$ hello_world="value" # Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 或者,在bash4.3+上: $ hello_world="value" $ var="world" # Declare a nameref. $ declare -...
echo "numberTwelve variable is greater than 12" else echo "neither of the statemens matched" fi 输出如下: [zexcon@fedora ~]$ ./learnToScript.sh numberTwelve variable is equal to 12 你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is...
‘item2’, and ‘item3’. We then use a ‘for’ loop to iterate through each element in the array. The"${array[@]}"syntax is used to access all elements in the array. For each iteration, the current element’s value is stored in theivariable, which we then print out using theec...
/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
[zexcon@fedora~]$./learnToScript.shnumberTwelvevariableisequalto12 1. 2. 你所看到的是 if 语句的第一行,它在检查变量的值是否真的等于 12。如果是的话,语句就会停止,并发出 numberTwelve is equal to 12 的回显,然后在 fi 之后继续执行你的脚本。如果变量大于 12 的话,就会执行 elif 语句,并在 fi...
在使用 break 时需要注意的是,它与 return 及 exit 是不同的:*break 是结束 loop* return 是结束function* exit 是结束 script/shell 而continue 则与 break 相反:强迫进入下一次循环动作。若你理解不来的话,那你可简单的看成:在 continue 到done之间的句子略过而返回循环顶端...与 break 相同的是:continue...
# Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 1. 2. 3. 4. 5. 6. 7. 8. 9. 或者,在bash4.3+上:
Theset -eis used to exit the code in case of a command error, then the script gets getting filename as user input. Theread -rcommand reads the file and stores the strings to thelinevariable. Next, theecho $linedisplays the lines to the standard output. Lastly, thefilenamevariable is ...
Example bash script for the for loop: #!/bin/bash for((num=0; num<5; num=num+1)) do echo "num:"$num done Here, incrementing the counter was done with num=num+1. The script is written using let like this: #!/bin/bash for((num=0; num<5;)) do echo "num:"$num let num...
This problem involves writing a Bash script that defines a function named "add()" to calculate and return the sum of two given numbers using a recursive approach. The function should handle the addition by incrementing or decrementing the first number until the second number is exhausted, effect...