rm： move(rename) files
cat: concatenate files and print on the stantard output 由第一行开始显示文件内容
-n(--number)：number all output lines 打印行号（不论空行还是非空行）
-b(--number -nonblank)： number nonempty output lines,overrides -n 打印行号（仅非空行）
-A(--show-all)： equivalent to -vET 可以显示特殊字符，而不是显示空白
将文件bashrc 移动都到mvtest目录下
cd /tmp
cp ~/.bashrc bashrc
mkdir mvtest
ls -ld bashrc mvtest
-rw-r----- 1 root root 1177 Aug 15 10:16 bashrc
drwxr-xr-x 2 root root 4096 Aug 15 10:17 mvtest
mv bashrc mvtest
ls -ld bashrc mvtest
ls: cannot access bashrc: No such file or directory
drwxr-xr-x 2 root root 4096 Aug 15 10:18 mvtest
cd mvtest
ls -l
-rw-r----- 1 root root 1177 Aug 15 10:16 bashrc
重命名目录名称
mkdir mvtest1
ls -ld mvtest1
drwxr-xr-x 2 root root 4096 Aug 15 10:24 mvtest1
mv mvtest1 mvtest2
ls -ld mvtest1 mvtest2
ls: cannot access mvtest1: No such file or directory
drwxr-xr-x 3 root root 4096 Aug 15 10:24 mvtest2
将两个文件bashrc_1,bahsrc_2都移动到目录mvtest2下
cp ~/.bashrc bashrc_1
cp ~/.bashrc bashrc_2
mkdir mvtest2
mv bashrc_1 bashrc_2 mvtest2
ls -l bashrc_1 bahsrc_2 mvtest2
ls: cannot access bashrc_1: No such file or directory
ls: cannot access bashrc_2: No such file or directory
mvtest2:
total 8
-rw-r----- 1 root root 1177 Aug 15 10:30 bashrc_1
-rw-r----- 1 root root 1177 Aug 15 10:31 bashrc_2
cd /etc/sysconfig/network
pwd
/etc/sysconfig/network
bashename /etc/sysconfig/network
network
dirname /etc/sysconfig/network
/etc/sysconfig
basename：文件名
dirname：目录名
cat /etc/issue
cat -n /etc/issue