@Humpleupagus @matty @tyler Uhh, please excuse my rank n00btardery, but the following, and also when I checked if I even have fs:

$ fs
bash: fs: command not found

---

> How do you use the Linux terminal command fs to look at an ISO file?

The `fs` command you're asking about doesn't exist as a standard Linux command. However, there are several ways to examine and work with ISO files in the Linux terminal. Here are the most common approaches:

## 1. **Mount the ISO file** (Most Common)
```bash
# Create a mount point
sudo mkdir /mnt/iso

# Mount the ISO file
sudo mount -o loop filename.iso /mnt/iso

# Browse the contents
ls -la /mnt/iso/

# When done, unmount it
sudo umount /mnt/iso
```

## 2. **Use `isoinfo`** (Examine without mounting)
```bash
# Show basic ISO information
isoinfo -d -i filename.iso

# List all files in the ISO
isoinfo -l -i filename.iso

# Extract a specific file
isoinfo -i filename.iso -x /path/to/file
```

## 3. **Use `file` command** (Identify file type)
```bash
file filename.iso
```

## 4. **Use `7z` or `bsdtar`** (Extract contents)
```bash
# Using 7z
7z x filename.iso

# Using bsdtar
bsdtar -xf filename.iso
```

## Installation if tools are missing:
```bash
# For isoinfo (usually in genisoimage or cdrtools package)
sudo apt install genisoimage # Debian/Ubuntu
sudo yum install genisoimage # CentOS/RHEL

# For 7z
sudo apt install p7zip-full # Debian/Ubuntu
sudo yum install p7zip # CentOS/RHEL

# For bsdtar
sudo apt install libarchive-tools # Debian/Ubuntu
```

The **mount method** is typically the most useful as it gives you full read access to the ISO's file system as if it were a physical disc.

Were you perhaps thinking of a different command, or is there something specific you're trying to accomplish with the ISO file?