请问为什么第一条命令可以得到结果，而后面三条命令都报错了？

bikkuri

请问为什么第一条命令可以得到结果，而后面三条命令都报错了？

[root@jubuntu:~]$ /usr/bin/awk 'BEGIN{x[1]=foo;x[2]=bar;print length(x);}'
2
[root@jubuntu:~]$ awk 'BEGIN{x[1]=foo;x[2]=bar;print length(x);}'
awk: cmd. line:1: fatal: length: received array argument
[root@jubuntu:~]$ awk --posix 'BEGIN{x[1]=foo;x[2]=bar;print length(x);}'
awk: cmd. line:1: fatal: length: received array argument
[root@jubuntu:~]$ /usr/bin/awk --posix 'BEGIN{x[1]=foo;x[2]=bar;print length(x);}'
awk: cmd. line:1: fatal: length: received array argument
[root@jubuntu:~]$ /usr/bin/awk --version
GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2)
Copyright (C) 1989, 1991-2016 Free Software Foundation.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
[root@jubuntu:~]$ awk --version
GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2)
Copyright (C) 1989, 1991-2016 Free Software Foundation.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/.
[root@jubuntu:~]$

baby_神

可能系统问题

1. [root@test-02 ~]# awk --version
   
2. GNU Awk 4.0.2
   
3. Copyright (C) 1989, 1991-2012 Free Software Foundation.
   
4. 
   
5. This program is free software; you can redistribute it and/or modify
   
6. it under the terms of the GNU General Public License as published by
   
7. the Free Software Foundation; either version 3 of the License, or
   
8. (at your option) any later version.
   
9. 
   
10. This program is distributed in the hope that it will be useful,
    
11. but WITHOUT ANY WARRANTY; without even the implied warranty of
    
12. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
13. GNU General Public License for more details.
    
14. 
    
15. You should have received a copy of the GNU General Public License
    
16. along with this program. If not, see http://www.gnu.org/licenses/.
    
17. [root@test-02 ~]# awk 'BEGIN{x[1]=foo;x[2]=bar;print length(x);}'
    
18. 2
    
19. [root@test-02 ~]# awk5 'BEGIN{x[1]=foo;x[2]=bar;print length(x);}'
    
20. 2
    
21. [root@test-02 ~]# awk5 --version
    
22. GNU Awk 5.1.0, API: 3.0
    
23. Copyright (C) 1989, 1991-2020 Free Software Foundation.
    
24. 
    
25. This program is free software; you can redistribute it and/or modify
    
26. it under the terms of the GNU General Public License as published by
    
27. the Free Software Foundation; either version 3 of the License, or
    
28. (at your option) any later version.
    
29. 
    
30. This program is distributed in the hope that it will be useful,
    
31. but WITHOUT ANY WARRANTY; without even the implied warranty of
    
32. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    
33. GNU General Public License for more details.
    
34. 
    
35. You should have received a copy of the GNU General Public License
    
36. along with this program. If not, see http://www.gnu.org/licenses/.

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