# ---
# jupyter:
#   jupytext:
#     text_representation:
#       extension: .py
#       format_name: light
#       format_version: '1.5'
#       jupytext_version: 1.14.4
#   kernelspec:
#     display_name: Python 3
#     language: python
#     name: python3
# ---

# # awk 用法

#  内置变量测试
# ! cat /etc/passwd | head -10 | awk -F":" 'BEGIN{printf("file: %s\n%s", FILENAME, "ABC")}{printf("%04d\t%s\n", NR, $1)}'



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