7 releases

0.1.3	Jan 24, 2024
0.1.1	Apr 13, 2023
0.1.0	Aug 17, 2022
0.0.4	Aug 5, 2022
0.0.2	May 8, 2022

#2752 in Command line utilities

MIT license

47KB
1.5K SLoC

printenv2

A printenv rewrite in Rust.

Advantages over classic implementations

Rich-format output
- Colored mode
- Sort mode: output can be sorted by environment variable names
- Escape mode:
  - Single-line: escape line break characters
  - Unprintable characters
- JSON mode
Remote mode. See notes
Cross-platform

Installation

via package managers:
- Arch Linux: paru -S printenv2
via Cargo: Run cargo install printenv2 if you already have Rust development environment setup.

Notes on Remote Mode

printenv2 can read environment variables of another running process.

Basic usage:

# Make sure you have the privilege to inspect the target process.
printenv2 --pid 1000

Platform-specifics:

Platform	Environment variables at startup	Environment variables in present
Linux	`printenv2 --pid <PID>`	Unsafe[^1]. `printenv2 --debugger-helper` generates a shell script for that using `gdb`. `sh <(printenv2 --debugger-helper=gdb) <PID> \| printenv2 --load -`. `sudo` is likely required.
Windows	Unsupported.	Unsafe[^1]. `printenv2 --pid <PID>`
Unix (*BSD)	`printenv2 --pid <PID>`	Unsafe[^1]. `printenv2 --debugger-helper` generates a shell script for that using `gdb`. `sh <(printenv2 --debugger-helper=gdb) <PID> \| printenv2 --load -`. `sudo` is likely required.
macOS	`printenv2 --pid <PID>`	Unsupported.
Other	Unsupported.	Unsupported.

[^1]: Be careful. These methods either requires the process to be suspended for memory access; or they use undocumented APIs which may not work in the future.

License

MIT

Dependencies

~2–47MB
~696K SLoC