理解Linux中bash、terminal（编码）、export、echo

• bash

  GNU Bash

  Wikipedia Bash

  Bash Reference Manual

  From GUN, Bash is the GNU Project’s shell.

  Bash is the Bourne Again Shell.

  Bash is an sh-compatible shell that incorporates useful features from the Koren shell(ksh) and C shell(csh).

  Most sh scripts can be run by Bash without modification.

• echo [-neE] [arg ...]

  echo is one of the