findstr /c:"77795" 1.txt >2.txt
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@echo off
for /f %%a in (1.txt) do (
    if defined #%%a echo;%%a
    set #%%a=def
)
pause
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@sort 1.txt|uniq -d
@pause
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for /f "delims=" %%i in (1.txt) do findstr /c:"%%i" 2.txt 2>nul&&echo %%i>>2.txt
pause
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gawk "a[$0]++{b[$0]++}END{for(i in b)print $0}" 1.txt
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gawk "{a[$0]++}END{for(i in a)if(a[i]>1)print i}" 1.txt
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gawk "a[$0]++" 1.txt
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