Use sed to delete all leading/following blank spaces in a text file

Question

File1:

  hello  
  world  

How would one delete the leading/trailing blank spaces within this file using sed - using one command (n

Answer 1

perl -lape 's/^\s+|\s+$//g'

Honestly, I know perl regexps the best, so I find perl -lape much easier to use than sed -e.

Also, to answer the original question, you can have sed execute multiple operations like this:

sed -e 's/something/something else/' -e 's/another substitution/another replacement/'

Apparently you can also put the two substitutions in one string and separate them with a semicolon, as indicated in another answer.