Repository: nvm-sh/nvm
File: nvm.sh (Shell)

Code before:
  PROVIDED_VERSION="${1-}"
  local IS_VERSION_FROM_NVMRC
  IS_VERSION_FROM_NVMRC="${2-}"
  if [ "${PROVIDED_VERSION}" = 'system' ]; then
    if nvm_has_system_iojs || nvm_has_system_node; then
      return 0
    fi
    nvm_err "N/A: no system version of node/io.js is installed."
    return 1
  fi
  local LOCAL_VERSION
  local EXIT_CODE
  LOCAL_VERSION="$(nvm_version "${PROVIDED_VERSION}")"
  EXIT_CODE="$?"
  local NVM_VERSION_DIR
  if [ "${EXIT_CODE}" != "0" ] || ! nvm_is_version_installed "${LOCAL_VERSION}"; then
    if VERSION="$(nvm_resolve_alias "${PROVIDED_VERSION}")"; then
      nvm_err "N/A: version \"${PROVIDED_VERSION} -> ${VERSION}\" is not yet installed."
    else
      local PREFIXED_VERSION
      PREFIXED_VERSION="$(nvm_ensure_version_prefix "${PROVIDED_VERSION}")"
      nvm_err "N/A: version \"${PREFIXED_VERSION:-$PROVIDED_VERSION}\" is not yet installed."
    fi
    nvm_err ""
    if [ "${IS_VERSION_FROM_NVMRC}" != "1" ]; then
        nvm_err "You need to run \"nvm install ${PROVIDED_VERSION}\" to install it before using it."
      else
        nvm_err "You need to run \"nvm install\" to install it before using it."
    fi
    return 1
  fi
}

# Expand a version using the version cache
nvm_version() {
  local PATTERN
  PATTERN="${1-}"
  local VERSION
  # The default version is the current one
  if [ -z "${PATTERN}" ]; then
    PATTERN='current'
  fi

  if [ "${PATTERN}" = "current" ]; then
    nvm_ls_current
    return $?
  fi

  local NVM_NODE_PREFIX
  NVM_NODE_PREFIX="$(nvm_node_prefix)"
  case "_${PATTERN}" in

Review comment (suggestion):
```suggestion
        nvm_err "You need to run \`nvm install ${PROVIDED_VERSION}\` to install and use it."
```

Code after:
  PROVIDED_VERSION="${1-}"
  local IS_VERSION_FROM_NVMRC
  IS_VERSION_FROM_NVMRC="${2-}"
  if [ "${PROVIDED_VERSION}" = 'system' ]; then
    if nvm_has_system_iojs || nvm_has_system_node; then
      return 0
    fi
    nvm_err "N/A: no system version of node/io.js is installed."
    return 1
  fi
  local LOCAL_VERSION
  local EXIT_CODE
  LOCAL_VERSION="$(nvm_version "${PROVIDED_VERSION}")"
  EXIT_CODE="$?"
  local NVM_VERSION_DIR
  if [ "${EXIT_CODE}" != "0" ] || ! nvm_is_version_installed "${LOCAL_VERSION}"; then
    if VERSION="$(nvm_resolve_alias "${PROVIDED_VERSION}")"; then
      nvm_err "N/A: version \"${PROVIDED_VERSION} -> ${VERSION}\" is not yet installed."
    else
      local PREFIXED_VERSION
      PREFIXED_VERSION="$(nvm_ensure_version_prefix "${PROVIDED_VERSION}")"
      nvm_err "N/A: version \"${PREFIXED_VERSION:-$PROVIDED_VERSION}\" is not yet installed."
    fi
    nvm_err ""
    if [ "${IS_VERSION_FROM_NVMRC}" != '1' ]; then
        nvm_err "You need to run \`nvm install ${PROVIDED_VERSION}\` to install and use it."
      else
        nvm_err 'You need to run `nvm install` to install and use the node version specified in `.nvmrc`.'
    fi
    return 1
  fi
}

# Expand a version using the version cache
nvm_version() {
  local PATTERN
  PATTERN="${1-}"
  local VERSION
  # The default version is the current one
  if [ -z "${PATTERN}" ]; then
    PATTERN='current'
  fi

  if [ "${PATTERN}" = "current" ]; then
    nvm_ls_current
    return $?
  fi

  local NVM_NODE_PREFIX
  NVM_NODE_PREFIX="$(nvm_node_prefix)"
  case "_${PATTERN}" in