Top 6 Modern Linux Command‑Line Tools to Replace Classic Utilities

ncdu – interactive du replacement

ncdu provides a curses‑based UI to explore disk usage, sorting directories by size. Use the arrow keys to navigate, Enter to open a directory, d to delete files (confirmation by default), and -r for read‑only mode.

ncdu 1.14.2
--- /home/user ------------------------------------------------------------
   96.7 GiB [##########] /libvirt
   33.9 GiB [###       ] /.crc
    7.0 GiB [          ] /Projects
   ... (output truncated) ...
   Total disk usage: 159.4 GiB  Apparent size: 280.8 GiB  Items: 561540

Install on Fedora: sudo dnf install ncdu Project page: https://dev.yorhel.nl/ncdu

htop – enhanced top

htop is an interactive process viewer that adds color, a summary bar, and function‑key commands. Press F2 to open the settings screen where colors, meters, and layout can be customized.

Project page: https://hisham.hm/htop/

tldr – simplified man pages

tldr shows concise examples for common commands, complementing the often verbose man pages. Example for curl:

$ tldr curl
# curl
  Transfers data from or to a server.
  Supports most protocols, including HTTP, FTP, and POP3.
  - Download the contents of an URL to a file:
    curl http://example.com -o filename
  - Download a file, saving the output under the filename indicated by the URL:
    curl -O http://example.com/filename
  - Follow redirects and resume partial downloads:
    curl -O -L -C - http://example.com/filename
  - Send form‑encoded data (POST):
    curl -d 'name=bob' http://example.com/form
  - Send a request with a custom header:
    curl -H 'X-My-Header: 123' -X PUT http://example.com
  - Send JSON data:
    curl -d '{"name":"bob"}' -H 'Content-Type: application/json' http://example.com/users/1234

Install on Fedora: sudo dnf install tldr Project page: https://tldr.sh/

jq – JSON processor

jq parses JSON directly, allowing concise queries that are robust against format changes. Example JSON and queries:

{
  "apiVersion": "v1",
  "kind": "Pod",
  "metadata": {"labels": {"app": "myapp"}, "name": "myapp", "namespace": "project1"},
  "spec": {"containers": [{"name": "busybox"}, {"name": "nginx"}], "restartPolicy": "Never"}
}

List all container names:

jq '.spec.containers[].name' pod.json
"busybox"
"nginx"

Get the second container name:

jq '.spec.containers[1].name' pod.json
"nginx"

Project page: https://stedolan.github.io/jq/

fd – faster find

fd is a simple, fast alternative to find with sensible defaults: case‑insensitive search, colored output, and automatic exclusion of .git directories.

Search for markdown files with find:

find . -iname "*.md"

Same search with fd:

fd .md

Include hidden files when needed:

fd -H .md

Install on Fedora:

sudo dnf install fd-find

Repository: https://github.com/sharkdp/fd/

Summary

These modern replacements for classic Unix tools provide richer interfaces, better defaults, and can streamline daily workflows on Linux desktops and laptops.