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Using sed I need to replace variables in an HTML document.
The following is what i am using:
cat $email_temp\
| sed 's/\$message_entry/Flex File Export completed successfully for'"$run_date"'./g'\
| sed 's/\$run_date/'"$run_date"'/g'\
| sed 's/\$flex_file_new_count/\'"$flex_file_new_count"'/g'\
| sed 's/\$exported_file_count/'"$exported_file_count"'/g'\
| sed 's/\$date_data/\'"$date_data"'/g'\
| sed 's/\$flex_file_old_count_data/\'"$flex_file_old_count_data"'/g' > $email_body
As pointed out in the comments by @unxnut, there are three escaped single quotes \' in your command which should not be escaped.
Thus sed cannot find the matching closing single quote and fails.
Try this (with quoted variables $email_temp, $email_body and one sed call):
sed -e 's/\$message_entry/Flex File Export completed successfully for'"$run_date"'./g'\
-e 's/\$run_date/'"$run_date"'/g'\
-e 's/\$flex_file_new_count/'"$flex_file_new_count"'/g'\
-e 's/\$exported_file_count/'"$exported_file_count"'/g'\
-e 's/\$date_data/'"$date_data"'/g'\
-e 's/\$flex_file_old_count_data/'"$flex_file_old_count_data"'/g' "$email_temp" > "$email_body"
'character.