Shell scripts: Exercises

Topic 1:1-100 summation

Non-recursive version:

#!/bin/bashsum=0while [$val-le]dolet sum+=vallet val++doneecho $sumsum =0for i in {1..100}doif [$i = = 1]; Thenbar=${bar}${i}elsebar=${bar}+${i}filet Sum+=idoneecho $bar = $sumsum =0for ((i=1; i<=100; i++)) Dolet sum+= Idoneecho $sum

Operation Result:
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Recursive version:

#!/bin/bashfunction Add () {local count=$1if [$count-eq 1];thenecho 1return filocal tmp= $countlet--tmplocal ret= ' Add $tm P ' let Ret+=countecho $ret}read cret=$ (add $c) echo "$ret"

Operation Result:
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BC Calculation:

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2 string conversion, before and after number conversion, letter case conversion:

#!/bin/bashfunction Str () {While Read strdostr1= ' echo ${str:0:3} ' str2= ' echo ${str:3:3} | tr ' [A-z] ' [A-z] ' str3= ' echo ${ Str:6:3} ' printf '%s%s%s\n "" $str 3 "" $str 2 "" $str 1 "done<file}str

Operation Result:
Before:
753asd456

789dfg123

789fdh456

After the change:

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Find the maximum minimum value of a number for a row in a file:

#!/bin/bashread Nameavg=0max=0min=0cur=0sum=0count=0#cat $name | While read Linewhile read Linedo letcur= $lineif [$count-eq 0];then max= $line min= $linefiif [$cur-gt $max];then max=$ Cur fi if [$cur-le $min];then min= $curfilet count++let sum+=curdone< $nameecho "MAX: $max" echo "min: $min" echo " SUM: $sum COUNT: $count "echo" Average: $ ((sum/count)) "

Operation Result:

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Progress bar:

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Fibonacci Sequence:

#!/bin/basharry[0]=1arry[1]=2temp=0sum=0for i in {0..99}do if [$i-gt 0];thenletarry[$i +1]=arry[$i]+arry[$i-1] Fidoneecho ${arry[99]}

Operation Result:
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This article is from the "egg-left" blog, please be sure to keep this source http://memory73.blog.51cto.com/10530560/1790875

Shell scripts: Exercises