Very Computer

I want to use touch  or  any available  tool on Solaris 7 to change the time
and date
on  all files in a source  directory and its  subdirectory in  one shot.

Any help appreciated.

Does "one shot" mean one executable invocation?  It's going to have to
be separate system calls, I think.

Anyway, I'd use Perl.  This is basically equivalent to "touch *.c *.h":

You can use your own value for "$now" instead of setting it to the
current time, although it's a bit of a bad user interface since you
have to supply a time_t.  If you want, you can read the time from
another file by using the Perl stat() function.  I don't know exactly
what your goal is...

  - Logan
--
"In order to be prepared to hope in what does not deceive,
 we must first lose hope in everything that deceives."

                                          Georges Bernanos

touch `find .`
or
find . -exec touch {} \;

Now that I've posted this, I realize you can do it with "touch", so
using Perl is pointless and unnecessary.  I took the question to mean
that "touch" couldn't do it, when in fact it can, and more conveniently
and efficiently than Perl in most cases.

The original poster's question is apparently how to give multiple
filenames in the current directory and a subdirectory to a command,
in which case the answer is something like this:

    # make the shell build the list of files
    touch *.c subdir/*.c

or (as someone else has already said) this:

    # make find build the list of files, and make the shell put it
    # on touch's command line
    touch `find . -type f -name '*.c' -print`

or this:

    # make find build the list of files, and make xargs put it
    # on touch's command line
    find . -type f -name '*.c' -print | xargs touch

They each have their own limitations.

  - Logan
--
"In order to be prepared to hope in what does not deceive,
 we must first lose hope in everything that deceives."

                                          Georges Bernanos