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[sindi keesan <keesan AT sdf.lonestar.org>]

> I made a testfile containing hello.
>
>
>
> cat testfile | sed -e "/hello/bye/" > testfile2
> I get the same file copied, with hello not bye.
>
> I tried with and without -e and " "
>
>
> cat testfile | sed /hello/goodbye/ > testfile3
> sed:  Unsupported command o
> I get an empty file.
>
> cat testfile | sed /hello/gbye > testfile4
> sed:  Can't find label for jump to `ye'
>
>
> Where did I go wrong?
>
>
> Sindi

man sed

Searched on substitute and found

[addr2]s/re/replacement/flags

and made a lucky guess at the meaning of it.



cat testfile | sed "s/hello/goodbye/" > testfile2  worked as expected.

You cannot add or subtract slashes but " " is optional here


s is for substitute, and without it the g and b in previous tests are 
misinterpreted?

Thanks to all for the script.

Sindi