Shell basic syntax --- if statement

The if statement

• format

# A single limb
 IF [condition determination]; the then 
    perform an action 
Fi 

IF [condition determination]; the then 
    performing an action 
else 
    performing an action 
Fi 

# multibranched 
IF [condition determination]; the then 
    perform an action 
elif [conditional]; the then 
    perform an action 
elif [Condition Analyzing]; the then 
    perform an action 
fi

 

• example

. 1 ! # / Bin / the bash
 2  Digital # determines whether the input is greater than 10
 . 3  echo  ' Please enter a number: ' 
. 4  Read Number
 . 5  
. 6  IF [$ Number -eq 10 ];
 . 7      the then 
. 8      echo  ' equal to 10 ' 
. 9  elif [ Number -LT-$ 10 ]
 10      the then 
. 11      echo  " less than 10 " 
12 is  elif [$ -gt Number 10 ]
 13 is      the then 
14      echo  ' greater than 10 ' 
15 be