A 'for loop' is a bash programming language statement which allows code to be repeatedly executed. A for loop is classified as an iteration statement i.e. it is the repetition of a process within a bash script.
Example 4: Using Command Substitution #!/bin/zshforuserin$(cut-d:-f1/etc/passwd)doecho"User:$user"done for user in $(cut -d: -f1 /etc/passwd): The loop iterates over all usernames in the /etc/passwd file. Example 5: C-style for Loop ...
A 'for loop' is a bash programming language statement which allows code to be repeatedly executed. A for loop is classified as an iteration statement i.e. it is the repetition of a process within a bash script. Tutorial details For example, you can run UNIX command or task 5 times or ...
Now let's look at standard Bash for Loop over Strings. For instance, in the below example, the loop will repeat each item in the list of strings and variable element fixed to the current item. for element in Gold Silver Diamond Platinum do echo "Element: $element" Done Over a Number ...
For example, define an array and loop through the elements with: #!/bin/bash # For loop with array array=(1 2 3 4 5) for i in ${array[@]} do echo "Element $i" doneCopy The output prints each element stored in the array from first to last. ...
Then we need to run below bash for loop fromi=1 to i<=3to convert the rows into columns. [root@localhost ~]#for ((i=1;i<=3;i++)); do cut -d, -f "$i" testfile.txt | paste -sd, ; done | column -t -s,Hi This hello you is world there CYBERITHUB example ...
This type of for loop is characterized by counting. The range is specified by a beginning (#1) and ending number (#5). The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to display welcome message 5 times wit...
Break and continue, for loop operation For example if you want to scan a huge number of file and find the first empty file, you can use following bash for loop. for i in $( ls /tmp/log*) do echo “Name is $i “ if [ -s $i ] ## file not empty ...
syntax: until expression do commands #body of the loop done 在上面的 bash until 语法中: where until, do, done 是关键字 表达式 任何条件表达式 Bash until Example 5. 监控日志文件 此示例监视日志文件的大小,一旦日志文件大小达到 2000 字节,它将获取该日志文件的副本。
Bash For 循环 – 第一种方法 当在进入 bash 循环之前知道迭代次数时,通常使用 for 循环。Bash 支持两种 for 循环。bash for 循环的第一种形式是: forvarnameinlistdocommands ##Bodyofthe loop done 在上面的语法中: for、in、do 和 done 是关键字 ...