Hide shadow or margin under react native header

 In old <5 react native you could just hide using shadowOpacity (iOS) or elevation (Android). This is not anymore valid in React >= 6.

For this you need to use headerShadowVisible for both iOS and Android.

An example is below:

<Stack.Navigator screenOptions={{
        headerStyle: {
            backgroundColor: Colors.light.tint,
            
        },
        headerShadowVisible: false,
        headerTintColor: Colors.light.background,
        headerTitleAlign: "left",
        headerTitleStyle: {
            fontWeight: 'bold',
        }
    }}>

tabBarOptions - deprecated in React Native 6 - No overload matches this call.

Fix by using screenOptions as described below:

<MainTab.Navigator
      initialRouteName="TabOne"
      screenOptions={{
        tabBarActiveTintColor: Colors[colorScheme].background,
        tabBarStyle:{
          backgroundColor: Colors[colorScheme].tint,
        }
      }}>

Fix Error: EMFILE: too many open files

Exact error is this:

 Error: EMFILE: too many open files, watch
    at FSEvent.FSWatcher._handle.onchange (internal/fs/watchers.js:203:21)

 

To fix it, please just install watchman on your Linux/OS X system:
 

brew install watchman

Fix watchman install ERROR: The following formula cannot be installed from bottle and must be built from source

To overcome this issue on Mac OS X, simple install the Command Line Tools using the below command:

  xcode-select --install

Automatic renew letsencrypt SSL certificate every 3 months

1. Create a simple script to renew and restart Apache httpd server:

[user@scripts]# cat renew-easy-certificates.sh

certbot certonly --webroot -w /var/www/html/easybiny/price -d price.easybiny.com
certbot certonly --webroot -w /var/www/html/easybiny/prod -d easybiny.com
service httpd restart

 

2. Open crontab scheduler

crontab -e 

 

3. Add the following under crontab scheduler:

0 0 1 */3 * sh /path/scripts/renew-easy-certificates.sh

This runs every 3 months on the first day of each month at 00:00. Certificates are now automatically renewed.

Fix npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/npm/node_modules/abbrev'

 Run the following command and it works just fine (tested on OS X) :

sudo npm install --unsafe-perm -g expo-cli

 

For uninstallting expo-cli, following command can be used:

sudo npm uninstall --unsafe-perm -g expo-cli --save

Verify if node.js is installed

 From a terminal, run the following command. It shall tell node.js installed version:

MacBook-Pro ~ % node -v

v14.18.0

Loop timeout delay in Browser Console

Below code will iterate from 1 to 10 with a delay of 1 second (1000 ms) between each iteration.

function loopFinish() {
   console.log('All is complete');
}
for(let i = 1; i < 11; i++) {
   setTimeout(()=>{
      console.log("Iteration number: "+i);   
      if(i === 10){
         setTimeout(loopFinish, 1000);
      }
   },i * 1000);
}

 Output would  be in the console browser:

Iteration number: 1
Iteration number: 2
Iteration number: 3
Iteration number: 4
Iteration number: 5
Iteration number: 6
Iteration number: 7
Iteration number: 8
Iteration number: 9
Iteration number: 10
All is complete

 

Royal TSX Items do not show and only "Filtered by: Favorites" show up

 As per:

https://support.royalapps.com/support/solutions/articles/17000065344-where-are-my-documents-stored-

Follow those simple steps to solve it:

You accidentally activated "Show only Favorites" but don't have any favorites
Solution: Disable "Show only Favorites" by clicking the yellow star button in the bottom left corner of the navigation panel (sidebar)

 

 

Cisco VPN connection slow on Archer C80 TP Link router

 All I needed to do is to update router firmware to latest version available - in my case this is 1.5.7:

Advanced -> System -> Firmware Upgrade

 

Please also note that for VPN to work, following need to be checked:

 

Lets encrypt - Add multiple domains to one certificate

 It's very simple, just use the following command to generate the certificate with as many domains as needed (two in the below example):

certbot certonly --webroot -w /var/www/html/easybiny/price -d price.easybiny.com -d www.price.easybiny.com

Integrate sendmail Linux EC2 and AWS SES

 1. Configure AWS SES Service as per instructions below:

https://docs.aws.amazon.com/ses/latest/DeveloperGuide/send-email-set-up.html

2. Install sendmail

sudo yum install sendmail

sudo yum install m4

sudo yum install sendmail-cf

3. Follow the below steps from AWS:

https://docs.aws.amazon.com/ses/latest/dg/send-email-sendmail.html

4. Test by running the following command:

echo "Subject: sendmail test" | sendmail -f sender@domain.com  -v destination@domain.com

Linux - See Top memory consumers

1. Simple way to do it is to run following command:

top -o %MEM

2. Output below

[root@ip-x-x-x-x xinetd.d]# top -o %MEM
top - 15:24:13 up  8:02,  1 user,  load average: 0.01, 0.31, 0.25
Tasks: 107 total,   1 running,  66 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.0 us,  0.2 sy,  0.0 ni, 99.3 id,  0.3 wa,  0.0 hi,  0.0 si,  0.2 st
KiB Mem :   472500 total,   227492 free,   185308 used,    59700 buff/cache
KiB Swap:        0 total,        0 free,        0 used.   274136 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 2275 mysql     20   0 1771192  65264      0 S   0.0 13.8   0:09.53 mysqld
 1384 root      20   0   65632  12376  12000 S   0.0  2.6   0:00.66 systemd-journal
 2833 apache    20   0 1923848  10644    152 S   0.0  2.3   0:05.61 httpd
 2572 apache    20   0 2050504   9232    108 S   0.0  2.0   0:05.78 httpd
 2571 apache    20   0 1921608   9196     72 S   0.3  1.9   0:05.60 httpd
 2573 apache    20   0 1917128   8064     88 S   0.0  1.7   0:05.63 httpd
 2258 root      20   0  398704   7360    896 S   0.0  1.6   0:01.19 httpd 

3. As per above, we can see that mysql process is the top memory eater. 

Install Telnet on AWS Linux 2 Server

 1. 

yum -y install telnet

2. 

yum clean all

3. 

rm -rf /var/cache/yum

4. Test:

[root@ip-x-x-x-x xinetd.d]# telnet
telnet>