Fix(guide): Change title of article and add a command

guide/english/linux/10-simple-and-useful-linux-commands/index.md

@@ -1,21 +1,22 @@
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-title: 10 Simple and Useful Linux Commands
+title: Simple and Useful Linux Commands for Daily use and Operations
 ---
-# 10 Simple and Useful Linux Commands
+# Simple and Useful Linux Commands
 The commands listed here are basic, and will help you get started quickly. But they’re also powerful, and they’ll continue to be useful as your Linux expertise expands.
 1. `echo` This takes the text you give it and sends it somewhere—back to the screen, to a file, or to another command. By default it echoes back to the screen, unless used with redirection `>` 
 Example: `echo "hello!"`
 Example 2: `echo "Hello world" > hello.txt`
-1. `cat` To display the contents of a text file, just type `cat myfile`.
+2. `cat` To display the contents of a text file, just type `cat myfile`.
-1. `find` It does what it says, and it’s good at it. Use it to locate files by path, size, date, owner and a bunch of other useful filters. Example: `find . -type f -mtime -1h # List files in this directory modified in the past hour`.
+3. `find` It does what it says, and it’s good at it. Use it to locate files by path, size, date, owner and a bunch of other useful filters. Example: `find . -type f -mtime -1h # List files in this directory modified in the past hour`.
-1. `date` Just type date when you want to know what time it is. Example: `date "+It's %l:%m%p on %A"`. Use it in a script to name files according to the current date.
+4. `date` Just type date when you want to know what time it is. Example: `date "+It's %l:%m%p on %A"`. Use it in a script to name files according to the current date.
-1. `ls` What's in this directory? Combine `ls` with some useful flags to display and sort directory contents by date and size. It also gives you lots of options for formatting the output.
+5. `ls` What's in this directory? Combine `ls` with some useful flags to display and sort directory contents by date and size. It also gives you lots of options for formatting the output.
-1. `pwd` Where am I? Linux can be unforgiving, particularly when you delete something. Make sure you know are before you issue your commands.
+6. `pwd` Where am I? Linux can be unforgiving, particularly when you delete something. Make sure you know are before you issue your commands.
-1. `mail` Linux's mail program isn’t good looking, but it can be really helpful. You can create a message and add text, recipients, and attachments all in one command. Example: `echo "We're having a great time." | mail -s "Wish you were here!" -A postcard.png -t mom@example.com`
+7. `mail` Linux's mail program isn’t good looking, but it can be really helpful. You can create a message and add text, recipients, and attachments all in one command. Example: `echo "We're having a great time." | mail -s "Wish you were here!" -A postcard.png -t mom@example.com`
-1. `cut` When you have a string with separators in it, use `cut` to filter out certain fields. Example: `echo "this, that, and the other" | cut -d, -f2 # "that"`
+8. `cut` When you have a string with separators in it, use `cut` to filter out certain fields. Example: `echo "this, that, and the other" | cut -d, -f2 # "that"`
-1. `grep` To find lines of text that contain a certain string, use grep. Example: `grep 'root' /etc/passwd # root:x:0:0:root:/root:/bin/bash`
+9. `grep` To find lines of text that contain a certain string, use grep. Example: `grep 'root' /etc/passwd # root:x:0:0:root:/root:/bin/bash`
-1. `sed` Use sed to find and change a substring in a piece of text. Example: `echo "this, that, and the other" | sed 's/that/those/' # "this, those, and the other"`
+10. `sed` Use sed to find and change a substring in a piece of text. Example: `echo "this, that, and the other" | sed 's/that/those/' # "this, those, and the other"`
-1. `shutdown` use shut down the system and turn off the power. Example: `shutdown -h now`shuts down system immediately. `shutdown -h +5` shuts down system after five minutes. Alternatively, `shutdown -r` will initate a reboot.
+11. `shutdown` use shut down the system and turn off the power. Example: `shutdown -h now`shuts down system immediately. `shutdown -h +5` shuts down system after five minutes. You can also reboot the system immediately by issuing the command `shutdown -r now`.
+
 
 Use these commands in scripts and at the command line. They're all very powerful commands, and Linux's man page has a lot more information about each one.
 
@@ -53,5 +54,6 @@ more command allows quickly view file and shows details in percentage. You can p
 10. `cp` Command
 Copy file from source to destination preserving same mode.
 
-Here are the list of commands frequently used by adiminstrator.
+11. `systemctl` Command
-This is not a complete but it’s a compact list of commands to refer when needed. 
+
+This is a command which allows operators to work with the Linux system services. The standard use of the command is `systemctl <OPTION> <SERVICE-NAME>` by providing an `OPTION` (e.g. `start`, `stop`, `status`) and than providing a specific Service Name to act on. You can use the command to get a general status of your Linux services (e.g `systemctl status`). Note that you will either need Administrator access or use `sudo` to elevate your rights to run the command successfully.