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JavaScript and Node.js package manager. Manage Node.js projects and their module dependencies. More information: <https://www.npmjs.com>.

Scan a filesystem for disk usage; create, check and repair quota files. It is best to run quota check with quotas turned off to prevent damage or loss to quota files. More information: <https://manned.org/quotacheck>.

Manage Singularity containers and images. More information: <https://singularity-docs.readthedocs.io/en/latest/#commands>.

Install and remove services which are System-V style init script links. Init scripts are in the /etc/init.d/. More information: <https://manned.org/update-rc.d>.

Command-line interface to the Haskell package infrastructure (Cabal). Manage Haskell projects and Cabal packages from the Hackage package repository. More information: <https://cabal.readthedocs.io/en/latest/intro.html>.

Set a reminder for when it's time to leave. To remove reminders use kill $(pidof leave). More information: <https://www.freebsd.org/cgi/man.cgi?query=leave>.

Send email. More information: <https://manned.org/sendmail>.

Disk usage: estimate and summarize file and directory space usage. More information: <https://www.gnu.org/software/coreutils/du>.