WebMar 12, 2024 · 您好,这是一个关于 Python 的问题。当命令行参数的个数不符时,可以使用 argparse 模块来实现。以下是一个示例代码: ```python import argparse parser = argparse.ArgumentParser(description='Encrypt or decrypt a file with a password.') parser.add_argument('filename', metavar='FileName', type=str, help='the name of the file … WebSep 7, 2024 · $ sed -e 's/line2/line2\ #this line was added by sed/' file line1 line2 #this line was added by sed line3 line4 UPDATE: In csh, this last option requires an additional \: % sed -e 's/line2/line2\\ #this line was added by sed/' file line1 line2 #this line was added by sed line3 line4 Share Improve this answer edited Sep 7, 2024 at 6:42
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