pseudo `pip-upgrade`

pip-upgrade.sh

#!/usr/bin/env bash
# pseudo `pip upgrade`
# @version  2022.12.12.1
# @license  CC0 Univ PD https://creativecommons.org/publicdomain/zero/1.0/
# @author   noromanba   https://noromanba.github.io

set -eCx

# always backup
requirements=~/requirements.txt
pip freeze | tee "$requirements"
# pseudo pip-upgrade
#   short option for BusyBox e.g. Termux
# upgrade
pip list | \
  # --lines='+3'
  tail -n '+3' | \
  # [^1] pip 22.0+ notice truncate
  sed '/^\s*$/,$d' | \
  # --fields=1 --delimiter=' '
  cut -f 1 -d ' ' | \
  # prevent updates
  #sed 's/<PACKAGE_NAME>//'| \
  xargs pip install --upgrade

# DEV
# [^1]: `pip list` annoying notice put to *stdout* if not installed latest pip package from v22+, notice only pip
#
# ```
# $ pip list 
# Package        Version
# -------------- ----------
# pip            22.2
# setuptools     63.3.0
# 
# [notice] A new release of pip available: 22.2 -> 22.2.1
# [notice] To update, run: pip install --upgrade pip
# $
# ```
#
# WTH
# after install latest pip
#
# ```
# $ pip list 
# Package        Version
# -------------- ----------
# pip            22.2.1
# setuptools     63.3.0
# $
# ```