lix/src/nix-env/help.txt

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nix-env [OPTIONS...] [ARGUMENTS...]
`nix-env' is a tool to manipulate Nix user environments.
Operations:
--install / -i: add derivations to the user environment
--upgrade / -u: upgrade derivation in the user environment
--uninstall / -e: remove derivations from the user environment
--query / -q: perform a query on an environment or Nix expression
The previous operations take a list of derivation names. The special
name `*' may be used to indicate all derivations.
--profile / -p [FILE]: switch to specified user environment
--import / -I FILE: set default Nix expression
--version: output version information
--help: display help
Query types:
--name: print derivation names (default)
--expr: print derivation store expression
--status / -s: print installed/present status
Query sources:
--installed: use installed derivations (default)
--available / -a: use derivations available in Nix expression
Options:
--link / -l LINK: use symlink LINK instead of (...)/current
--file / -f FILE: use Nix expression FILE for installation, etc.
--verbose / -v: verbose operation (may be repeated)
--keep-failed / -K: keep temporary directories of failed builds