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chapter 2 module 5 update and fixes

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20
course/content/operating-systems/scripting/bash/README.md
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@ -182,7 +182,7 @@ Permissions are shown in three groups, each group has 3 characters, making up a
* The last set of 3 characters represent others permission * The last set of 3 characters represent others permission
To give our script execute permission `x` , we run `chmod +x setup.sh` To give our script execute permission `x` , we run `sudo chmod +x setup.sh`
``` ```
sudo chmod +x setup.sh sudo chmod +x setup.sh
@ -195,7 +195,7 @@ Now we can execute our script
hello from our script! hello from our script!
``` ```
## Sripting ## Scripting
Now we can finally start scripting. </br> Now we can finally start scripting. </br>
In this module, we'll extend our `setup.sh` script which we will use to setup our website content and basically deploy our website files to a destination folder where a web server could be running from. </br> In this module, we'll extend our `setup.sh` script which we will use to setup our website content and basically deploy our website files to a destination folder where a web server could be running from. </br>
@ -468,6 +468,16 @@ echo "deployed website to $NEW_DEPLOYMENT_DIR"
``` ```
### Error \ Exit code checking
```
if [ $? -ne 0 ]
then
echo "Error: there was an error running the git command"
exit 1
fi
```
### File manipulation ### File manipulation
Now that we have our website files deployed in a unique folder location, we want to tell our web server to serve those new files and not the current ones. </br> Now that we have our website files deployed in a unique folder location, we want to tell our web server to serve those new files and not the current ones. </br>
@ -610,19 +620,19 @@ If you have a process you need to kick off manually that may require secrets lik
This means we don't store sensitive information in our scripts. This means we don't store sensitive information in our scripts.
<i>Important note: DevOps engineers should always avoid storing sensitive information such as API keys, tokens, passwords and authentication details in scripts. <i>Important note: DevOps engineers should always avoid storing sensitive information such as API keys, tokens, passwords and authentication details in scripts.
Auotmation tools for CI/CD & automation pipelines generally allow for a way to pass sensitive details to scripts</i> Automation tools for CI/CD & automation pipelines generally allow for a way to pass sensitive details to scripts</i>
#### Outputs #### Outputs
The pipe operator or `|` is used to pass the output of one command as input to another command. The pipe operator or `|` is used to pass the output of one command as input to another command.
For example, we can grab the content of our website config For example, we can grab the content of our website config
`cat /webites/my-website/nginx.conf` `cat $HOME/webites/my-website/nginx.conf`
Let's say this is a large config file and we only want the `root` section we can pipe it to another command called `grep`. Let's say this is a large config file and we only want the `root` section we can pipe it to another command called `grep`.
[grep](https://en.wikipedia.org/wiki/Grep) is a command-line utility for searching plaintext datasets for lines that match a regular expression [grep](https://en.wikipedia.org/wiki/Grep) is a command-line utility for searching plaintext datasets for lines that match a regular expression
`cat /webites/my-website/nginx.conf | grep 'root'` `cat $HOME/webites/my-website/nginx.conf | grep 'root'`
This command and pipe is useful if you have to search a large file for some specific text. <br/> This command and pipe is useful if you have to search a large file for some specific text. <br/>