linux 相对路径转绝对路径

# 假设当前工作目录是 /home/user/documents
# 相对路径是 ./projects/file.txt

# 获取当前工作目录的绝对路径
current_dir=$(pwd)

# 拼接得到绝对路径
absolute_path="$current_dir/projects/file.txt"

echo "$absolute_path"

# 假设相对路径是 ./projects/file.txt
relative_path="./projects/file.txt"

# 使用 readlink 获取绝对路径
absolute_path=$(readlink -f "$relative_path")

echo "$absolute_path"

# 假设相对路径是 ./projects/file.txt
relative_path="./projects/file.txt"

# 使用 realpath 获取绝对路径
absolute_path=$(realpath "$relative_path")

echo "$absolute_path"

# 使用 realpath 处理符号链接
absolute_path=$(realpath "$relative_path" 2>/dev/null)

if [ -z "$absolute_path" ]; then
    echo "路径不存在或无法解析"
else
    echo "$absolute_path"
fi