Comment by dolmen

Most examples that use '#!/bin/bash' should be rewritten to use '#!/usr/bin/sed -f'.

Example "multiple replacements":

    #!/usr/bin/sed -f
    s/a/A/
    s/foo/BAR/
    s/hello/HELLO/

Save it as replace.sed; chmod u+rx replace.sed; ./replace.sed myfile.txt