linux – 如何在shell中创建一个包含多列的循环？

ifile.txt
1      32.2    21.4
4      33.2    43.5
5      21.3    45.6
12     22.3    32.5
32     21.5    56.3
43     33.4    23.4
44     23.3    22.3
55     22.5    32.4

我想在第2列和第3列上做一个循环,这样就可以了

for x=32.2 and y=21.4; do execute a fortran program
for x=33.2 and y=43.5; do execute the same program
and so on

虽然我的以下脚本正在运行,但我需要它以有效的方式.

s1=1   #serial number
s2=$(wc -l < ifile.txt)   #total number to be loop
while [ $s1 -le $s2 ]
do
x=$(awk 'NR=='$s1' {print $2}' ifile.txt)
y=$(awk 'NR=='$s1' {print $3}' ifile.txt)
cat << EOF > myprog.f
...
take value of x and y
...
EOF
ifort myprog.f
./a.out
(( s1++ ))
done

请注意：myprog.f是在cat程序中编写的.例如,

cat << EOF > myprog.f
....
....
take value of x and y
....
....
EOF

while read -r _ x y; do
    echo "x is $x, y is $y"
    # your Fortran code execution
done < ifile.txt
x is 32.2, y is 21.4
x is 33.2, y is 43.5
x is 21.3, y is 45.6
x is 22.3, y is 32.5
x is 21.5, y is 56.3
x is 33.4, y is 23.4
x is 23.3, y is 22.3
x is 22.5, y is 32.4