On Tuesday 15 April 2008 20:32, Cristian Ionescu-Idbohrn wrote:
> On Tue, 15 Apr 2008, James Simmons wrote:
>
> > This fails.
> >
> > runlevel=$(cat /proc/1/cmdline 2> /dev/null)
> > echo $runlevel # init [2]
> > runlevel=${runlevel#* [}
> >
> > echo "runlevel '$runlevel'" # Should be runlevel '2]'
> > # we get runlevel 'init [2]'
>
> Hmm...
>
> But:
>
> # runlevel=${runlevel#* \[}
> # echo $runlevel
> 2]
Well, we are trying to emulate bash here, and so far it does not fully work:
# ./busybox ash -c "runlevel='init [2]';"' echo $runlevel; echo ${runlevel#* [}'
init [2]
init [2]
# bash -c "runlevel='init [2]';"' echo $runlevel; echo ${runlevel#* [}'
init [2]
2]
# ./busybox ash -c "runlevel='init [2]';"' echo $runlevel; echo ${runlevel#*
\[}'
init [2]
2]
# bash -c "runlevel='init [2]';"' echo $runlevel; echo ${runlevel#* \[}'
init [2]
2]
The reason seems to be that fnmatch() doesn't threat that [ as a literal:
# ./busybox ash -c "runlevel='init [2]';"' echo $runlevel; echo ${runlevel#* [}'
init [2]
ash: fnmatch('* [','',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','i',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','in',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','ini',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','init',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','init ',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','init [',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','init [2',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* [','init [2]',0)=1 (FNM_NOMATCH=1)
init [2]
# ./busybox ash -c "runlevel='init [2]';"' echo $runlevel; echo ${runlevel#*
\[}'
init [2]
ash: fnmatch('* \[','',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* \[','i',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* \[','in',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* \[','ini',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* \[','init',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* \[','init ',0)=1 (FNM_NOMATCH=1)
ash: fnmatch('* \[','init [',0)=0 (FNM_NOMATCH=1)
2]
--
vda
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