Final answer:
To view the first 20 lines of /proc/cpuinfo, you would use the command head -n 20 /proc/cpuinfo, which provides an easy way to see key CPU information.
Step-by-step explanation:
The command to look at the first 20 lines of /proc/cpuinfo is achieved by combining the head command with a pipe from the cat command. This can be done using the following syntax in a Linux terminal:
head -n 20 /proc/cpuinfo
/proc/cpuinfo contains information about the CPU, and the head command with the -n option allows you to display the first N number of lines from a given file or stream. In this case, replacing N with 20 will display the first 20 lines of the CPU information. It is a simple yet effective method for quickly examining key CPU characteristics from the command line without needing to open the whole file.