What does mean in Windows batch scripts

Question

I saw   is used in such contexts    echo off   echo start eclipse exe   What does   mean here

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Another useful time to include   is when you use FOR in the command line  For example   FOR  F IN       DO ECHO  F   Previous line show for every file  the command prompt  the ECHO command  and the result of ECHO command  This way   FOR  F IN       DO  ECHO  F   Just the result of ECHO command is shown

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you can include   in a  scriptBlock  like this        echo don t echoed   hostname   echo echoed   and especially do not do that     for   a in       do    aecho    a

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In batch file  1  echo off solo   gt output nothing  2 echo off solo   gt  the    echo off    shows in the command line  3 echo off then echo something    gt   4  echo off then echo something   gt   See  echo off solo   means no output in the command line  but itself shows   echo off solo   means no output in the command line  neither itself

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By default  a batch file will display its command as it runs  The purpose of this first command which  echo off is to turn off this display  The command  echo off  turns off the display for the whole script  except for the  echo off  command itself  The  at  sign     in front makes the command apply to itself as well

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It inherits the meaning from DOS         In DOS version 3 3 and later  hides the echo of a batch command  Any output generated by the command is echoed    Without it  you could turn off command echoing using the echo off command  but that command would be echoed first

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It means  don t echo the command to standard output     Rather strangely    echo off   will send echo off to the output  So     echo off   sets this automatic echo behaviour off - and stops it for all future commands  too   Source  http   www microsoft com resources documentation windows xp all proddocs en-us batch mspx mfr true

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The   disables echo for that one command  Without it  the echo start eclipse exe line would print both the intended start eclipse exe and the echo start eclipse exe line   The echo off turns off the by-default command echoing   So  echo off silently turns off command echoing  and only output the batch author intended to be written is actually written

User · Answer

It means not to output the respective command  Compare the following two batch files    echo foo   and  echo foo   The former has only foo as output while the latter prints  H  Stuff gt echo foo  foo    here  at least   As can be seen the command that is run is visible  too   echo off will turn this off for the complete batch file  However  the echo off call itself would still be visible  Which is why you see  echo off in the beginning of batch files  Turn off command echoing and don t echo the command turning it off   Removing that line  or commenting it out  is often a helpful debugging tool in more complex batch files as you can see what is run prior to an error message

[windows] What does "@" mean in Windows batch scripts

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