Modern shell #scripting is weird. :P #programming #bash #linux
#!/usr/bin/env bash
function parse_options () {
declare -n result="$1"
shift 1
result['verbosity']='4'
result['memory']='24G'
result['volumes']=''
result['device']='/dev/st0'
result['write-rate']='250M'
local opt
local OPTARG
while getopts 'vm:n:i:' opt
do
case $opt in
v)
result['verbosity']=6
;;
m)
result['memory']="$OPTARG"
;;
n)
result['volumes']="$OPTARG"
;;
i)
result['device']="$OPTARG"
;;
r)
result['write-rate']="$OPTARG"
;;
esac
done
if [[ -z "${result['volumes']}" ]]; then
echo "-i VOLUMES is required"
exit 1
fi
return 0
}
declare -A CONFIG
parse_options CONFIG "$@" || exit 1
exec mbuffer \
-v "${CONFIG['verbosity']}" \
-m "${CONFIG['memory']}" \
-n "${CONFIG['volumes']}" \
-p 30 \
-s 65536 \
-A 'sh /usr/local/bin/tape_wait.sh' \
-f \
-R "${CONFIG['write-rate']}" \
-i "${CONFIG['device']}"like this
reshared this
"Google Maps Walkway Confusion"
Google Maps said to take the pedestrian bridge, but the bridge doesn't connect with the roadway it says to take next.
#googlemaps #map #mywork #photog #photography #ridemap
in reply to Neil E. Hodges
using Lagrange, with no means of comparison. Does the job as far as I'm concerned.
Neil E. Hodges likes this.
like this
Stephane L. Rolland-Brabant ⁂
in reply to Neil E. Hodges • • •thanks, I am not sure I ever used declare -n , but that is pretty nice to know. I have to experiment with it
Do you have any advise/warning about it? Seems like a huge step to introduce something resembling references into #bash
headrift
in reply to Neil E. Hodges • • •😀🚲
in reply to Neil E. Hodges • • •Greg A. Woods (another old account)
in reply to Neil E. Hodges • • •Buffers? I see no buffers. It's a relatively trivial little script to translate one command-line API into another. I would use
typesetinstead ofdeclareto make it portable to Korn Shell, and get rid of the unnecessarylocal OPTARG. I would get rid of the unnecessary local-reference trick withresult-- it is not a sin to modify a well named global variable in a shell script. It could easily be translated into entirely POSIX-compatible syntax by using multiple global variables.As for using another language, well that would be both silly, and far more complex. The shell is always already there and quite capable.
Neil E. Hodges likes this.