Shell calculation string length method and speed comparison

Tag: Shell calculates string length

chars= ' seq-s '; echo $chars 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32  33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 The all-in-all-over-the-------Bayi------------------------100echo ${#chars}291echo $chars | wc-m292 echo $ (expr length "$chars") 291

Time for I in $ (seq 11111);d o count=${#chars};d one;

Real 0m0.516s

User 0m0.499s

SYS 0m0.017s

[[Email protected] shell]# time for I in $ (seq 11111);d o count= ' echo ${chars} | Wc-m ';d one;

Real 0m15.773s

User 0m0.473s

SYS 0m1.412s

Time for I in $ (seq 11111);d o count= ' echo exprlength "${chars}" ';d one;

Real 0m5.671s

User 0m0.114s

SYS 0m1.856s

Conclusion: Try to use the built-in function

This article is from the "track to record work learning" blog, so be sure to keep this source http://stephenliu.blog.51cto.com/6470474/1637908

Shell calculation string length method and speed comparison