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The summation of 1...100

Non-recursive:   #!/bin/bash read num count=1 sum=0 val= ""  ret= ""  while  [  $count  -le  $num  ] do    if [  $count  -eq   $num  ];then        val= $count     else         val=${count} ' + '     fi     let sum+=count    let count++    ret=${ret}${val}  done echo ${ret} ' = ' $sum   recursion:  #!/bin/bash read num function add () {      local val=$1     local count=0      local sum=0     local num= $val       if [  $val  -eq 1 ];then          Echo 1         return     fi     arr= $count 1+$ val     let val--     let count=$ ( add $ val )      let sum= $count + $num      echo  $sum  }  ret=$ (add  $num)   echo  $ret

Results:

[Email protected] test6_19]$./add.sh

100

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+74+75+76+ 77+78+79+80+81+82+83+84+85+86+87+88+89+90+91+92+93+94+95+96+97+98+99+100=5050

Maximum minimum value of the number in a file

#!/bin/bash Read Namemax=0min=0count=0while read Linedo if [$count-eq 1];then min= $line fi ((count++) If [$max-lt $line];then max= $line fi if [$min-gt $line];then min= $line fi done < $n Ameecho "Max:" $max "min:" $min

The Fibonacci sequence sums

Non-recursive #!/bin/bashread numfib_val[0]=1fib_val[1]=1count=0function fib () {   local val =$1   while [  $count  -lt  $val  ]   do        let fib_val[${count}+2]=${fib_val[${count}+1]}+${fib_val[$count]}        let count++   done}fib  $numecho  ${fib_val[$count]} Recursion: #!/bin/bashread numfunction fib () {   local val=$1   local  num1=0   local num2=0   if [  $val  -eq 0 -o   $val  -eq 1 ];then       echo 1        return   fi   let val--   num1=$ (  fib  $val  )    let val--   num2=$ ( fib  $val  )    let sum= $num 1+ $num 2   echo  $sum} 

Results:

[Email protected] test6_19]$./fib.sh

1

1

[Email protected] test6_19]$./fib.sh

2

2

[Email protected] test6_19]$./fib.sh

11

144

Application of String interception

#!/bin/bashread namestr1= "" str2= "" str3= "" str= "" while read Linedo str1=$ (echo $line |cut-c 1-3) str2=$ (Echo $line |cut -C 4-6 |tr ' [A-z] ' [A-z] ') str3=$ (echo $line |cut-c 7-9) str= "${str3}" "${str2}" "${str1}" echo $str done < $na Me >file_bak

Results:

[email protected] test6_19]$ cat File1

123abc789

456def789

364rgy532

278bsy682

[Email protected] test6_19]$ vim string.sh

[Email protected] test6_19]$./string.sh

File1

[email protected] test6_19]$ cat File_bak

789abc123

789def456

532rgy364

682bsy278

This article is from the "Small Town Moss" blog, please make sure to keep this source http://fengbaoli.blog.51cto.com/10538178/1790844

Shell Script Application Applet