Linux:echo、read、cat命令

1、echo

  不换行 -n

• 举例：echo –n “My name is:”

   执行命令：

      举例：

kevin@kevin:~/mybash$ echo "My home dir is:$HOME  my current dir is:`pwd`"
My home dir is:/home/kevin  my current dir is:/home/kevin/mybash
kevin@kevin:~/mybash$

2、read

用于给变更赋值

kevin@kevin:~/mybash$ read myname
kevin
kevin@kevin:~/mybash$ echo $myname
kevin
kevin@kevin:~/mybash$ read yourname age address
kevin 30 beijing.china
kevin@kevin:~/mybash$ echo $yourname
kevin
kevin@kevin:~/mybash$ echo $age
30
kevin@kevin:~/mybash$ echo $address
beijing.china
kevin@kevin:~/mybash$

3、cat

  1、创件文件

kevin@kevin:~/mybash$ cat > tmplog
create file by cat
kevin@kevin:~/mybash$ ll
总用量 16
drwxr-xr-x  2 kevin kevin 4096 2012-09-15 16:08 ./
drwxr-xr-x 44 kevin kevin 4096 2012-09-15 15:43 ../
-rwxr-xr-x  1 kevin kevin   47 2012-09-15 15:43 test.sh*
-rw-r--r--  1 kevin kevin   19 2012-09-15 16:08 tmplog

2、查看文件，合并多个文件

kevin@kevin:~/mybash$ ll
总用量 16
drwxr-xr-x  2 kevin kevin 4096 2012-09-15 16:08 ./
drwxr-xr-x 44 kevin kevin 4096 2012-09-15 15:43 ../
-rwxr-xr-x  1 kevin kevin   47 2012-09-15 15:43 test.sh*
-rw-r--r--  1 kevin kevin   19 2012-09-15 16:08 tmplog
kevin@kevin:~/mybash$ cat tmplog
create file by cat
kevin@kevin:~/mybash$ cat tmplog test.sh > all.log
kevin@kevin:~/mybash$ ll
总用量 20
drwxr-xr-x  2 kevin kevin 4096 2012-09-15 16:11 ./
drwxr-xr-x 44 kevin kevin 4096 2012-09-15 15:43 ../
-rw-r--r--  1 kevin kevin   66 2012-09-15 16:11 all.log
-rwxr-xr-x  1 kevin kevin   47 2012-09-15 15:43 test.sh*
-rw-r--r--  1 kevin kevin   19 2012-09-15 16:08 tmplog
kevin@kevin:~/mybash$ cat all.log
create file by cat
#/usr/bin/bash

echo "My name is:\c"
read name
kevin@kevin:~/mybash$