linux输出重定向

输出重定向

1. 标准输入输出

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2. 输出重定向

示例：

[cds@iz2zedek646lh3ouoyvdsmz ~]$ ll
total 8
-rw-rw-r-- 1 cds cds 129 Aug  9 20:14 a.txt
-rw-rw-r-- 1 cds cds  96 Aug  9 21:06 b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ ll > b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ cat b.txt 
total 4
-rw-rw-r-- 1 cds cds 129 Aug  9 20:14 a.txt
-rw-rw-r-- 1 cds cds   0 Aug  9 21:06 b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ ls
a.txt  b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ ls >> b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ cat b.txt 
total 4
-rw-rw-r-- 1 cds cds 129 Aug  9 20:14 a.txt
-rw-rw-r-- 1 cds cds   0 Aug  9 21:06 b.txt
a.txt
b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ lsdf 2>> b.txt
[cds@iz2zedek646lh3ouoyvdsmz ~]$ cat b.txt 
total 4
-rw-rw-r-- 1 cds cds 129 Aug  9 20:14 a.txt
-rw-rw-r-- 1 cds cds   0 Aug  9 21:06 b.txt
a.txt
b.txt
bash: lsdf: command not found...

• 上面的内容是为了引出下面这些内容

• 丢到垃圾桶
• ls &>/dev/null

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3.输入重定向

[cds@iz2zedek646lh3ouoyvdsmz ~]$ wc < a.txt
  9   6 129
[cds@iz2zedek646lh3ouoyvdsmz ~]$ wc << end
> adfa
> dfdskjf
> dfds
> end
 3  3 18