Display date and time: Date
- Date +%y/%m/%d
- Date +%h:%m
Show Calendar: Cal
- Show a full year (Cal 2009)
- Displays a one month (Cal [[month]] year) for a given period, such as Cal 10 2009
Easy to use calculator: BC Qiut is leaving this calculator
- BC only outputs integers by default, and if you output all decimals, you must execute Scale=number,number, which is the number of digits behind the decimal point
Important hotkeys
- [Tab] is followed by a string of bright first commands, which is the command complement
- [Tab] After the second bright of a string of commands, is the file completion
- [Ctrl]+c interrupts the current program
- [ctrl]+d equivalent to input exit
Man is a shorthand for manual, operating instructions
- After entering the man command, you can press the SPACEBAR to page down and press the Q key to leave the man environment.
common numbers and meanings
- 1 commands or executables that users can manipulate in a shell environment
- 2 functions and tools that can be called by the system kernel
- 3 some commonly used functions or libraries, most of which are C libraries
- 4 description of the device files, usually files in/dev
- 5 configuration files or the format of some files
- 6 games
- 7 Formula and agreement
- 8 Administrative commands available to system administrators
- 9 Documents related to kernel
Man page Common keys
- SPACEBAR to turn down one page
- Page DOWN pages
- Page UP pages up
- Home go to the first page
- End go to the last page
- /string query string string down
- String up query string
- N,n
- Q End of this man page
Linux Base command operations
