shell 编程之流程控制 for 循环、while 循环和 until 循环 for var in item1 item2 ... itemN do command1 command2 ... commandN done 1. 2. 3. 4. 5. 6. 7. for var in item1 item2 ... itemN; do command1; command2… done; 1....
In this example, we’ve created a ‘for’ loop that acts as a ‘foreach’ loop. The loop iterates over the numbers 1 through 5, echoing each number on a new line. This is a basic way to use the ‘foreach’ loop in Bash, but there’s much more to learn about looping and itera...
Loops are an important building block in a shell script which allows to iterate over a section of code. The bash loop constructs include the for loop, while loop, and until loop. 👉 Sometimes, you may find references to a select loop in bash. It is not part of the bash loop ...
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First, create a file name and execute the following script. Users must note that the ‘*’ is used to read files in the ‘for loop.’ The functioning of the loop is the simple manner by reading each file or folder through the step of the directory and prints with the output in the ...
[student@testvm1 ~]$ script1.sh /home/dboth/bin/script1.sh[student@testvm1 ~]$ The output from this script is the name of the script. The$0parameter is reserved and predefined as the name of the running script and cannot be used for any other purpose. This can be handy inside a...
nano whileloop.sh Then paste in the following: #!/bin/bash n=0 while : do echo Countdown: $n ((n++)) done This will work as a countdown to infinity until you pressCTRL + Cto stop the script. Now that we’ve tested the while loop, we can move on to the for loop. Create a...
The given set of items can be a literal set of objects or anything that Bash can extrapolate to a list. For example, text pulled from a file, the output of another Bash command, or parameters passed via the command line. Converting this loop structure into a Bash script is also trivial...
1. Using your favorite text editor, create a shell script calledsyntax. If you're using Vim, run the following line in the terminal: vim syntax.sh 2. Add the code below to the shell script: # syntax.sh# Declaring functions using the reserved word function# Multilinefunctionf1 {echoHello...
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