为什么输出看起来不一样?

为什么输出看起来不一样?

执行此脚本后,有时输出如下所示:

1912:!    total e
ergy              = -1090.13343774 Ry
2310:!    total e
ergy              = -1090.20757070 Ry
2709:!    total e
ergy              = -1090.24296462 Ry
3084:!    total e
ergy              = -1090.25563488 Ry
3483:!    total e
ergy              = -1090.27085564 Ry
3870:!    total e
ergy              = -1090.27693129 Ry
4245:!    total e
ergy              = -1090.28213580 Ry
4632:!    total e
ergy              = -1090.29131927 Ry

有时像这样:

1912:!    total energy              = -1090.13343774 Ry
2310:!    total energy              = -1090.20757070 Ry
2709:!    total energy              = -1090.24296462 Ry
3084:!    total energy              = -1090.25563488 Ry
3483:!    total energy              = -1090.27085564 Ry
3870:!    total energy              = -1090.27693129 Ry
4245:!    total energy              = -1090.28213580 Ry

这只是一个错误还是我无意中更改了代码中的某些内容?

代码:

cm=$1
nm=$2
case $cm in
    "out")
        declare -a  en
        ec=$(grep -n "! " hw1_out_si_wire.txt)
        IFS='\n' en=($ec)
        for i in ${en[@]}
        do
            echo "$i"
        done
        ;;
    "in") echo "It's not my problem";;
esac

答案1

IFS='\n'将内部字段分隔符设置为由两个字符组成:(\反斜杠)和字母n。使用IFS=$'\n'它来设置它只包含换行符。

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