Shulou(Shulou.com)06/02 Report--

1, alias setting alias--network card, single quotation marks and double quotation marks are OK, this is a temporary configuration, does not take effect after restarting

Permanently effective vim /etc/profile Add something at the end

Use the command source /etc/profile to validate the configuration

2, grep filter file content

-n Display line numbers and content

-w Search by word

-i ignore case

-v negated or excluded, filtering out content that does not contain #

The above parameters can be used in combination such as: -ni -nwiv

3. tr substitution with

Change all lowercase letters to uppercase

Replace a with 1, b with 2, c with 3, one by one correspondence

Command line use, generally not yet effective

Add absolute path or\cancel alias, copy directly without prompting overwrite

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