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#compdef sysctl

local -a args

case $OSTYPE in
  freebsd<10->.*)
    args+=(
      '-f+[specify file of name/value pairs to process first]:file:_files'
      '-T[display only variables that are setable via loader]'
      '-W[display only writable variables that are not statistical]'
    )
  ;|
  dragonfly*|freebsd<8->.*)
    args+=( "-i[silently exit if variable doesn't exist]" )
  ;|
  *freebsd<5->.*|freebsd4.[4-9]*)
    local -a sysctlvars
    sysctlvars=( $(_call_program sysctl-variables sysctl -aN) )
    _arguments -s -S -A "-*" $args \
      '(-a -o *)-A[equivalent to -o -a (for compatibility)]' \
      '(*)-a[list all]' \
      '-b[binary output]' \
      '-d[print the description of the variable instead of its value]' \
      '(-N -n)-e[separate name and value with =]' \
      '-h[format output for human readability]' \
      '(-n)-N[show only variable names]' \
      '(-N)-n[show only variable values]' \
      '(-x)-o[show opaques as well (values suppressed)]' \
      '-q[suppress some warnings]' \
      '(* -o)-X[equivalent to -x -a (for compatibility)]' \
      '(-o)-x[show opaques as well (entire values)]' \
      '(-a)*:sysctl variable:_multi_parts -i . sysctlvars'
  ;;
  freebsd[0-4].*|darwin*|dragonfly*)
    : ${(A)_cache_sysctlvars:=${${$(sysctl -A 2>/dev/null):#[^a-z]*}%%:*}}
    _arguments -s -A "-*" $args \
      '(-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 2>/dev/null)"}%%=*}:# *}}
    _arguments -S -s -A "-*" \
      '(-A -q *)-a[list all string and integer variables]' \
      '(-a -q *)-A[list all known variables]' \
      '-n[show only values]' \
      '(-a -A)-q[suppress all output when setting a variable]' \
      '(-a -A)*:sysctl variable:_multi_parts -i -S = -q . _cache_sysctlvars'
  ;;
  *)
    _default
  ;;
esac