1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
touch linuxprobe
ls -l linuxprobe
-rw-r--r--. 1 root root 0 Aug 5 05:35 linuxprobe
ls -l xxxxxx
ls: cannot access xxxxxx: No such file or directory
man bash > readme.txt
cat readme.txt
BASH(1) General Commands Manual BASH(1)
NAME
bash - GNU Bourne-Again SHell
echo "Welcome to LinuxProbe.Com" > readme.txt
#追加写入
echo "Quality linux learning materials" >> readme.txt
cat readme.txt
Welcome to LinuxProbe.Com
Quality linux learning materials
ls -l linuxprobe
-rw-r--r--. 1 root root 0 Mar 1 13:30 linuxprobe
ls -l linuxprobe > /root/stderr.txt
#错误输出重定向
ls -l linuxprobe 2> /root/stderr.txt
-rw-r--r--. 1 root root 0 Mar 1 13:30 linuxprobe
#错误输出写入文件
ls -l xxxxxx
cannot access xxxxxx: No such file or directory
ls -l xxxxxx > /root/stderr.txt
cannot access xxxxxx: No such file or directory
ls -l xxxxxx 2> /root/stderr.txt
cat /root/stderr.txt
ls: cannot access xxxxxx: No such file or directory
#统计行数，等同cat readme.txt | wc -l
wc -l < readme.txt
2