====== AWK - Delete both leading and trailing whitespaces from each line ======

<code bash>
awk '{ gsub(/^[ \t]+|[ \t]+$/, ""); print }' file.txt
</code>

----

===== Example =====

<file bash file.txt>
aaaaa
    bbbbb
        ccccc
 ddddd

       eeeee
</file>

returns:

<code bash>
aaaaa
bbbbb
ccccc
ddddd

eeeee
</code>