To delete trailing whitespace from end of each line:
# sed 's/[ \t]*$//' filename > filename_notrailingspace
To remove all blank lines:
# sed '/^$/d' filename > filename_noblankspace
To remove all leading and trailing whitespace from end of each line:
# sed 's/[ \t]*$//' filename > filename_notrailingspace
To remove all blank lines:
# sed '/^$/d' filename > filename_noblankspace
To remove all leading and trailing whitespace from end of each line:
$ cat filename | sed 's/^[ \t]*//;s/[ \t]*$//' > filename_nospace
