Shell Programming and Scripting

$ awk '{getline x; getline y; print $0"\t"y"\t"x}' file
INT1:    STR2    STR1
EXT1:    STR2    STR1
INT2:    STR2    STR1

% paste - - - < data1
INT1:	STR1	STR2
EXT1:	STR1	STR2
INT2:	STR1	STR2

awk '{ t=$2 ; $2=$3; $3=t; print }'

echo 'Following assumes 3 lines/row, tab separator:'
awk '{getline o3;getline o2;print $0, o2, o3}' OFS="\t" input
echo
echo 'Following assumes 3 lines/row, field width based on input:'
awk '
BEGIN { s[1] = 1; s[2] = 3; s[3] = 2} # s[input_column#] = output_column#
{       o[int((NR + 2)/3),s[++c]] = $0
        if(length($0) > w[s[c]]) w[s[c]] = length($0)
        if(c == 3) c = 0
}
END {   fmt = sprintf("%%-%ds%%-%ds%%s\n", w[1] + 2, w[2] + 2)
        for(i = 1; i <= NR / 3; i++)
                printf(fmt, o[i,1], o[i,2], o[i,3])
}' input
echo
echo 'Following assumes Column 1 data ends with ":", field width based on input:'
awk '
# Usage: oc = oo(ic)
# NAME oo -- convert input column # to output column #
function oo(ic) {
        return(ic == 2 ? 3 : ic == 3 ? 2 : ic)
}
/:$/ {  r++
        if(c > mc) mc = c
        c = 0
}
{       o[r,oo(++c)] = $0
        if(length($0) > w[oo(c)]) w[oo(c)] = length($0)
}
END {   if(c > mo) mc - c
        for(i = 1; i <= r; i++) {
                for(j = 1; j < mc; j++)
                        printf("%-*s", w[j] + 2, o[i, j])
                printf("%s\n", o[i, mc])
        }
}' input