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find . = will set up your recursive search. You can narrow your search to certain file by adding -name "*.ext" or limit buy using the same but add prune like -name "*.ext" -prune
xargs =sets it up like a command line for each file find finds and will invoke the next command which is perl.
perl = invoke perl
-p sets up a while loop
-i in place and the .bak will create a backup file like filename.ext.bak
-e execute the following....
's/ / /;' your basic substitute and replace.
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