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How to change permissions of specific file extensions in Linux

Change specific file extensions in Linux, there are many ways to do this although some work better than others

Try this (where .xls is the extension):

1) In current working directory:
find . -type f -name "*.xls" | xargs chmod 755

2) Or specify from the root dir:
find /path/to/that/dir -type f -name "*.xls" | xargs chmod 755

chmod Permissions chart

PERMISSIONS COMMAND
USER GROUP WORLD  
rwx rwx rwx chmod 777
rwx rwx r-x chmod 775
rwx r-x r-x chmod 755
rw- rw- r– chmod 664
rw r– r– chmod 644

More Information A great how to for Linux File and Folder permissions

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