Use paste utility to merge lines using tab character as delimiter, expand to convert tabs to spaces and column to format input into multiple columns.
Extract RPM package on macOS to access its contents, which is especially useful for some old source packages.
Display processes using the most CPU or memory using nothing more than basic Linux utilities.
Encrypt portable external hard drive using Linux Unified Key Setup to protect data in transit.
Create simple artifical package to work around missing dependencies,
Create straightforward shell script to resolve hostname to IPv4/IPv6 address and reuse parts of it for other projects.
Use shell script to count separate line entries inside a pipe to see how many entries got filtered out. It can be useful in some scenarios, especially for testing.
Verify package contents by hand or use simple shell script to automate this process.
Recently, I have parsed logs of several applications to generate custom weekly reports. It was very interesting exercise. I created two shell scripts to illustrate the whole idea by parsing HAProxy log files, so I could remember it in the future.
I have already described how to list the contents of specified package using apt-file utility, but you do not need it to check the contents of downloaded package.