Robert Elz wrote in <14296.1494903...@andromeda.noi.kre.to>:
| Date: Mon, 15 May 2017 18:36:58 +0200
| From: Steffen Nurpmeso <stef...@sdaoden.eu>
| Message-ID: <20170515163658.b7ljs%stef...@sdaoden.eu>
|
|| Is it at all possible to store the parameter stack in a variable
|| "x" in order to restore it exactly "as-is", in the shell?
|
|Yes, it is, you just need to think in a slightly different way when
...
|What you need first is a function which quotes a string, used like
| result=$(quote "$string")
|in a way that you can later do
| eval "string=${result}"
|and get back the original string - whatever it contains.
...
|quote() {
...
|}
...
--End of <14296.1494903...@andromeda.noi.kre.to>
Robert Elz wrote in <8267.1494911...@andromeda.noi.kre.to>:
...
|And of course, you could also write it as a sub-shell function - as \
|this func
|has no intended effects on the calling shell, so doing it that way avoids
|problems of namespace pollution, or any requirement that IFS or the options
|be restored. To do that, instead of
|
|quote() {
| # code...
|}
|
|write
|
|quote() (
| # code, but not bothering with any save/restore and using any var names
|)
...
For compatibilities sake i want to add that the subshell version
is necessary on Sun OS 5.9, as /usr/xpg4/bin/sh does not support
set +o "in a format that is suitable for reinput":
#?0|unstable9s:sdaoden$ /usr/xpg4/bin/sh -c 'i=`set +o`; echo $i'
Current option settings allexport off bgnice off
So the only portable in-shell code seems to be
kre__quote() (
case "$1" in
*\'*) ;;
*) printf "'%s'" "$1"; return 0;;
esac
__A__="$1" __S__= __E__=
while case "$__A__" in
\'*) __A__=${__A__#?}; __S__="${__S__}\\\\'";;
*\') __A__=${__A__%?}; __E__="${__E__}\\\\'";;
'') printf "${__S__}${__E__}"; exit 0;;
*) false;;
esac
do
continue
done
IFS=\'
set -f
set -- $__A__
_result_="${1}"
shift
for __A__
do
_result_="${_result_}'\\''${__A__}"
done
printf "${__S__}'%s'${__E__}" "${_result_}"
exit 0
)
kre_quote() {
j=
for i
do
[ -n "$j" ] && printf ' '
j=' '
kre__quote "$i"
done
}
with the precaution that printf is not a built-in sometimes.
|kre
--End of <8267.1494911...@andromeda.noi.kre.to>
With many thanks for your efforts, once again.
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
