There are several things we need to do to make things easier when change router You will run into following issues: Next time, if I want to change router, most of smart device would just work but I need to: Notes Limitation on the Xfinity Gateway Pending issue

Line number Sort slow query log Find lines start with specific characters Exclude characters

It always very handy to know a little bit bash to do file operation. E.G. generate SQL by csv. Convert csv to a SQL: Input Script Output Notes: Generate UUID and convert big case to small case

Behavior Command Comment go to the beginning of the line ctrl+a go to the end of the line ctrl+e Save a output of a command to a env variable principle_arn=$(aws –profile perAdmin sts get-caller-identity –query Arn –output text) use a env variable ${principle_arn} replace character sed -e “s|PRINCIPAL_ARN|${principle_arn}|g” \assume-role-policy-template.json > assume-role-policy.json The delimiter of choice is a forward slash (/), which is the most commonly used delimiter. However, sed can use any character as a delimiter. In fact, it will automatically use the character following the s as a delimiter-e means you can use the followed scripts multiple times.https://unix.stackexchange.com/questions/33157/what-is-the-purpose-of-e-in-sed-command

This example is for Ubuntu. Run sudo apachectl -S to check which conf file you are using. The result is something like: Then update the file /etc/apache2/sites-enabled/000-default.conf. Change the default file in that file. You need to change another file /etc/apache2/ports.conf. to update it to the right port. Restart apache sudo service apache2 restart Then check the status: sudo apachectl -S Done.

If you run out of space in one disk and you want to add a new one but you would like to move the existing data to the new disk, what would you do? Step 1: Identify the big folder Identify the folder which has the biggest files and you want to move. Here is the command you may want to run: -S Do not include the size of subdirectories. This is very useful and it would exclude the parent folder if the child folder on the list already. This would save you a lot of trouble to de-dup. the two -h should use together. We list the human readable…