you@you:~/test$ ls
file
you@you:~/test$ path="`pwd`/`ls`"
you@you:~/test$ echo $path
/home/you/test/file

使用指向:

readlink -f file.txt

you@you:~/test$ ls
file
you@you:~/test$ path="`pwd`/`ls`"
you@you:~/test$ echo $path
/home/you/test/file

find $PWD -type f | grep "filename"

or

find $PWD -type f -name "*filename*"

echo $(cd $(dirname "$1") && pwd -P)/$(basename "$1")

这是对@ZeRemz的答案的解释:

这个脚本获取相对路径作为参数"$1" 然后我们得到该路径的dirname部分(你可以将dir或file传递给这个脚本): 然后将“$(dirname“$1”)cd到这个相对目录中 && pwd -P并获取它的绝对路径。-P选项将避免所有符号链接 在此之后，我们将basename附加到绝对路径: 作为最后一步，我们重复它

这很天真，但是我必须使它与POSIX兼容。需要进入文件目录的cd权限。

#!/bin/sh
if [ ${#} = 0 ]; then
  echo "Error: 0 args. need 1" >&2
  exit 1
fi


if [ -d ${1} ]; then


  # Directory


  base=$( cd ${1}; echo ${PWD##*/} )
  dir=$( cd ${1}; echo ${PWD%${base}} )

  if [ ${dir} = / ]; then
    parentPath=${dir}
  else
    parentPath=${dir%/}
  fi

  if [ -z ${base} ] || [ -z ${parentPath} ]; then
    if [ -n ${1} ]; then
      fullPath=$( cd ${1}; echo ${PWD} )
    else
      echo "Error: unsupported scenario 1" >&2
      exit 1
    fi
  fi

elif [ ${1%/*} = ${1} ]; then

  if [ -f ./${1} ]; then


    # File in current directory

    base=$( echo ${1##*/} )
    parentPath=$( echo ${PWD} )

  else
    echo "Error: unsupported scenario 2" >&2
    exit 1
  fi
elif [ -f ${1} ] && [ -d ${1%/*} ]; then


  # File in directory

  base=$( echo ${1##*/} )
  parentPath=$( cd ${1%/*}; echo ${PWD} )

else
  echo "Error: not file or directory" >&2
  exit 1
fi

if [ ${parentPath} = / ]; then
  fullPath=${fullPath:-${parentPath}${base}}
fi

fullPath=${fullPath:-${parentPath}/${base}}

if [ ! -e ${fullPath} ]; then
  echo "Error: does not exist" >&2
  exit 1
fi

echo ${fullPath}