Shell Programming and Scripting

Depending on what you want:

Code:

awk -F'. '{for ( n = NF - 1; n >= 1; --n ) printf "%s.", $n; print $NF}'

Or:

Code:

awk -F'[.,] '{for ( n = NF - 1; n >= 1; --n ) printf "%s.", $n; print $NF}'

Actually, there was one missing. It should have been -F'[,.]'.

awk -F[.,] '{for ( n = NF - 1; n >= 1; --n ) printf "%s,", $n; print $NF}'

Code:

 awk -F, 'BEGIN { req = 5 }
    {
       nn=split( $1, a,".")
       for ( n=nn; n >= 1; --n ) printf "%s,", a[n]
       while ( nn++ < req ) printf ","
       print $NF
    }'