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shell 习题[@more@]1.对两个数分别求和、差、积、商、余，两个数由脚本参数传递[root@ shell]# cat 1.sh #!/bin/bash#var2=$1#var2=$2read -p "Enter 1st number: " var1read -p "Enter 2se number: " var2#if expr "$1" + 0 &>/dev/nullif grep -qE '^[0-9]+$' <<< $var1 &>/dev/nullthen #if expr "$2" + 0 &>/dev/null if grep -qE '^[0-9]+$' <<< $var2 &>/dev/null then echo $var1 + $var2 = $[var1+v