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>	Unsafe1. 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.	Unsafe1. printenv2 --pid <PID>
Unix (*BSD)	printenv2 --pid <PID>	Unsafe1. 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.

License

MIT

Footnotes

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. ↩ ↩² ↩³