Rhcsa day 3 operation

1、 Create directory test

In two ways test Create a text file in the directory text1.txt,text.txt

[root@localhost ~]# mkdir test
[root@localhost ~]# cd test
[root@localhost test]# touch text1.txt
[root@localhost test]# vim text.txt
[root@localhost test]# ls
text1.txt  text.txt

Use vim In the file text.txt writes

Welcome to my Linux. ​ You are the best. ​ This is my first file to create on linux.

[root@localhost test]# vim text.txt
# Get into vim After editor , Press a Key to enter edit mode , When the input is complete, press Esc Key to exit edit mode , Press again :wq Save and exit vim
Welcome to my Linux.
You are the best.
This is my first file to create on linux.

set nu , And put it in the text my Replace with your, Save the file as new_test1.txt

# Get into vim Post press : key , Enter last line mode , Input set nu set nu 
# Enter... In last line mode %s/my/your/g, You can put the in the full text my Replace with your 
# Enter... In last line mode w new_test1.txt, You can save the file as 

take test Copy the files in to test2 Catalog

[root@localhost ~]# cp -a test test2

take test2 In the directory text1.txt Rename it to text111.txt

[root@localhost ~]# cd test2
[root@localhost test2]# mv text1.txt text111.txt

stay test2 Create a new text111.txt Soft link file for test111Symb.txt

 [root@localhost test2]# ln -s text111.txt test111symb.txt

stay test2 Create a new test111.tbxt Hard link file for test111hard.txt

[root@localhost test2]# ln text111.txt test111hard.txt

Delete test Directory test1.txt

[root@localhost test]# rm -rf test1.txt

Delete test Catalog

[root@localhost ~]# rm -rf test

2、 take echo"This is my first time to use pipe" Output content to the screen , And save it to pipe_data.txt in

[root@localhost ~]# echo "This is my first time to use pipe" | tee pipe_data.txt
This is my first time to use pipe
[root@localhost ~]# more pipe_data.txt
This is my first time to use pipe

3、 File content browsing

a.cat see /etc/passwd The contents of the document , And output with line number

[root@localhost ~]# cat -n /etc/passwd

b. Use more/less see /etc/passwd Content , And each page displays 10 That's ok

more command ：
[root@localhost ~]# more -10 /etc/passwd
less command ：
[root@localhost ~]# less -10 /etc/passwd

c. Use head/tail Before viewing the files separately 5 Line content and after 5 Row content

head Command before viewing the file 5 Row content ：
[root@localhost ~]# head -5 /etc/passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
tail Command to view the file 5 Row content ：
[root@localhost ~]# tail -5 /etc/passwd
gdm:x:42:42::/var/lib/gdm:/sbin/nologin
gnome-initial-setup:x:975:975::/run/gnome-initial-setup/:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
redhat:x:1000:1000:redhat:/home/redhat:/bin/bash