read读入分隔符

    $ cat 1.txt
    1,a
    2,b
    3,c
    4,d
    $ cat test.sh
    #!/bin/bash
    IFS=","
    while read a b
    do
            echo a=$a b=$b
    done < 1.txt
    $ sh test.sh
    a=1 b=a
    a=2 b=b
    a=3 b=c
    a=4 b=d