学习小组Day2笔记补充--April

以下为代码

[root@April ~]# pwd
/root
[root@April ~]# mkdir test
[root@April ~]# ls
biosoft  project  src  test  tmp
[root@April ~]# mkdir april
[root@April ~]# cd april
[root@April april]# touch hello.txt
[root@April april]# cd ..
[root@April ~]# cd test
[root@April test]# touch byebye.txt
[root@April test]# cd
[root@April ~]# ls
april  biosoft  project  src  test  tmp
[root@April ~]# rm hello.txt
rm: cannot remove ‘hello.txt’: No such file or directory
[root@April ~]# cd april
[root@April april]# rm hello.txt
rm: remove regular empty file ‘hello.txt’? y
[root@April april]# rmdir april
rmdir: failed to remove ‘april’: No such file or directory
[root@April april]# cd
[root@April ~]# rmdir april
[root@April ~]# rm -r test
rm: descend into directory ‘test’? y
rm: remove regular empty file ‘test/byebye.txt’? y
rm: remove directory ‘test’? y
[root@April ~]# ls
biosoft  project  src  tmp
[root@April ~]# cd tmp
[root@April tmp]# pwd
/root/tmp
[root@April tmp]# cd ~
[root@April ~]# cd tmp
[root@April tmp]# vi hello.txt
[root@April tmp]# cat hello.txt
Today
is
a
good
day
It
is
a
little
hot
but
still
a
nice
day
tomorrow
is
a
rainy
day
[root@April tmp]# cat -n hello.txt
     1  Today
     2  is
     3  a
     4  good
     5  day
     6  It
     7  is
     8  a
     9  little
    10  hot
    11  but
    12  still
    13  a
    14  nice
    15  day
    16  tomorrow
    17  is
    18  a
    19  rainy
    20  day
[root@April tmp]# head -n3 hello.txt
Today
is
a
[root@April tmp]# tail -n3 hello.txt
a
rainy
day
[root@April tmp]# cp hello.txt byebye.txt
[root@April tmp]# mv byebye.txt home.txt
[root@April tmp]# mv home.txt ~
[root@April tmp]# cd
[root@April ~]# ls
biosoft  home.txt  project  src  tmp

1）要关注前面的目录名称（有pwd查看也行），只能在当前目录下进行操作。
2）输出结果：目录为蓝色，文件为白色。
3）主路径为~，一般路径为 /root/dirname.