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Check SSL Certificate expiration from command line
This quick tip shows how you can get the expiration date of a certificate from the command line.
Repeatable command history with hidden passwords
When running commands that require a password, it's a bad idea to type the password in the shell. Your password will be stored in your history file. You want to avoid doing this:
Preview changes made with sed
When making changes to a file with sed, you might want to see what would be changed before you make the change.