async function run(ctx, argv) {
  let posix = false
  let strict = false
  const paths = []
  for (let i = 1; i < argv.length; i++) {
    const a = argv[i]
    if (a === '-p') {
      posix = true
      continue
    }
    if (a === '-P') {
      strict = true
      continue
    }
    if (a === '--') {
      paths.push(...argv.slice(i + 1))
      break
    }
    if (a.startsWith('-')) {
      ctx.console.error('pathchk: unsupported option ' + a)
      ctx.exitCode = 1
      return
    }
    paths.push(a)
  }
  if (!paths.length) {
    ctx.console.error('pathchk: missing operand')
    ctx.exitCode = 1
    return
  }
  for (const p of paths) {
    if (strict && !p.length) {
      ctx.console.error('pathchk: empty path name')
      ctx.exitCode = 1
      continue
    }
    if (!p.length) {
      ctx.console.error('pathchk: empty path name')
      continue
    }
    if (p.length > 4096) {
      ctx.console.error('pathchk: path too long')
      ctx.exitCode = 1
      continue
    }
    if (p.includes('\0')) {
      ctx.console.error('pathchk: NUL in path')
      ctx.exitCode = 1
      continue
    }
    if (strict && p.startsWith('-')) {
      ctx.console.error('pathchk: leading hyphen in path')
      ctx.exitCode = 1
      continue
    }
    if (posix) {
      const base = p.split('/').pop() || p
      if (base !== '.' && base !== '..' && !/^[A-Za-z0-9._-]+$/.test(base)) {
        ctx.console.error('pathchk: non-portable file name ' + base)
        ctx.exitCode = 1
      }
    }
  }
}