subtract in sghell script 1

[TheDash]

Hi,

How to subtract in shell script. for example $value -1 ?

i.e In an expression I want $value -1

Thanks

 

[johngiggs]

TheDash,

Use the let command.

Ex.

value=100
let value=$value-10
echo $value

The value of the variable value would be 90.

John

 

[johngiggs]

FYI - That's a ksh command.

John

 

[PHV]

In ksh:
((value-=1))

Hope This Help, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884

 

[Martin999]

try :

echo "$VALUE-1" |bc

works for me ....

Martin

 

[aigles]

Another way (sh, bash, ksh) :
[tt]value=`expr $value - 1`[/tt]

The PHV solution works also with bash

Jean Pierre.