2020-2-21 "Linux in respect of such a study" fourth network training courses.
Instructor: Liu Trent
Chapter pipe symbol, redirector and environment variables
3.1 Input and output redirection
redirection symbol: command is supposed to re-enter the contents of the screen output to a file.
3.2 Pipe command symbol
"|" pipe character roles: the original in front of the command to be output to a command screen content referred to secondary treatment.
grep "/ etc / nologin" / etc / passwd | WC the -l
3.3 command line wildcard
3.4 common escape character
\ '', '', ``
3.5 important environmental variables
Chapter 4 vim editor with the command SHELL script
4.1 vim
