The easiest way to replace white spaces with underscores in bash

Question

recently I had to write a little script that parsed VMs in XenServer and as the names of the VMs are mostly with white spaces in e g Windows XP or Windows Server 2008  I had to trim those white spaces and replace them with underscores     I found a simple solution to do this using sed which is great tool when it comes to string manipulation  echo  quot This is just a test quot    sed -e  s     g   returns This is just a test  Are there other ways to accomplish this

User · Answer

This is borderline programming  but look into using tr     echo  this is just a test    tr -s       tr           Should do it  The first invocation squeezes the spaces down  the second replaces with underscore  You probably need to add TABs and other whitespace characters  this is for spaces only

User · Answer

You can do it using only the shell  no need for tr or sed    str  This is just a test    echo   str       This is just a test

[bash] The easiest way to replace white spaces with (underscores) _ in bash

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