Repos-que-me-gustan/devops-exercises
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Merge pull request #48 from surister/new_linux_answers

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New linux answers
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Arie Bregman 2019-11-29 14:01:22 +02:00 committed by GitHub
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@ -800,7 +800,22 @@ TCP establishes a connection between the client and the server to guarantee the
<details>
<summary>Running the command <code>df</code> you get "command not found". What could be wrong and how to fix it?</summary><br><b>
</b></details>
</b>
<p><b>
Most likely the default/generated $PATH was somehow modified or overridden thus not containing <code>/bin/</code> where df would normally go.
This issue could also happen if bash_profile or any configuration file of your interpreter was wrongly modified, causing erratics behaviours.
You would solve this by fixing your $PATH variable:
As to fix it there are serveral options:
1. Manually adding what you need to your $PATH <code>PATH="$PATH":/user/bin:/..etc</code>
2. You have your weird env variables backed up.
3. You would look for your distro default $PATH variable, copy paste using method #1
Note: There are many ways of getting errors like this: if bash_profile or any configuration file of your interpreter was wrongly modified; causing erratics behaviours,
permissions issues, bad compiled software (if you compiled it by yourself)... there is no answer that will be true 100% of the time.</b>
</p>
</details>
<details>
<summary>How to make sure a service will start on a OS of your choice?</summary><br><b>
@ -816,8 +831,7 @@ With cron, tasks are scheduled using the following format:
<minute> <hour> <day of month> <month> <day of week> <command to execute>
The tasks are stored in a cron file.
The tasks are stored in a cron file, you can write in it using <code>crontab -e</code>
Alternatively if you are using a distro with systemd it's recommended to use systemd timers.
@ -828,6 +842,8 @@ Alternatively if you are using a distro with systemd it's recommended to use sys
Normally you will schedule batch jobs.
</b></details>
##### Permissions
@ -1034,8 +1050,13 @@ Soft links can be created between different file systems while hard link can be
<summary>Fix the following commands:
* sed "s/1/2/g' /tmp/myFile
* find . -iname \*.yaml -exec sed -i "s/1/2/g" {} ;</summary><br><b>
</b></details>
* find . -iname \*.yaml -exec sed -i "s/1/2/g" {} ;
</summary><br><b>
</b>
<code>sed 's/1/2/g' /tmp/myFile</code><br>
<code> find . -iname "*.yaml" -exec sed -i "s/1/2/g" {} \; </code>
</details>
<details>
<summary>Explain what is stored in each of the following paths and if there is anything unique about it:</summary><br><b>
@ -1067,10 +1088,11 @@ execution or run forever
<details>
<summary>What signal is used when you run 'kill <process id>'?</summary><br><b>
<pre>
The default signal is SIGTERM (15). This signal kills
process gracefully which means it allows it to save current
state configuration.
</pre>
</b></details>
<details>
@ -1097,12 +1119,13 @@ To view all available signals run `kill -l`
<details>
<summary>What are the possible states of a process in Linux?</summary><br><b>
<pre>
Running
Waiting
Stopped
Terminated
Zombie
</pre>
</b></details>
<details>