cloud engineer
The script command records all your keystrokes and output into a file called typescript.
You can start recording by simply typing script.
script Script started, file is typescript df -h ls -l exit |
script Script started, file is typescript df -h ls -l exit
Typing exit stops the recording. Just cat typescript to see your recording.
cat typescript |
cat typescript
Here are steps I took to upgrade from PHP 7.0 to 7.4 on Ubuntu 18.04 LTS.
Login as root, otherwise use sudo for all commands.
# use 3rd party ppa repo add-apt-repository ppa:ondrej/php apt -y update apt -y upgrade # install php-core apt install php7.4 php7.4-common php7.4-cli # add all the php extenstions your app needs apt install php7.4-curl php7.4-json php7.4-gd php7.4-mbstring apt install php7.4-intl php7.4-bcmath php7.4-bz2 php7.4-xml apt install php7.4-readline php7.4-zip php7.4-mysql # I'm using apache prefork MPM, so install it apt install libapache2-mod-php7.4 a2enmod php7.4 # check version. Success! php -v # for good measure, reboot apache systemctl restart apache2.service # Finally, purge the old PHP versions apt purge php7.0 libapache2-mod-php7.0 |
# use 3rd party ppa repo add-apt-repository ppa:ondrej/php apt -y update apt -y upgrade # install php-core apt install php7.4 php7.4-common php7.4-cli # add all the php extenstions your app needs apt install php7.4-curl php7.4-json php7.4-gd php7.4-mbstring apt install php7.4-intl php7.4-bcmath php7.4-bz2 php7.4-xml apt install php7.4-readline php7.4-zip php7.4-mysql # I'm using apache prefork MPM, so install it apt install libapache2-mod-php7.4 a2enmod php7.4 # check version. Success! php -v # for good measure, reboot apache systemctl restart apache2.service # Finally, purge the old PHP versions apt purge php7.0 libapache2-mod-php7.0
Finally, run update on more time to get all the latest updates.
apt -y update apt -y upgrade apt -y autoremove apt-get --with-new-pkgs upgrade |
apt -y update apt -y upgrade apt -y autoremove apt-get --with-new-pkgs upgrade
How to install AWS CLI version 2.
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" unzip awscliv2.zip sudo ./aws/install |
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip" unzip awscliv2.zip sudo ./aws/install
Here’s how to read Bash variables from another file.
Contents of config.sh
#!/bin/bash var1='thisisvariableone' var2='thisisvariabletwo' |
#!/bin/bash var1='thisisvariableone' var2='thisisvariabletwo'
Call config.sh from another script.
#!/bin/bash source config.sh echo var1 echo var2 |
#!/bin/bash source config.sh echo var1 echo var2
This is extremely helpful if you have multiple scripts using a common variable. You just to update one file instead of multiple files. All the other scripts will read and pick up the same variables from a config file. You can use this to setup your global variables.
My internet has been flaky lately. I wrote a script that logs my internet connection.
I’m running it in cron every minute.
#!/bin/bash log='/home/ulysses/Code/spectrum.log' if nc -zw1 google.com 443; then echo 'Spectrum is up' $(date) >> $log else echo 'Spectrum is down' $(date) >> $log fi |
#!/bin/bash log='/home/ulysses/Code/spectrum.log' if nc -zw1 google.com 443; then echo 'Spectrum is up' $(date) >> $log else echo 'Spectrum is down' $(date) >> $log fi
To view, just cat the log.
cat spectrum.log Spectrum is up Fri Jun 26 15:14:01 EDT 2020 Spectrum is up Fri Jun 26 15:15:01 EDT 2020 Spectrum is up Fri Jun 26 15:16:01 EDT 2020 Spectrum is up Fri Jun 26 15:17:01 EDT 2020 Spectrum is up Fri Jun 26 15:18:01 EDT 2020 |
cat spectrum.log Spectrum is up Fri Jun 26 15:14:01 EDT 2020 Spectrum is up Fri Jun 26 15:15:01 EDT 2020 Spectrum is up Fri Jun 26 15:16:01 EDT 2020 Spectrum is up Fri Jun 26 15:17:01 EDT 2020 Spectrum is up Fri Jun 26 15:18:01 EDT 2020
So, I now have a record when it was up or down.