wyle@solaris.UUCP (Mitchell Wyle) (07/26/88)
Is there a better way to parse numeric ranges than the following? ------------------------- snip here ------------------------- #!/bin/sh # # parse a range of numbers in the form: # # <range> :== <number> # | <number>,range # | <number>-<number> # | <number>- # # <number>:== <digit><number> # # <digit> :== 0|1|2|3|4|5|6|7|8|9 # # ...to create a list of numbers; e.g. 1,3,8-11 -> 1 3 8 9 10 11 # # input range is in variable $RA ($1 for this example) RA=$1 echo in: $RA R="" RA=`echo $RA | sed 's/,/\ /g'` for tok in $RA ; do if echo $tok | grep -s '\-' ; then t=`echo $tok | sed 's/-/ - /'` set $t i=$1 max=${3:-99} while test $i -le $max ; do R=$R" "$i i=`expr $i + 1` done else R=$R" "$tok fi RA=$R done echo out: $RA ------------------------- snip here ------------------------- Is there a faster way? How does Larry Wall's mailpatch work? Curious minds want to know! -- -Mitchell F. Wyle wyle@ethz.uucp Institut fuer Informatik wyle%ifi.ethz.ch@relay.cs.net ETH Zentrum 8092 Zuerich, Switzerland +41 1 256-5237
lwall@jpl-devvax.JPL.NASA.GOV (Larry Wall) (08/19/88)
In article <469@solaris.UUCP> wyle@solaris.UUCP (Mitchell Wyle) writes:
: Is there a better way to parse numeric ranges than the following?
[sh script to do ranges omitted]
: Is there a faster way? How does Larry Wall's mailpatch work?
:
: Curious minds want to know!
The mailpatch script calls a C program to do the ranges. The patch sender
built into the dist package is written in perl, which groks numbers a bit
better than sh does. One of these days I'll rewrite mailpatch in perl and
delete the C program.
Larry Wall
lwall@jpl-devvax.jpl.nasa.gov