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Bash assign string to variable

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# 8  
Old 02-02-2011
Thanks ,I changed the code but now var price doesnt have return result
Any idea why
Code:
 
#!/bin/bash
echo -n "Please provide a product id: "
read id
line=`grep "$id" inventory`
if(($(echo ${#line})==0))
then
{
echo No mach
}
else
{
qty=`echo $line | cut -c6-10`
price=`echo $line | cut -c11-15`    
echo price $price
echo quantity $qty
}
fi

# 9  
Old 02-02-2011
don't use braces with your if/else. ( braces {} have different meaning in shell ). you can use -n or -z in your if/else to check for string size
# 10  
Old 02-02-2011
Thanks ,could you show me how to use it with code
# 11  
Old 02-03-2011
Quote:
Originally Posted by lio123
Thanks ,I changed the code but now var price doesnt have return result
Any idea why
Code:
 
#!/bin/bash
echo -n "Please provide a product id: "
read id
line=`grep "$id" inventory`
if(($(echo ${#line})==0))
then
{
echo No mach
}
else
{
qty=`echo $line | cut -c6-10`
price=`echo $line | cut -c11-15`    
echo price $price
echo quantity $qty
}
fi


The braces are unnecessary, but don't affect anything.

In bash (and ksh93), you can use the substring expansion instead of the external command, cut:
Code:
if [ -z "$line" ]
then
  echo No match
else
  qty=${line:5:5}
  price=${line:6:5}
  echo price $price
  echo quantity $qty
fi

# 12  
Old 02-03-2011
Quote:
Originally Posted by ghostdog74
as well as bash. it's actually all right to use
OK, but it it should not be regarded as just another way to assign something to a variable:
Code:
$ let x=a
$ echo $x
0
$ x=a
$ echo $x
a

Last edited by Scrutinizer; 02-03-2011 at 02:41 AM..
# 13  
Old 02-03-2011
Quote:
Originally Posted by Scrutinizer
OK, but it it should not be regarded as just another way to assign something to a variable:
Code:
$ let x=a
$ echo $x
0
$ x=a
$ echo $x
a

sure, because after all let is used for arithmetic, since its what OP is doing anyway storing prices, quantities etc. It is still all right to use it in his case.
# 14  
Old 02-03-2011
Quote:
Originally Posted by ghostdog74
sure, because after all let is used for arithmetic, since its what OP is doing anyway storing prices, quantities etc. It is still all right to use it in his case.
There is no good reason for using let. It is not standard, and it adds nothing.
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