How to extract field from variable more efective

pp56825 · #1 (**permalink**) 01-19-2008

Hi,
I know that simple way to do this is var=`echo $line | awk '{print $5}'`
But maybe there is shorter way to do this ?

Also maybe there is some way to assign all fileds from line separated by lets say ":" to some variables
instead of
var1=`echo $line | awk '{print $1}'`
var2=`echo $line | awk '{print $2}'`
.....

Peter

ghostdog74 · #2 (**permalink**) 01-19-2008

Code:

set -- $line
echo $1 $2 ...

pp56825 · #3 (**permalink**) 01-19-2008

Quote:

Originally Posted by ghostdog74

Code:

set -- $line
echo $1 $2 ...

What if the fileds in line are separated by : or ~ ?

found that i can export IFS=":".

Ghostdog thanks for this set trick.

JyotiC · #4 (**permalink**) 01-19-2008

You can also use "cut".

pp56825 · #5 (**permalink**) 01-19-2008

Maybe somebody know some page or forum with shell scripting optimalization ? or some tips and triks

pp56825 · #6 (**permalink**) 01-19-2008

this is very usefull:

file:
sda:asd:asd
asd:awq:qwe
das:wer:tyu
asd:wer:123
asd:234:456

export IFS=":"
while read a b c;do echo $a $b $c;done < test

radoulov · #7 (**permalink**) 01-19-2008

Quote:

Originally Posted by pp56825

What if the fileds in line are separated by : or ~ ?

found that i can export IFS=":".
[...]

With ksh93 and bash you could use something like this:

Code:

$ str="one:two-three" oIFS=$IFS IFS=':-' a=($str) IFS=$oIFS
$ echo ${a[0]}
one
$ echo ${a[1]}
two
$ echo ${a[2]}
three

With zsh:

Code:

% str=one:two:three
% a=(${(s.:.)str})   
% echo $a[1]
one
% echo $a[2]
two
% str=one-two-three
% a=(${(s.-.)str})   
% echo $a[3]         
three

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