get digits

[ogniemi]

how to get only digits from a variable?

for example, variable can be set to one of the following:

42d43%
9845dhg984$sfd9%
sd@#948**##376

I need output:

4243
98459849
948376

thank you in advance.

 

[feherke]

Hi

var=`echo $var | tr -dc '[:digit:]'`

[gray]# or[/gray]

var=`echo $var | sed 's/[^[:digit:]]//g'`

[gray]# or[/gray]

var=`echo $var | awk '{gsub(/[^[:digit:]]/,"")}1'`

Feherke.

http://rootshell.be/~feherke/

 

[p5wizard]

As this is an awk forum...

echo abc12 def34% 8dbc9|awk '{
 for (i=1;i<=NF;i++)
 {
  var="";
  for (j=1;j<=length($i);j++)
  {
   if (((k=substr($i,j,1)) >= "0") && (k <= "9"))
    var=var k
  }
  printf "%s ", var
 }
 printf "\n"
}'

HTH,

p5wizard

 

[feherke]

Hi

Yep, was too late when I observed that I wrote in the [tt]awk[/tt] forum.

But I still prefer the [tt]gsub()[/tt] way.

gsub(/[^[:digit:]]/,"",[green][i]var[/i][/green])

Feherke.

http://rootshell.be/~feherke/