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of the current profile, e.g.,
$ nix-env --list-generations
...
39 2004-02-02 17:53:53
40 2004-02-02 17:55:18
41 2004-02-02 17:55:41
42 2004-02-02 17:55:50 (current)
$ nix-env --switch-generation 39
$ ls -l /nix/var/nix/profiles/default
... default -> default-39-link
* Also a command `--rollback' which is just a convenience operation to
rollback to the oldest generation younger than the current one.
Note that generations properly form a tree. E.g., if after
switching to generation 39, we perform an installation action,
a generation 43 is created which is a descendant of 39, not 42. So
a rollback from 43 ought to go back to 39. This is not currently
implemented; generations form a linear sequence.
41 lines
1.4 KiB
Text
41 lines
1.4 KiB
Text
nix-env [OPTIONS...] [ARGUMENTS...]
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`nix-env' is a tool to manipulate Nix user environments.
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Operations:
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--install / -i: add derivations to the user environment
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--upgrade / -u: upgrade derivation in the user environment
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--uninstall / -e: remove derivations from the user environment
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--query / -q: perform a query on an environment or Nix expression
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The previous operations take a list of derivation names. The special
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name `*' may be used to indicate all derivations.
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--switch-profile / -S [FILE]: switch to specified profile
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--switch-generation / -G NUMBER: switch to specified generation of profile
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--rollback: switch to the previous generation
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--list-generations: list available generations of a profile
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--import / -I FILE: set default Nix expression
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--version: output version information
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--help: display help
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Query types:
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--name: print derivation names (default)
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--expr: print derivation store expression
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--status / -s: print installed/present status
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Query sources:
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--installed: use installed derivations (default)
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--available / -a: use derivations available in Nix expression
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Options:
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--profile / -p LINK: use specified profile instead of target of ~/.nix-profile
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--file / -f FILE: use Nix expression FILE for installation, etc.
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--verbose / -v: verbose operation (may be repeated)
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--keep-failed / -K: keep temporary directories of failed builds
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