清单4-3。parseopts,解析命令行选项 progname=${0##*/} ## Get the name of the script without its path ## Default values verbose=0 filename= ## List of options the program will accept; ## those options that take arguments are followed by a colon optstring=f:v ## The loop calls getop...
In Linux, weuse read command to take the user input. However sometimes, we may need totimeout the user input to automate the script executionin case no one is available. For this, we canuse timeout option of read command. Timeout User Input ### Timeout in 5 seconds if no input rec...
The other numerical operator you should be aware of that you might not be familiar with is the modulus operator (%). The modulus operator returns theremainderafter integer division. In integer division if A / B = C, and A % B = D, then B * C + D = A. Let’s take a look at ...
from the user and add it to our scripts with stanard input and read echo "What is your name? " read name #Here standard output directed to append a file to learnToScirptStandardOutput echo "$name, this will take standard output with append >> and redirect to learnToScriptStandardOutput....
#Let's get some information from the user and add it to our scripts with stanard input and read echo "What is your name? " read name #Here standard output directed to append a file to learnToScirptStandardOutput echo "$name, this will take standard output with append >> and redirect ...
比如while : #same as while truedo operation-1 operation-2 ... operation-ndone或者if conditionthen : # Do nothing and branch aheadelse # Or else ... take-some-actionfi除此之外还可以结合重定向符号使用，将文件内容清空，但是不改变文件权限，如果不存在则会自动创建。1: > ...
#Sample program to take input, encode to base64 and display on terminal #Example by www.debugpoint.com echo "Enter text for encoding to base64:" read input_text output_text=`echo -n $input_text | base64` echo "The Base64 Encoded text is: $output_text" ...
Let’s create a Bash script to take the username as input from the user and compare the name string with the hardcoded name. #!/bin/bash echo "Enter Username" read name while [ "$name" = "sam" ] || [ "$name" = "Sam" ] ...
.sh #!/bin/bash # This is a simple script that you can use for converting text into HTML. # First we take outall newline characters, so that the appending only happens # once, then we replace the newlines. echo "converting 1..." SCRIPT="/home/sandyscripts/script.sed" NAME="...
/bin/bash # your code goes here # Take user Input echo"Enter Two numbers : " reada readb # Input type of operation echo"Enter Choice :" echo"1. Addition" echo"2. Subtraction" echo"3. Multiplication" echo"4. Div