getting value from field dynamically - Shell Programming and Scripting

finalight · #1 05-19-2008

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

agn · #2 05-19-2008

Code:

$ var=1
$ echo $((var+1))
2
$ echo `expr $var + 1`
2
$ echo "$var + 1" | bc 
2

finalight · #3 05-19-2008

it says ranges must be increasing..you mean you can't do a decrement?

namishtiwari · #4 05-19-2008

Code:

a=1
b=5
echo $line | tr -s " " | cut -d " " -f$a-$b

aju_kup · #5 05-19-2008

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
$

finalight · #6 05-19-2008

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

agn · #7 05-19-2008

Code:

echo 'a b c d e f' | cut -d' ' -f 4-

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