Redirection
Redirection to a file should have a single space after the operator before the file. If the file contains a variable, it should be quoted. File descriptor alterations should have no whitespace. All redirections should occur at the end of the line. Do not quote static paths unless they contain special characters (~!#$*();`'"<>?\).
exec 3<&1
echo 123 > somefile
echo 456 >> somefile
echo abc > "$file"
echo def >> "$file"
kill -1 "$pid" > /dev/null 2>&1
Here document redirections should appear at the end of the line.
cat >> file <<EOF
Added to file
EOF
if some condition; then
cat >> file <<-EOF
Added to file
EOF
fi
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