Searching in big log files

You have big (gigabytes) log files, and want to search for text that occured recently (close to the end of file).

Open file in less:

$ less file.log

Go to the end of file: press SHIFT+G
Press CTRL+C if you don't need lines numbers
Enter:

?<search term>

to search backwards for the term. Press "?" to search for next occurence.