how to check if a path is actual or symbolic link

问题

I am writing my own shell program. I am currently implementing the cd command using chdir. I want to implement the cd with the below options :

• -P Do not follow symbolic links
• -L Follow symbolic links (default)

When a given path is entered on the shell, how to figure out if the path is a symbolic link or an absolute path progamatically?

Thanks

回答1:

Check out the lstat() function , you need to use S_ISLNK on the st_mode field.

回答2:

if [ -L /path/to/file ]; then
  echo "is a symlink!"
else
  echo "not a symlink! maybe a directory or regular file, or does not exist"
end

来源：https://stackoverflow.com/questions/3032897/how-to-check-if-a-path-is-actual-or-symbolic-link