages | |
| 2020-07-10 17:02:10 +mohan43u-we yesterday we saw variables, if-elif, case, for, while control structures | |
| 2020-07-10 17:02:42 +mohan43u-we also we saw how variable get expanded by shell before executing command, different types of variable expansion | |
| 2020-07-10 17:02:55 +mohan43u-we we also saw arithmetic expansion, command substitution | |
| 2020-07-10 17:03:23 +mohan43u-we we also looked into special built-in variables shell provides like $$, $!, $? etc., | |
| 2020-07-10 17:04:10 +mohan43u-we today, we will look into functions, positional parameters | |
| 2020-07-10 17:04:15 +mohan43u-we let see function | |
| 2020-07-10 17:04:46 +mohan43u-we a function in shell is nothing but another built-in command which you write, instead of shell providing |
mohan43u
/ unpack-repack-initramfs-raspberrypi.md
Created
August 18, 2020 08:03
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| /* compile: gcc -pthread -o spmc spmc.c */ | |
| #define _GNU_SOURCE | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <unistd.h> | |
| #include <pthread.h> | |
| #include <errno.h> | |
| #include <signal.h> |
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| +static void mkdirpath(const char *path, mode_t mode) { | |
| + char *d = NULL; | |
| + char *i = NULL; | |
| + | |
| + if(path == NULL) return; | |
| + d = strdup(path); | |
| + i = d; | |
| + while(i != NULL) { | |
| + if( *i == '/') i++; | |
| + i = strchr(i, '/'); |
mohan43u
/ gist:7e4cc06226f90225aded5910496498e9
Created
June 12, 2021 13:51
systemd-networkd-june-ilugc-meet.chatlog
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| 2021-06-12 15:06:43 mohan43u-we systemd-networkd is part of systemd framework | |
| 2021-06-12 15:07:01 mohan43u-we systemd is the init system in modern linux | |
| 2021-06-12 15:07:30 mohan43u-we apart from init functionality, systemd is capable of doing lot of other things in order to make a linux os usable | |
| 2021-06-12 15:07:46 mohan43u-we one of that functionality is to configure network interface | |
| 2021-06-12 15:08:16 mohan43u-we you can configure a network interface through many ways | |
| 2021-06-12 15:08:55 mohan43u-we as you see in the presenter terminal (in https://meet.ilugc.in), the command 'ip link' will show all the currently available network interfaces | |
| 2021-06-12 15:09:16 mohan43u-we there are physical interfaces as well as virtual network interfaces | |
| 2021-06-12 15:09:37 mohan43u-we you can configure a network interface either static or dynamic | |
| 2021-06-12 15:10:29 mohan43u-we as you see in the presenter terminal, I'm currently showing details about one physical network interface called eth0 | |
| 2021-06-12 15:10:49 mohan |
mohan43u
/ ta-remington.mim
Last active
June 28, 2021 12:24
Remington typewriter layout (save it under /usr/share/m17n and restart your computer)
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| ;; ta-remington.mim -- Tamil input method for Remington typewriter layout | |
| ;; Copyright (c) 2021 Mohan R, Kaniyam Foundation <https://kaniyam.com>. All Rights Reserved. | |
| ;; This file is part of the m17n contrib; a sub-part of the m17n | |
| ;; library. | |
| ;; The m17n library is free software; you can redistribute it and/or | |
| ;; modify it under the terms of the GNU Lesser General Public License | |
| ;; as published by the Free Software Foundation; either version 2.1 of | |
| ;; the License, or (at your option) any later version. |
mohan43u
/ podman-demo-Dockerfile
Created
July 10, 2021 15:03
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| FROM alpine | |
| RUN echo -e '#!/bin/sh\n\ | |
| apk update\n\ | |
| apk upgrade\n\ | |
| apk add python3\n\ | |
| mkdir -p /var/www/helloworld\n\ | |
| echo "<html><head><title>Hello World</title><body><h3>Hello World</h3></body></html>" >/var/www/helloworld/index.html' >/tmp/script &&\ | |
| chmod 755 /tmp/script &&\ | |
| /tmp/script |
mohan43u
/ ilugc-meet-10-07-2021.chatlog
Created
July 10, 2021 15:16
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| 2021-07-10 15:05:22 mohan43u-we hi all | |
| 2021-07-10 15:05:39 mohan43u-we welcome to ILUGC july month meet for the year 2021 | |
| 2021-07-10 15:06:06 mohan43u-we Im mohan | |
| 2021-07-10 15:06:24 mohan43u-we the first talk is about rootless containers | |
| 2021-07-10 15:06:41 mohan43u-we lets first talk about containers | |
| 2021-07-10 15:07:07 mohan43u-we to learn containers, we need to first learn about an old command called chroot | |
| 2021-07-10 15:07:52 mohan43u-we if you read 'man chroot' you will learn how it changes the root directory of a process | |
| 2021-07-10 15:08:14 mohan43u-we every process have a root file system view (the word view is important) | |
| 2021-07-10 15:08:56 mohan43u-we normally in unix, every process see root as same | |
| 2021-07-10 15:09:41 mohan43u-we I hope everyone joined to this meet can see my terminal either through https://meet.ilugc.in or trough jitsi |