Shell Syntax One

See the Shell function notation for reference

/etc/init.d/functions printing information can be called, action function

Local variable use plus local definition

Global variables don't add anything

Need to execute the life using the anti-quote '

Strings typically use double quotes ""

Use single quotation marks as output

Scripts can use SH or bash to execute function script loading without giving execute permission

Function can be added when using. or source definition functions

The best way to echo debug scripts

Set-x in script to enable debug mode

Set +x in script to turn off debug mode

Bashdb Dedicated script debugging tool

md5sum Password Generation tool OpenSSL rand 20 password generation tool

partproble Flush disk partition fdisk disk partition tool, disk greater than 2T unavailable parted disk larger than 2T available

PARTED/DEV/SDB mklabel GPT change disk partition table

MKFS.EXT3/DEV/SDB1 formatting

Hang on some things generally do not put in/etc/fstab, should put in etc/rc.local virtual machine can add hard disk,

7, array definition: The array is represented by parentheses, the elements inside are separated by a space

arry= (var1 var2 var3) or arry[0]=var1

Arry[1]=var2 ARRY[2]=VAR3

Read Array contents:

${arry[*]} or ${arry[@]}

Represents all elements in the call array var1 var2 VAR3 ${arry[1]}

Get Var2 ${arry[0]}

Get var1 .... ${arry[n-1]}

Gets the nth element in the array

8, define a type of variable declare

-I: Treat variables as integers

-R: Read-only variable

-X: The variable is passed to the environment variable by export

-A: Treat variables as arrays

Branch statement if condition; then

DoSomething ... fi

If condition Then

DoSomething ... else

DoSomething ... fi

If condition Then

DoSomething ... elif conditions then

DoSomething ... fi

Case $yn in

1);;

2);;

*) ;;

Esac

Looping statements

While condition do

DoSomething ... done

Until conditions do

DoSomething ...

Done

For condition in Do

DoSomething ...

Done

For ((EXPR1;EXPR2;EXPR3))

Do

Command ... done

Shell Syntax One