Mac系统中下载的文件会带有扩展属性@符号，去不去没什么影响，查看、去除的方法如下

mac@mac ~ % ls -alh
-rw-r--r--@   1 mac   staff   119M Jul 21  2020 go1.14.6.darwin-amd64.tar.gz
mac@mac ~ % xattr -l go1.14.6.darwin-amd64.tar.gz 
com.apple.macl:
00000000  02 00 D6 6D BB 4C A7 FC 49 8E 89 5D 95 3E 38 F3  |...m.L..I..].>8.|
00000010  08 76 02 00 20 51 4B 8C 2A F3 42 1C 8A 4B 3C 6E  |.v.. QK.*.B..K<n|
00000020  C6 EE 95 B4 00 00 00 00 00 00 00 00 00 00 00 00  |................|
00000030  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  |................|
00000040  00 00 00 00 00 00 00 00                          |........|
00000048
com.apple.metadata:kMDItemWhereFroms:
00000000  62 70 6C 69 73 74 30 30 A2 01 02 5F 10 35 68 74  |bplist00..._.5ht|
00000010  74 70 73 3A 2F 2F 64 6C 2E 67 6F 6F 67 6C 65 2E  |tps://dl.google.|
00000020  63 6F 6D 2F 67 6F 2F 67 6F 31 2E 31 34 2E 36 2E  |com/go/go1.14.6.|
00000030  64 61 72 77 69 6E 2D 61 6D 64 36 34 2E 74 61 72  |darwin-amd64.tar|
00000040  2E 67 7A 5F 10 44 68 74 74 70 73 3A 2F 2F 67 6F  |.gz_.Dhttps://go|
00000050  6C 61 6E 67 2E 6F 72 67 2F 64 6F 63 2F 69 6E 73  |lang.org/doc/ins|
00000060  74 61 6C 6C 3F 64 6F 77 6E 6C 6F 61 64 3D 67 6F  |tall?download=go|
00000070  31 2E 31 34 2E 36 2E 64 61 72 77 69 6E 2D 61 6D  |1.14.6.darwin-am|
00000080  64 36 34 2E 74 61 72 2E 67 7A 08 0B 43 00 00 00  |d64.tar.gz..C...|
00000090  00 00 00 01 01 00 00 00 00 00 00 00 03 00 00 00  |................|
000000A0  00 00 00 00 00 00 00 00 00 00 00 00 8A           |.............|
000000ad
com.apple.quarantine: 0081;5f1673c6;Firefox;5576A9F1-9995-4B39-B0D9-1FAB06886251
mac@mac ~ % xattr -c go1.14.6.darwin-amd64.tar.gz
mac@mac ~ % ls -alh
-rw-r--r--   1 root  wheel   2.3M Mar 19 11:23 go1.14.6.darwin-amd64.tar.gz
mac@mac ~ % xattr -c -r *