bash scripting basics

, and the shell interprets the execution.• Batch processing (Batch): The user writes a shell script in advance, with many commands that allow the shell to execute the commands one at a time without having to hit the command one by one. Shell scripts and programming languages are similar, there are variables and process control statements, but shell scripts are interpreted to execute, do not need to compile, the shell program from the script to read and execute the command line, the equivalent o

Fast cursor Movement----------------------------------------CTRL + a jumps to the beginning of the commandCtrl+e jump to the end of the command line-----------------------------------------Delete the contents of a command-----------------------------------------Ctrl+w Delete the previous word of the cursorCtrl+u Delete the character from the beginning of the cursorCtrl+k Delete the character of the cursor to the end of the line-----------------------------------------Ctrl+l Clear ScreenCTRL + C

Caimont The idea of writing an article, after receiving the strong support of Mr. Hongbin of Chinabyte Network College, you will be able to see this article. The author earnestly hopes that through this article for the vast number of WEB developers and enthusiasts to provide convenience, to enable everyone to participate in the study and exchange of ASP, in order to cover the needs of readers at different levels the author decided to start from the most basic

it into a string$# number of parameters after output script[email protected] references all parameters after the script, but one reference$? Output previous command execution status return codeNumeric operationsLet VAR=ARG1+-*/%ARG2var=[$a + $b]var=$ (($a + $b))var=$ (expr ar1 ar2 ...)Logical operations | | Or! Non -Pstree Show Process TreeExport displays all of the current environment variablesUnset the variables that were set before the undoReadOnly setting read-only variablesDeclare-R Set re