CODE
## 35. `wget`
Download files.
bash
wget https://example.com/file.zip
CODE
## 36. `ssh`
Remote login.
bash
ssh user@server-ip
CODE
## 37. `scp`
Secure file transfer.
bash
scp app.tar.gz user@server:/tmp
CODE
## 38. `ss`
Socket statistics.
bash
ss -tulnp
CODE
## 39. `dig`
DNS lookup.
bash
dig google.com
CODE
## 40. `nslookup`
DNS troubleshooting.
bash
nslookup google.com
CODE
# 6. Disk & Storage
## 41. `df`
Disk usage.
bash
df -h
CODE
## 42. `du`
Directory size.
bash
du -sh /var/log
CODE
## 43. `lsblk`
Block devices.
bash
lsblk
CODE
## 44. `mount`
Mount filesystem.
bash
mount /dev/sdb1 /mnt
CODE
## 45. `umount`
Unmount filesystem.
bash
umount /mnt
CODE
# 7. System Information
## 46. `uname`
Kernel/system info.
bash
uname -a
CODE
## 47. `hostname`
Machine name.
bash
hostname
CODE
## 48. `whoami`
Current user.
bash
whoami
CODE
## 49. `uptime`
System uptime/load.
bash
uptime
CODE
## 50. `free`
Memory usage.
bash
free -h
CODE
# Final Thoughts
Linux commands are the foundation of DevOps work.
You don’t need to memorize everything on day one—but becoming comfortable with these commands will make your life significantly easier in real-world infrastructure, automation, and troubleshooting tasks.
**Which Linux command do you use every day? Drop it in the comments.**
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