Linux基本操作实验（5）

[root@windriver-machine shtest]# echo "\007you home is $HOME,you are connected on `tty`"
\007you home is /root,you are connected on /dev/pts/0
[root@windriver-machine shtest]# echo -e "\007you home is $HOME,you are connected on `tty`"
you home is /root,you are connected on /dev/pts/0
[root@windriver-machine shtest]# echo Hello world
Hello world
[root@windriver-machine shtest]# echo "Hello world"
Hello world
[root@windriver-machine shtest]# w
22:36:57 up 87 days, 23:16, 1 user, load average: 0.00, 0.00, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
windrive pts/0 :2.0 Sat19 1.00s 0.28s 6.56s gnome-terminal
[root@windriver-machine shtest]# echo -e "Here is a tab\there are two tabs\t\tOK"
Here is a tab here are two tabs OK
[root@windriver-machine shtest]# echo "\"/dev/rmt0\""
"/dev/rmt0"
[root@windriver-machine shtest]# echo "The log files have all been done" >myfile
[root@windriver-machine shtest]# cat myfile
The log files have all been done
[root@windriver-machine shtest]#

【2】read 可以使用read语句从键盘或者文件中的某一行文本中读入信息,并将其赋给一个变量.

[root@windriver-machine shtest]# read -p "How old r u" age
How old r u32
[root@windriver-machine shtest]# echo $age
32
[root@windriver-machine shtest]# read -p "some words?" -a words
some words?I am a boy
[root@windriver-machine shtest]# echo ${word[*]}

[root@windriver-machine shtest]# echo ${words[*]}
I am a boy
[root@windriver-machine shtest]# read -p "Passowrd:" -s passwd
Passowrd:[root@windriver-machine shtest]# echo $passwd

[root@windriver-machine shtest]# read -n
-bash: read: -n: option requires an argument
read: usage: read [-ers] [-u fd] [-t timeout] [-p prompt] [-a array] [-n nchars] [-d delim] [name ...]
[root@windriver-machine shtest]# read -t 5 auth
sdfasdfas
[root@windriver-machine shtest]# echo $auth
sdfasdfas
[root@windriver-machine shtest]# read -n 1 key
1[root@windriver-machine shtest]#
[root@windriver-machine shtest]# echo $key
1
[root@windriver-machine shtest]# read -dq -p "imput something end with q:" menu
imput something end with q:wobiq[root@windriver-machine shtest]# echo $menu
wobi
[root@windriver-machine shtest]# read -e myfile
hello
[root@windriver-machine shtest]# cat myfile
The log files have all been done
[root@windriver-machine shtest]# read -e myfile
ll
[root@windriver-machine shtest]# read -e myfile testfile

[root@windriver-machine shtest]#

【3】cat 显示文件内容,它显示内容与more和head命令不同,它不会分页显示,而是全

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