07-13-2010
sed is not keen at doing arithmetic evaluation.
![Frown Smilie](https://www.unix.com/images/smilies/frown.gif)
You should need first to evaluate length though an *sh script, then pass line to sed, but then you loose sed's benefit.
using awk from the beginning, may be more obvious
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LEARN ABOUT NETBSD
rcs2log
RCS2LOG(1) BSD General Commands Manual RCS2LOG(1)
NAME
rcs2log -- RCS to ChangeLog generator
SYNOPSIS
rcs2log [-c changelog] [-h hostname] [-i indent] [-l length] [-R] [-r option] [-t tabwidth] [-u login<TAB>fullname<TAB>mailaddr] [-v]
[--help] [--version] [file ...]
DESCRIPTION
The rcs2log utility generates a change log prefix from RCS files (perhaps in the CVS repository) and the ChangeLog (if any).
The options are as follows:
-c changelog
Output a change log prefix to changelog (default ChangeLog).
-h hostname
Use hostname in change log entries (default current host).
-i indent
Indent change log lines by indent spaces (default 8).
-l length
Try to limit log lines to length characters (default 79).
-R If no file(s) are given and RCS is used, recurse through working directory.
-r option
Pass option to subsidiary log command.
-t tabwidth
Tab stops are every tabwidth characters (default 8).
-u login<TAB>fullname<TAB>mailaddr
Assume login has fullname and mailaddr.
-v Append RCS revision to file names in log lines.
--help Output help.
--version
Output version number.
SEE ALSO
rcs(1), rcsintro(1), rlog(1), rcsfile(5)
AUTHORS
Paul Eggert <eggert@twinsun.com>
BUGS
Report bugs to <bug-gnu-emacs@gnu.org>.
BSD
February 15, 2003 BSD