现在的位置: 首页 > Linux > shell脚本 > 正文
shell下数字和字符串比较操作命令
2013年01月08日 shell脚本 ⁄ 共 1070字 评论数 8 ⁄ 被围观 4,466 views+

二元比较操作符,比较变量或者比较数字.注意数字与字符串的区别.

整数比较 

-eq        等于,如:if [ "$a" -eq "$b" ]
-ne        不等于,如:if [ "$a" -ne "$b" ]
-gt        大于,如:if [ "$a" -gt "$b" ]
-ge        大于等于,如:if [ "$a" -ge "$b" ]
-lt        小于,如:if [ "$a" -lt "$b" ]
-le        小于等于,如:if [ "$a" -le "$b" ]
<        小于(需要双括号),如:(("$a" < "$b"))
<=        小于等于(需要双括号),如:(("$a" <= "$b"))
>        大于(需要双括号),如:(("$a" > "$b"))
>=        大于等于(需要双括号),如:(("$a" >= "$b"))

字符串比较 
=        等于,如:if [ "$a" = "$b" ]
==        等于,如:if [ "$a" == "$b" ],与=等价
注意:==的功能在[[]]和[]中的行为是不同的,如下:
1 [[ $a == z* ]]    # 如果$a以"z"开头(模式匹配)那么将为true
2 [[ $a == "z*" ]]  # 如果$a等于z*(字符匹配),那么结果为true
3  [ $a == z* ]      # File globbing 和word splitting将会发生
4 [ "$a" == "z*" ]  # 如果$a等于z*(字符匹配),那么结果为true
一点解释,关于File globbing是一种关于文件的速记法,比如"*.c"就是,再如~也是.

但是file globbing并不是严格的正则表达式,虽然绝大多数情况下结构比较像.

!=        不等于,如:if [ "$a" != "$b" ]
这个操作符将在[[]]结构中使用模式匹配.

<        小于,在ASCII字母顺序下.如:
if [[ "$a" < "$b" ]]
if [ "$a" /< "$b" ]
注意:在[]结构中"<"需要被转义.

>        大于,在ASCII字母顺序下.如:
if [[ "$a" > "$b" ]]
if [ "$a" /> "$b" ]
注意:在[]结构中">"需要被转义.
具体参考Example 26-11来查看这个操作符应用的例子.

-z        字符串为"null".就是长度为0.

-n        字符串不为"null"
注意:
使用-n在[]结构中测试必须要用""把变量引起来.使用一个未被""的字符串来使用! -z
或者就是未用""引用的字符串本身,放到[]结构中。虽然一般情况下可
以工作,但这是不安全的.习惯于使用""来测试字符串是一种好习惯.

目前有 8 条留言 其中:访客:8 条, 博主:0 条

  1. Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  2. DAN ANTON: BACKLINKSVAULT and BrandlinksRank : 2017年05月20日14:58:43  -48楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  3. Lise Winicki : 2017年05月20日14:59:14  -47楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  4. DAN ANTON: BACKLINKSVAULT and BrandlinksRank : 2017年05月20日14:59:29  -46楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  5. Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  6. Arie Abekasis Diditan Financial : 2017年05月20日15:01:22  -44楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  7. Mountain Business Center LLC Rebecca Bextel : 2017年05月20日15:01:37  -43楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

  8. Elite Client Services : 2017年05月20日15:01:52  -42楼 @回复 回复

    Executive pleading poverty after $44M judgment Symons and family ordered to pay $34.2 million in fraud case Alan Symons In the United States Court of Appeals Arie Abekasis Diditan Financial ARIE ABEKASIS DIDITAN FINANCIAL DIDITAN GROUP ARIE ABEKASIS OF DIDITAN Richard Ellenbogen – Beverly Hills Body Richard Ellenbogen – Beverly Hills Body – Babak Dadvand Beverly Hills Body Plastic Surgeons – Richard Ellenbogen MD Richard Ellenbogen And Babak Dadvand Plastic Surgeons Of Beverly Hills Richard Ellenbogen Plastic Surgeon And Babak Dadvand Richard Ellenbogen Md Plastic Surgery Rhinoplasty Nose Job Richard Ellenbogen Beverly Hills Body Cosmetic Plastic And Reconstructive Surgeon Richard Ellenbogen Plastic Surgeon – Babak Dadvand Richard Ellenbogen Beverly Hills Body And Babak Dadvand Richard Ellenbogen – Beverly Hills Body BRIAN WILLIS Brockstar DAN ANTON: BACKLINKSVAULT and BrandlinksRank dan anton Kotton Grammer OMG Machines SCAM Don Tigert granger whitelaw Richard Cosentino John Schmutzer Exotic Images LLC CMC Choppers Jim Haszinger COSENTINO N Ripoff Reports Complaints Reviews Scams Lawsuits and Frauds Reported Jim Haszinger KaonSoftwares Kaon Softwares Emergency Vehicle Lights Light bars Sirens LED Outfitters Lise Winicki LuxSauna Auto Connection Manassas Complaint Review: Poggi Michael Michael Poggi Poggi’s Animal House Complaint Review: Michael Poggi Poggisanimalhouse 9547089441 Complaint Review: Mountain Business Center LLC Rebecca Bextel SwiftUnlocks Elite Client Services Complaint Review: Naushad Noordin Velani Complaint Review: Trey Knight Trey Knight trey night Haskel Grant Knight Haskel G Knight FHTM LIMU Danger Trey Knight Uses fake social security numbers Trey Knight Atlantic Beach, Florida Trey Knight is a Scammer LA Laser Center Gerardo Cornejo Velez 多伦多中医吴冠英 Conslines.com

给我留言

留言无头像?


×