On Tue, Jul 26, 2016 at 8:29 PM, <dtr@home.homenet> wrote:
> Configuration Information [Automatically generated, do not change]: > Machine: x86_64 > OS: linux-gnu > Compiler: x86_64-pc-linux-gnu-gcc > Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' > -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' > -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL > -DHAVE_CONFIG_H -I. -I./include -I. -I./include -I./lib > -DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin' > -DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin' > -DSYS_BASHRC='/etc/bash/bashrc' -DSYS_BASH_LOGOUT='/etc/bash/bash_logout' > -DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -march=corei7-avx -O2 > -pipe -fomit-frame-pointer > uname output: Linux home 4.0.5-gentoo-i5 #11 SMP PREEMPT Thu Dec 31 > 00:13:56 MSK 2015 x86_64 Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz > GenuineIntel GNU/Linux > Machine Type: x86_64-pc-linux-gnu > > Bash Version: 4.3 > Patch Level: 39 > Release Status: release > > Description: > Unlike usual variables, that have been assigned an empty value, > arrays are treated by test -v as if they weren’t assigned anything. > > Repeat-By: > > $ unset nothing; declare -p nothing; [ -v nothing ]; echo $? > bash: declare: nothing: not found > 1 > > $ unset var; var= ; declare -p var; [ -v var ]; echo $? > declare -- var="" > 0 > > $ unset arr; arr=(); declare -p arr; [ -v arr ]; echo $? > declare -a arr='()' > 1 > > This has been reported and discussed several times. bash consider an array as unset until at least one of its element has been assigned a value.
