For example, if the command line were myrm, -r -f -P file1 file2 file3, shift 3 would remove $0, $1, and $2 or -r, -f, and -P, respectively.

例如，如果命令行为myrm, -r -f -Pfile1file2file3，则 shift3将分别删除 $0、$1和 $2，或 -r、-f 和 -P。