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@@ -17,7 +17,36 @@ For example, to make a backup, you can call
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or you can use the builtin command line and
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```
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- cp log.txt log.2021-03-20.bak
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+/$ cp m.log.bak mail.log
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+/$ dir
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+-rwx all 230 boot.py
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+-rwx all 2886 m.log.bak
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+-rwx all 2886 mail.log
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+-rwx all 2401 main.py
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+-rwx all 2259 main_test.py
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+-rwx all 99182 mqtt.log
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+-rwx all 6949 tf.py
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+-rwx all 15 webrepl_cfg.py
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+disk size: 392 KB disk free: 196 KB
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+/$ cat -n -l 1000-1005 mqtt.log
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+====mqtt.log=====
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+1000 1616120701: Client mosq-d911rjWHX3Rdwcntoo disconnected.
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+1001 1616124181: New connection from 72.53.209.21 on port 1883.
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+1002 1616124181: New client connected from 72.53.209.21 as mosq-kwcmiGmZ7jlEVRecrU (c1, k60).
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+1003 1616124181: Client mosq-kwcmiGmZ7jlEVRecrU disconnected.
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+1004 1616126374: Socket error on client DVES_98843E, disconnecting.
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+1005 1616126425: Client DVES_83244E has exceeded timeout, disconnecting.
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+
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+/$ sed x/24\.114\.80/ mqtt.log
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+Lines processed: 1415 Lines modifed: 4
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+/$ cat -n mqtt.log
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+====mqtt.log=====
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+1 1616120273: New connection from 24.114.80.91 on port 1883.
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+2 1616120273: New client connected from 24.114.80.91 as Rutherford1616120233590 (c1, k60, u'patb').
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+3 1616142039: New connection from 24.114.80.109 on port 1883.
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+4 1616142039: New client connected from 24.114.80.109 as Rutherford1616120233590 (c1, k60, u'patb').
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+
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+/$
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```
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The first half of the **TF** module holds the functions. These may come in handy for parsing files, making backups or searching through files.
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