git

git diff

git diff --cached

git l --name-only
git status -s

git reflog expire --all --expire=now

git prune --dry-run
git fsck --unreachable

bare

non bare

clean dirty

staged

Go race conditions

A data race occurs whenever two goroutines access the same variable concurrently and at least one of the accesses is a write.It follows from this definition that there are three ways to avoid adata race.

The first way is not to write the variable - load it beforehand and only give read access.

The second way to avoid a data race is to avoid accessing the variable from multiple goroutines - a monitor goroutine which selects on multiple channels.

Even when a variable cannot be confined to a single goroutine for its entire lifetime, confinement may still be a solution to the problem of concurrent access.For example, it's common to share a variable between goroutines in a pipeline by passing its address from one stage to the next over a channel.If each stage of the pipeline refrains from accessing the variable after sending it to the next stage, then all accesses to the variable are sequential.

installing ssl certificate/enabling https on apache,amazon linux with letsencrypt

yum install mod24_ssl openssl

git clone https://github.com/letsencrypt/letsencrypt

cd letsencrypt/

./letsencrypt-auto --debug certonly --webroot -w /var/www/html/abc -d www.abc.com

Edit httpd.conf

<IfModule mod_ssl.c>

    Listen 443

</IfModule>

<VirtualHost *:443>

        SSLEngine on

        SSLCertificateFile /etc/letsencrypt/live/www.abc.com/cert.pem

        SSLCertificateKeyFile /etc/letsencrypt/live/www.abc.com/privkey.pem

        SSLCertificateChainFile /etc/letsencrypt/live/www.abc.com/fullchain.pem

        <Directory "/var/www/html/abc">

                Options Indexes FollowSymLinks

                AllowOverride All

                Order allow,deny

                Allow from all

        </Directory>

        DocumentRoot "/var/www/html/abc"

        ServerName www.abc.com

</VirtualHost>

service httpd restart

linux network load monitoring

nload

vmstat formatted

vmstat -S m

Downloading Windows 10 ISO

https://www.microsoft.com/en-in/software-download/windows10ISO

Source :

https://www.youtube.com/watch?v=9q60Vc1fjx4

Enabling hibernate in Windows 10

CTRL + X >>>> Power Options >>>> Choose what power buttons do >>>> At the bottom is Shutdown settings