if((i%2==1)); then patern="Update" else patern="Read" fi
case $1 in "-h") if [ $# -lt 2 ] then helpInfo else errorUse $@ fi ;; "-d") if [ $# -lt 2 ] then noDirectory elif [ $# -gt 2 ] then errorUse $@ else DIR=$2 fi ;; *) errorUse $@ ;; esac
for i in `seq 10` do ... done
------------------->$ seq 2 1 2
------------------->$ seq 1 3 1 2 3
------------------->$ seq 1 2 5 1 3 5
------------------->$ for i in {1..3}; do echo "$i"; done 1 2 3