Understand the concept, usage and common parameters of echo openssl

• echo ( Wikipedia )

  Echo is the English name of San Mao. In the computer world, it mainly has two meanings:

  • Command to display a line of text
  • NextApp 's web application framework

  Mainly focus on the first one ( Wikipedia ): It echois a command in DOS , OS / 2, Microsoft Windows, Singularity, Unix and Unix-like systems, used to output the string to the terminal. It is usually used in shell scripts and batch processing to output status information to a screen or file .

• echo usage examples

  $ echo This is a test
  This is a test
  $ echo "This is a test." > ./test.txt
  $ cat ./test.txt
  This is a test.
  

  Supports and (activate escape character) parameters in Linux .-n-e

  " Rookie Tutorial "

  " Commands "

• openssl（官网 Github）

  Openssl is used for secure communication, to avoid eavesdropping, and at the same time to confirm the identity of the person at the other end. The basic encryption function is realized, and the SSL and TLS protocols are realized .

  OpenSSL started in 1998 .

  《OpenSSL Cookbook》

  《OpenSSL Command-Line HOWTO》

  " OpenSSL User Guide "

  " Commands "

  " Introduction and Use of openssl "

• echo is shared with openssl

  《How do you pipe “echo” into “openssl”?》