Darwin
nl 對達爾文的影響最小
最不驚訝的越界：
bash-5.0$ (for i in {1..1000010}; do echo $i; done) | nl | tail -24 999987 999987 999988 999988 999989 999989 999990 999990 999991 999991 999992 999992 999993 999993 999994 999994 999995 999995 999996 999996 999997 999997 999998 999998 999999 999999 000000 1000000 000001 1000001 000002 1000002 000003 1000003 000004 1000004 000005 1000005 000006 1000006 000007 1000007 000008 1000008 000009 1000009 000010 1000010 bash-5.0$ uname -a Darwin llc.local 19.4.0 Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 20 20; root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64 bash-5.0$ sw_vers ProductName: Mac OS X ProductVersion: 10.15.4 [...] bash-5.0$ _與預期比較：
admin@ip-w-x-y-z:~$ (for i in {1..1000010}; do echo $i; done) | nl | tail -24 999987 999987 999988 999988 999989 999989 999990 999990 999991 999991 999992 999992 999993 999993 999994 999994 999995 999995 999996 999996 999997 999997 999998 999998 999999 999999 1000000 1000000 1000001 1000001 1000002 1000002 1000003 1000003 1000004 1000004 1000005 1000005 1000006 1000006 1000007 1000007 1000008 1000008 1000009 1000009 1000010 1000010 admin@ip-w-x-y-z:~$ uname -a Linux ip-w-x-y-z 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u4 (2019-07-19) x86_64 GNU/Linux admin@ip-w-x-y-z:~$ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 9.9 (stretch) Release: 9.9 Codename: stretch admin@ip-w-x-y-z:~$ _我很好奇您對此有何想法以及如何克服。謝謝。
添加的數字的預設寬度
nl是 6。這在nl手冊中進行了記錄，並由 POSIX 標準指定。
nl如果數字長於寬度，macOS會截斷數字（並且手冊記錄了這一點），而 GNUnl不會（但沒有記錄這一點）。標准文本似乎都不允許這兩種行為。要對需要超過 6 位數字的行進行編號，請使用以下
-w選項指定更大的寬度nl：$ (for i in {1..1000010}; do echo $i; done) | nl -w 7 | tail -24 999987 999987 999988 999988 999989 999989 999990 999990 999991 999991 999992 999992 999993 999993 999994 999994 999995 999995 999996 999996 999997 999997 999998 999998 999999 999999 1000000 1000000 1000001 1000001 1000002 1000002 1000003 1000003 1000004 1000004 1000005 1000005 1000006 1000006 1000007 1000007 1000008 1000008 1000009 1000009 1000010 1000010