uniq命令的作用:显示唯一的行,对于那些连续重复的行只显示一次!
boy took bat home boy took bat home girl took bat home dog brought hat home dog brought hat home dog brought hat home
boy took bat home girl took bat home dog brought hat home
2 boy took bat home 1 girl took bat home 3 dog brought hat home
boy took bat home dog brought hat home
girl took bat home
boy took bat home
boy took bat home dog brought hat home
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