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命令替代

tag-icon • tag-icon shell-script command-line scripting symlink
命令替代

我不会撒谎。这是为了一个任务。我被困住了，这有点令人沮丧，所以我来到这里作为我的最后手段，所以请帮助我。

因此，我需要编写一个脚本来查找和打印，如果路径是相对路径或绝对路径。我陷入了教授希望我做命令行替代的最后一部分，我不知道该怎么做。这是我到目前为止所拥有的。

if [ "$#" -ne 1 ]; then
    echo 1>&2 "$0: please insert one valid file name;found $# ($*) "
    echo 1>&2 "Usage: $0 [Filename..]"
    exit 2
fi

if [ -z "$1" ] ; then
        echo 1>&2 "$0: file name cannot be empty; found $# ($*) "
        echo 1>&2 "Usage: $0 [filename...] "
        exit 2
fi

if [ ! -L "$1" ] ; then
        echo 1>&2 "$0: The pathname '$1' is not a symlink"
        echo 1>&2 "Usage: '$0' [symlink] "
        exit 2
fi

a=ls "$1" | awk '{ print $NF }'

if [ -z "$a" ] ; then
        echo 1>&2 "$0: Pathname is empty "
        exit 3
fi


    type=$(a)
    case "$b" in
    /* )    type='an Absolute Pathname' ;;
    * )     type='a Relative Pathname in the current directory' ;;  # the "default" match
    echo "pathname'$a' is $type"

    esac

这是他希望我们做的事情的屏幕截图。 在此输入图像描述

如果问题不够清楚，请提出任何问题。谢谢

答案1

剧本还远没有准备好，但你现在已经走在正确的轨道上了。

if [ "$#" -ne 1 ]; then
    echo 1>&2 "$0: please insert one valid file name;found $# ($*) "
    echo 1>&2 "Usage: $0 [Filename..]"
    exit 2
fi

if [ -z "$1" ] ; then
        echo 1>&2 "$0: file name cannot be empty; found $# ($*) "
        echo 1>&2 "Usage: $0 [filename...] "
        exit 2
fi

if [ ! -L "$1" ] ; then
        echo 1>&2 "$0: The pathname '$1' is not a symlink"
        echo 1>&2 "Usage: '$0' [symlink] "
        exit 2
fi

a=$(ls -l "$1" | awk '{ print $NF }')

if [ -z "$a" ] ; then
        echo 1>&2 "$0: A Really Good Error Message."
        exit 3
fi

#    type=$a
    case "$a" in
    /*)    type='an Absolute Pathname' ;;
    *)     type='a Relative Pathname in the current directory' ;;  # the "default" match
    esac
    echo "pathname'$a' is $type"

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