Bash Programming: Shell Exercises

Bash Programming: Exercises

1. Write a script: If a path does not exist, it is created as a directory, otherwise it is present, and the content type is displayed

#!/bin/bash#baseurl=/var/tmp/testdirif [-e $baseurl]; Thenecho "file is no exists." Elsemkdir-p $baseurlfile $baseurlfi

2. Write a script to complete the following functions; Determine the given two values, whichever is smaller; method of a given number: script parameter, command interaction

#!/bin/bash#if [$#-lt 1]; Thenecho "Plz Enter and digit" Exit 1fiif [$1-GT]; Thenecho "max;$1 min:$2" Elseecho "max:$2 min:$1" fi

3. Ask for the sum of all odd numbers within 100 (at least 3 methods)

(1) #!/bin/bash#declare-i sum=0for i in $ (SEQ 1 2 100); dosum+= $idoneecho "sum: $sum." (2) #!/bin/bash#declare-i sum=0for i in {1..100}; doif [$[$i%2]-eq 1]; thensum=$ (($sum + $i)) Fidoneecho "sum: $sum" (3) #!/bin/bash#declare-i sum=0he () {For I in $ (SEQ 1 2); dosum=$ (($sum + $i )) Done}heecho "sum: $sum."

4. Write a script to implement the following functions:

(1) Pass two text file path to script;

(2) Show the number of blank lines in two files and their blank lines;

(3) Show the total number of files in two files and their total number of rows;

#!/bin/bash# #if [$#-lt 1]; then# echo "Plz enter" and "Opt." # Exit 1#fispace1=$ (grep "^$"/root/file |wc-l) space2=$ (grep "^$"/root/file1 |wc-l) line1=$ (cat/root/file |wc-l) line2= $ (Cat/root/file1 |wc-l) if [$space 1-gt $space 2]; Thenecho "Kongduode is/root/file: $space 1 Lines" Elseecho "Kongduode is/root/file1: $space 2 Lines" Fiif [$line 1-gt $line 2]; Thenecho "Zonghangduo is/root/file: $line 1 Lines" Elseecho "Zonghangduo is/root/file1: $line 2 Lines" fi

5. Write a script

(1) Prompt the user to enter a string;

(2) Judgment:

If the input is quit, exit the script;

Otherwise, the string content of its input is displayed;

#!/bin/bash#while true; Doread-p "Plz Enter character:"-T ten char[$char = = "Quit"]&& Breakecho "character is A: $char" Done

6. Write a script to print the 2^n table; n equals a user-entered value

#!/bin/bash#read-p "Plz Enter a num:"-T ten numdeclare-i i=0while [$i-le $num];d olet i++echo-n-E "2^ $i =$[2** $i]" EC Hodone

7. Write a script, write a few functions: function 1, achieve the sum of two values given, function 2, take the greatest common divisor of the given two values, function 3, take the least common multiple of the given two numeric values, and the size of the selected and two numeric values of the function will be provided through interactive input. Note: Really do not know the number of conventions, common multiple, copy of the Chino students homework

#!/bin/bash#if [[$1-eq] "]];thenecho ' plz input the first number ' exit 1fiif [[$2-eq] ']];thenecho ' plz input the SEC  Ond number ' exit 2fifunction Add () {Sum=$[$1+$2]echo "The sum is $sum"}add $2declare-i maxdeclare-i minif [[$1-gt $ ]];thenmax=$1min=$2elif [[$1-lt $]];thenmax=$2min=$1elsemax=$1min=$2fifunction gong () {r=$[$max% $min]temp=$ Mindeclare-i adeclare-i bif [[$r-eq 0]];thenecho "Gongyue is $min" echo "Gongbei is $max" Elsewhile [[$r-ne 0]];d oa= $2b= $rr =$[$a% $b]donegongyue= $bgongbei =$[$1*$2/$b]echo "Gongyue is $gongyue" echo "Gongbei is $gongbei" Fi}gong $

Bash programming: Shell exercises