In the company, most of the people are remote Connection control server, the following to solve a novice use Xshell when the problem occurs
Some people use Xshell telnet to the Linux server, and then under the VI Editor to edit things appear by keypad number keys appear in the case of English letters, the solution is as follows:
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The solution of using the Xshell to Telnet to Linux in the Vim editor to edit something by the number key appearing in the English alphabet