Linux first-recognize shell

1. View the native supported shell types, cat/etc/shells. /bin/bash is the default shell for Linux

2.bash Shell function Command memory function history (file address ~/.bash_history) tab command complement function alias command aliases set function program script (shell script) wildcard character

3.type View built-in command type BUILTIN bash built-in command alias command aliases set command file External command

4. View echo $variable cancel variable unset variable

Linux first-recognize shell