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if[[$#-eq 1]] then a=$1 fi shell程序里面这个是什么意思呀

$#表示脚本参数的个数,$1表示第一个参数.如果运行脚本时带有且只带有1个参数,那么将变量a赋值为这个参数的值.比如一个shell脚本叫test.sh运行./test.sh123那么变量a就被赋值为123

shell 中的下面这句话是什么意思 if [ "${1:-NULL}" = "A" ]; then fi

这种写法在shell里叫参数替换$1是行参变量,也就是脚本执行时的第一个参数.${1:-NULL}意思是当$1为空时,自动将NULL替换成$1所要带入的变量值.以下引用ABS里的一段话${parameter:-default}--如果变量p

Fi(X)是一个不超过n-2次的多项式(i=1,2...N)求证对于任意n个数a1,a2.an有行列式

设Fi(x)=bi0+bi1x+bi2x^2+...+bi,n-2x^(n-2),i=1,2,...,n令n阶矩阵B=b10b11...b1,n-20b20b21...b2,n-20......bn0bn1...bn,n-20A=11...

I was proud of the fact --1-- she had never,in her thirty-fi

这个从句是同位语从句,而同位语从句不能用which引导.

一篇简单的英语填词Last Saturday morning Mr Chen left 1 early to go fi

1:home2:sat3:caught4:laugh5:nothing6:idea7:shop8:a9:came10:wife

会计英语fanyibang wo fan yi yi xia!1.An income statement is a fi

1.Anincomestatementisafinancialstatementshowingtheresultsofoperationsforabusinessbymatchingrevenueandrelatedexpensesfora

英语选择题!1):I had to ___three forms to get my new passport.A:fi

1.Afillin填写/填充2.Aputaside拨出3.Dtakeanactivepartinsth积极参加某事4.Cturnmuchwarmer变得更加暖和地多5.Aalthough尽管/虽然6.Cnot...anymore不再7.As

1、Yesterday we went to the park instead of ___ to see the fi

1.Binsteadofdoingsth;of是介词,所以go用ing形式.昨晚我们没去看电影,去逛公园了.2.Cdeath名词,去世.表示死去的一种状态.MrsKelly死后,父亲和Robert一起生活.3.Bnoanymore=nota

1: No one knows how long it will last. 2: were curious to fi

第一句中howlong引导的句子(howlongitwilllast)整个做knows的宾语,并非仅疑问词howlong在句中是作know的宾语.第二句中whathadhappened这个从句做findout的宾语,what是从句中happ

(1)He s___ that we should take exercise every day to keep fi

said;mess(混乱);explanation;unless(unlessif除非的意思);sincerely;precious;forbidden(禁止的);argument;

Lucy won the race. She got to the finish line__. A No.1 B fi

BShegottothefinishlinefirst.她先到达的终点线.first前不要加the.再问:为什么?再答:如果加the的话,可以这样说:Shewasthefirsttogettothefinishline.再问:那有什么区别?

英语翻译1 The leaders failed to reach a peace agreement.2 The fi

1领导们没能达成和平协议.2使用武力没能将反叛武装赶出这座城市.3他在那个字下画了一条细线.4举旗的那一组人走在游行队伍的前10米.5历史上有许多人为争取自由而牺牲.6他说书的前面是最佳的部分.

几个英语问题1、Though he was a little boy,he was brave enough to fi

1,可以把little加在boy前面,只是不能加a2.conflict是冲突beinconflictwithwar战争beatwarwithbarrier障碍quarrel争吵quarrelwith

英语翻译请大哥们帮我翻译几个句子1:Other findings were that search engines fi

自己翻译的.可能有的地方用词不好.1.其余的调查结果表明,搜索引擎仍然比实体图书馆或网上图书馆更适合大学生的生活方式;大学生仍然在使用图书馆,但他们用的越来越少(读的书也越来越少),因为他们最初就是用网上的搜索引擎;对于大学生,图书仍然是图

服装英语高手请进请帮忙翻译以下为中文,(1)Tiny fit,Tag-free for added comfort,fi

(1)瘦小版型,无商标而更舒适,贴身剪裁,配套服饰另外单卖(2)二细节:a.7英寸内接缝b.裤腰位于腰部下方c.裤腿位于关节上方d.裤鼻,前裆拉链开口,钩扣锁眼1.裤腿位于关节上方2.裤鼻,前裆拉链开口,钩扣锁眼

用完成时态改写句子(1) Kate bought a new bike two years ago.(4) The fi

Katehashadanewbikefortwoyears.再问:还有问题呢

初中英语改错句1 What time will he be back?In three days.2 What a fi

1.Howsoonwillhebeback?(多久以后用soon)2.Whatafinedayitis!(好天气用day)3.Howfastheruns!(或者可以用ran)4.TheweatherinBeijingisnotashotas