[问题求助][RedHat] 这个命令怎么不行啊? [复制链接]

如果我用c.at /dev/null > t1,就可以清空t1这个.文件,           鲜花
如果我有两.个文件t1和t2,为什么我用cat /d.ev/null > *就不行了?虚拟主机
*不是可以代表所有文件的么? http://upload.bbs.csuboy.com/Mon_1004/126_6899_c7a6b4605790573.gif[/img]

[root@rhel5. tmp2]# ll(广告)
total 8
-rw-r--r-- 1 .root root  7 .Nov 21 20:30 t1             汽车
-rw-r--r-- 1 roo..t root 22 Nov 21 20:29 t2.
[r.oot@rhel5 tmp2]# cat *.
Peifei
Peifei is a g.ood man!           女人
[root@rhel5 tmp2]# cat ./dev/null .> *    美容
-bash: .*: ambiguous redi.rect.

The  word  following the redirection operator in the following descrip-
       tions, unless otherwise noted, is subjected to brace  expansion,  tilde
       expansion, parameter expansion, command substitution, arithmetic expan-
       sion, quote removal, pathname expansion, and  word  splitting.   If  it
       expands to more than one word, bash reports an error.

cat /dev/null > filename,用*号不行吧

QUOTE:原帖由 tianlijian 于 2008-11-22 12:26 发表
The  word  following the redirection operator in the following descrip-
       tions, unless otherwise noted, is subjected to brace  expansion,  tilde
       expansion, parameter expansion, com ...

正解

路过学习一下。

既然这样可以写个脚本来清空超过两个文件。