Linux系统中获取路径的文件名的方法

时间:2016-09-26 18:51:32 

这篇文章主要介绍了Linux系统中获取路径的文件名的方法,文中总结出了两条,需要的朋友可以参考下

代码如下:

[root@dabu.info ]#basename /root/aaa/bbb/dabu.txt

显示:

代码如下:

dabu.txt #获取路径的文件名

shell脚本中如何获得脚本文件所在路径?

方法一:

代码如下:

[root@dabu.info ]#DIR=$(cd "$(dirname "$0")"; pwd)

[root@dabu.info ]#echo $DIR

但是像这种dirname "$0"这种写法,在遇到source命令时会得到错误的结果。

方法二:

代码如下:

[root@dabu.info ]#echo "$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

上面一行命令可以获得脚本的绝对轮径,无论你在何处调用这个脚本。

但是如果含有软链接,就无法使用了。所以,我们为了能正确解析指向脚本的软链接,可以使用下面的多行命令:

代码如下:

SOURCE="${BASH_SOURCE[0]}"

while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink

DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

SOURCE="$(readlink "$SOURCE")"

[[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located

done

DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

也可与source,bash -c命令使用

但是,如果你在脚本中使用先cd切换到其他目录,在运行时上面的命令片段时,则上面的命令不能等到正确的结果。可以参考关于$CDPATH 陷阱的文章。想理解它如何其作用的,可以运行下面的代码:

代码如下:

#!/bin/bash

SOURCE="${BASH_SOURCE[0]}"

while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink

TARGET="$(readlink "$SOURCE")"

if [[ $SOURCE == /* ]]; then

echo "SOURCE "$SOURCE" is an absolute symlink to "$TARGET""

SOURCE="$TARGET"

else

DIR="$( dirname "$SOURCE" )"

echo "SOURCE "$SOURCE" is a relative symlink to "$TARGET" (relative to "$DIR")"

SOURCE="$DIR/$TARGET" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located

fi

done

echo "SOURCE is "$SOURCE""

RDIR="$( dirname "$SOURCE" )"

DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"

if [ "$DIR" != "$RDIR" ]; then

echo "DIR "$RDIR" resolves to "$DIR""

fi

echo "DIR is "$DIR""

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