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Linux系统中获取路径的文件名的方法

  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:

  [[email protected] ]#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:

  [[email protected] ]#DIR=$(cd "$(dirname "$0")"; pwd)

  [[email protected] ]#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:

  [[email protected] ]#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

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  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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