压力测试

[root@web02-7 scripts]# time for i in $(seq 11111);do count=${#chars};done;

real	0m0.187s
user	0m0.090s
sys	0m0.002s
[root@web02-7 scripts]# time for i in $(seq 11111);do count=`echo ${chars}|wc -L`;done;

real	0m16.653s
user	0m0.284s
sys	0m1.236s
[root@web02-7 scripts]# time for i in $(seq 11111);do count=`echo expr length "${chars}"`;done;

real	0m4.901s
user	0m0.309s
sys	0m1.113s
[root@web02-7 scripts]# time for i in $(seq 11111);do count=`echo "$chars"|awk '{print length($0)}'`;done;

real	0m18.889s
user	0m0.515s
sys	0m1.443s