Shulou(Shulou.com)06/02 Report--

# nano filename.sh

The creation file ends with .sh. Represents a script file

#! / bin/bash

Means to use bash for interpretation

If judgment condition; then

Echo "yes."

Else

Echo "no."

Fi

Step-by-step implementation of bash-x [easy to check in the end the ability is wrong]

Bash-n test for syntax errors

Multi-branch if statement

If judgment condition; then

Execution

Elif judgment condition; then

Execution

Elif judgment condition; then

Execution

Else

Execution

Fi

If if then then, then elif is not; if else other, if. Otherwise, the fi ends if it exists, otherwise & & | | otherwise if it does not exist! & & | if it doesn't exist and otherwise! & | |! It means to take the reverse & > / dev/null trash can {put here not shown} position variable; $1 / 1 / 2 / 3. Represents a special variable; $? $# $* $@

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