General Linux · easy · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/environment to set three system-wide variables read by PAM at login: EDITOR=vim, LANG=en_US.UTF-8, and a PATH that includes the standard sbin/bin directories plus /usr/local/bin (e.g. /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin). /etc/environment is a plain KEY=value file (no 'export', no shell syntax, no variable expansion). (Authored config, graded structurally — the engine isn't run here.)
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Core Linux fundamentals: files, users, groups, permissions and everyday administration.
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