Shell script----for loop

1. Method 1

[CPP]View PlainCopy

1. #!/bin/bash
3. For ((i=1;i<10;i++))
4. Do
5. Echo $i
6. Done

Save As For1.sh

Direct SH for1.sh

Will error:

The Syntax Error:bad for loop variable workaround code is not a mistake for standard bash, because Ubuntu is in the process of using dash instead of the traditional bash in order to speed up the boot.
Workaround

(1) Cancel Dash
sudo dpkg-reconfigure Dash
Select No in the selection.

(2) chmod 777 for1.sh

Run directly./for1.sh

2. Method 2

Using SEQ, there is a SEQ in the dependent system

[CPP]View PlainCopy

1. #!/bin/bash
2. For i in ' seq 10 '
3. Do
4. Echo $i
5. Done

Shell script----for loop