[Help-bash] Overwriting of data in a file

[Greg Wooledge]

The problem is that an entry like "/root" will overwrite an exiting entry
or "/root/.cshrc" therefore creating a double entry for "/root" and adding
a new entry for "/root/.cshrc".

Simply rewrite the ENTIRE file. Done.

PERMFILE=permissions.local
for VAL in ${ELMT[*]}; do

STOP using all-caps variable names.

sed -i

Editing files with a shell script is just fundamentally broken. Don't
try it. Write the entire new file out.