Bug#443198: bashisms in simple examples

package: fai-doc version: 3.2.1 Hi, the following scripts are executed with /bin/sh but contain code, which doesnt work, when /bin/sh is a link to dash: ./LAST/50-misc:error=0 ; trap error=$((error|1)) ERR ./FAIBASE/10-misc:error=0 ; trap error=$((error|1)) ERR ./FAIBASE/30-interface:error=0 ;

Bug#443198: bashisms in simple examples

./LAST/50-misc:error=0 ; trap error=$((error|1)) ERR ./FAIBASE/10-misc:error=0 ; trap error=$((error|1)) ERR ./FAIBASE/30-interface:error=0 ; trap error=$((error|1)) ERR ./GRUB/10-setup:error=0 ; trap error=$((error|1)) ERR = shell: LAST/50-misc = ./LAST/50-misc: 5: arith: