Put char with sed

put char on position X with sed
 
put space on position 5
echo 1234567 | sed 's/./& /5'

put . on position 5
echo 1234567 | sed 's/./&./5'

Add nginx repository Ubuntu

 Add nginx repository Ubuntu # 1. Download the NGINX signing key curl https://nginx.org/keys/nginx_signing.key | gpg --dearmor | sudo tee /u...

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