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#compdef sysctl

case $OSTYPE in
  freebsd[5-9].*|freebsd4.[4-9]*)
    local -a sysctlvars
    sysctlvars=( $(sysctl -aN) )
    _arguments -s -A "-*" \
      '(*)-a[list all]' \
      '-b[binary output]' \
      '(-n)-N[show only variable names]' \
      '(-N)-n[show only variable values]' \
      '(-x)-o[show opaques as well (values suppressed)]' \
      '(-o)-x[show opaques as well (entire values)]' \
      '(-a)*:sysctl variable:_multi_parts -i . sysctlvars'
  ;;
  freebsd[0-4].*|darwin*)
    : ${(A)_cache_sysctlvars:=${${$(sysctl -A 2>/dev/null):#[^a-z]*}%%:*}}
    _arguments -s -A "-*" \
      '(-w -X *)-a[list all]' \
      '(-w -X *)-A[show all opaques (values suppressed)]' \
      '(-w)-b[binary output]' \
      '(-w)-n[show only variable values]' \
      '(-a -A -b -n -X)-w[write mode]' \
      '(-a -A -w *)-X[show all opaques (entire values)]' \
      '(-a -A -X)*:sysctl variable:_multi_parts ${words[(r)-w]:+-S=} -i . _cache_sysctlvars'
  ;;
  linux*)
    _arguments -A "-*" \
      '-n[show only variable values]' \
      '(-n -p -a -A)-w[write mode]' \
      '(-n -w -a -A *)-p[specify file to load sysctl settings from]:file:_files' \
      '(-n -w -p -A *)-a[list all]' \
      '(-n -w -p -a *)-A[list all in table form]' \
      '(-n -p -a -A)*:sysctl variable:_files -W /proc/sys'
  ;;
  openbsd*)
    : ${(A)_cache_sysctlvars:=${${(f)"$(sysctl -a)"}%% *}}
    _arguments -s -A "-*" \
      '(-w -A *)-a[list all string and integer variables]' \
      '(-w -a *)-A[list all known variables]' \
      '(-w)-n[show only values]' \
      '(-a -A -n)-w[write variable]' \
      '(-a -A)*:sysctl variable:_multi_parts ${words[(r)-w]:+-S=} -i . _cache_sysctlvars'
    ;;
esac