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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | This file documents rgrep, a recursive, highlighting grep program.
Currently, rgrep is only available on Unix systems. To build it, move to
the src directory for JED and enter: `make rgrep'.
Why use rgrep instead of more traditional Unix tools?
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Unlike grep and egrep, rgrep has the ability to recursively descend
directories. The traditional way of performing this kind of search on Unix
systems utilizes the `find' command in conjunction with `grep'. However,
this results in very poor performance. Consider the tradional approach
where one wants to search the /usr/include directory for the string `FD_SET':
For this, one would use:
% find /usr/include -exec grep -l FD_SET \{\} \; -print
Ignoring the fact that the above expression looks complex, it failed to find
any occurence of FD_SET under the /usr/include directory of my Ultrix
system.
Now, if rgrep is used, one types:
% rgrep -lFr FD_SET /usr/include
which yielded: /usr/include/sys/types.h
The reason that `find' failed is that /usr/include/sys is a symbolic link to
/sys/h. `rgrep' was able to succeed because of the `-F' flag which telles
it to follow links. I looked in the man page for a similar option for
`find' but nothing turned up.
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