getting value from field dynamically


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# 1  
getting value from field dynamically

how i do pass in field number when cutting, I tried to do this:

Quote:
echo $line|cut -d " " -f`$totalWordOfVessel-1`-$totalWordOfVessel
but it says 11-1: not found
# 2  
Code:
$ var=1
$ echo $((var+1))
2
$ echo `expr $var + 1`
2
$ echo "$var + 1" | bc 
2

# 3  
it says ranges must be increasing..you mean you can't do a decrement?
# 4  
Code:
a=1
b=5
echo $line | tr -s " " | cut -d " " -f$a-$b

# 5  
Code:
$ tmp="ABC 123 XYZ 890"
$ t=3
$ echo $tmp | cut -d" "  -f $(echo $t)
XYZ
$ echo $tmp | cut -d" "  -f $(expr $t - 1)
123
$

# 6  
Quote:
Originally Posted by namishtiwari
Code:
a=1
b=5
echo $line | tr -s " " | cut -d " " -f$a-$b

is it possible to do it without using two variables? i want to get last two fields of the line
# 7  
Code:
echo 'a b c d e f' | cut -d' ' -f 4-

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