cd 进入所有目录，对该目录下的文件执行命令，并返回上一个当前目录

Question

我正在尝试编写一个脚本，该脚本将在具有许多单级子目录的给定目录中运行。该脚本将 cd 进入每个子目录，对目录中的文件执行命令，然后 cd out 继续到下一个目录。做这个的最好方式是什么？

Answer 1

for d in ./*/ ; do (cd "$d" && somecommand); done

Answer 2

最好的方法是根本不使用cd：

find some/dir -type f -execdir somecommand {} \;

execdir就像exec，但工作目录不同：

-execdir command {} [;|+]
  Like   -exec,   but  the  specified  command  is  run  from  the
  subdirectory containing the matched file, which is not  normally
  the  directory  in  which  you  started  find.  This a much more
  secure  method  for  invoking  commands,  as  it   avoids   race
  conditions  during resolution of the paths to the matched files.

它不是 POSIX。

Answer 3

for D in ./*; do
    if [ -d "$D" ]; then
        cd "$D"
        run_something
        cd ..
    fi
done