<h3 id="heading-1-checking-for-free-memory-and-swap-space-on-ubuntu">1. Checking for free memory and swap space on Ubuntu</h3>
<pre><code class="lang-bash">$ free -h
</code></pre>
<h3 id="heading-2-checking-for-free-disk-space-on-ubuntu">2. Checking for free disk space on Ubuntu</h3>
<pre><code class="lang-bash">df -h
</code></pre>
<p>If you want to know disk space up in 1k blocks</p>
<pre><code class="lang-bash">df -a
</code></pre>
<h3 id="heading-3-to-know-which-all-ports-are-in-use-and-by-which-process-pid">3. To know which all ports are in use and by which process (PID)</h3>
<pre><code class="lang-bash">sudo lsof -i -P -n
</code></pre>
<p>OR</p>
<pre><code class="lang-bash">netstat -ano -p tcp
</code></pre>
<p>Don't have the netstat command? Install it using:</p>
<pre><code class="lang-bash">apt install net-tools
</code></pre>
<h3 id="heading-4-find-out-which-process-is-using-a-particular-port">4. Find out which process is using a particular port</h3>
<pre><code class="lang-bash">sudo lsof -i -P -n | grep &lt;port number&gt;
</code></pre>
<p>OR</p>
<pre><code class="lang-bash">netstat -ano -p tcp | grep &lt;port number&gt;
</code></pre>
<h3 id="heading-5-kill-a-process-using-its-pid">5. Kill a process using its PID</h3>
<pre><code class="lang-bash"><span class="hljs-built_in">kill</span> -9 PID
</code></pre>
<h3 id="heading-5-list-details-of-all-ubuntu-partitions">5. List details of all ubuntu partitions</h3>
<pre><code class="lang-bash">sudo fdisk -l
</code></pre>
<p>(That's the lowercase letter L)</p>


### 1\. Checking for free memory and swap space on Ubuntu

```bash
$ free -h
```

### 2\. Checking for free disk space on Ubuntu

```bash
df -h
```

If you want to know disk space up in 1k blocks

```bash
df -a
```

### 3\. To know which all ports are in use and by which process (PID)

```bash
sudo lsof -i -P -n
```

OR

```bash
netstat -ano -p tcp
```

Don't have the netstat command? Install it using:

```bash
apt install net-tools
```

### 4\. Find out which process is using a particular port

```bash
sudo lsof -i -P -n | grep <port number>
```

OR

```bash
netstat -ano -p tcp | grep <port number>
```

### 5\. Kill a process using its PID

```bash
kill -9 PID
```

### 5\. List details of all ubuntu partitions

```bash
sudo fdisk -l
```

(That's the lowercase letter L)

These are Ubuntu commands that I use quite often but don't always remember. So I thought, why not put all of them in one place ?

Frequently used commands on Ubuntu terminal

These are Ubuntu commands that I use quite often but don't always remember. So I thought, why not put all of them in one place ?

Table of contents

1. Checking for free memory and swap space on Ubuntu

2. Checking for free disk space on Ubuntu

3. To know which all ports are in use and by which process (PID)

4. Find out which process is using a particular port

5. Kill a process using its PID

5. List details of all ubuntu partitions