#!/bin/bash #: Description : print formatted sales report ## Build a long string of equals signs divider=== divider=$divider$divider ## Format strings for printf header="\n %-10s %11s %8s %10s\n" format=" %-10s %11.2f %8d %10.2f\n" ## Width of divider totalwidth=44 ## Pri...
/bin/bash# ROS Melodic Installation Scriptsudo -s# Setup your sources.listsh -c'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'# Set up your keysapt-key adv --keyserver'h...
Python 风格 for in(常用)for variable in value_list do statements done value_list直接给出具体的值:1 2 3 4 5,"john" "jack" "tom" 给出一个取值范围(只支持数字和字母):{1..5},{a..f} 使用命令的执行结果:$(ls) 使用Shell 通配符:*.sh 使用特殊变量:$@(如果省略 value_list 的话相当于...
eval 'for val in "${'$arrItem'[@]}";do echo "$val";done' done Output: $ bash for_list7.sh Example-8: Using pattern to read the list of strings Create a new bash file named for_list8.sh with the following code. Here, ‘/, /’ pattern is used to split the string values ...
In a POSIX shell the commands in a function are executed in the current shell context. Bash provides a bit more flexibility where any compound command can be used for a function definition. The syntax of a POSIX shell function is fn_name () compound-command [ redirections ], and an ...
How to sort the elements of an Array in a shell script? You can easily implement a Bubble sort algorithm with a bash function to sort an indexed array (list). This sorting algorithm is called a comparison sort. It iterates over each item of an array using a bash for loop and until ...
Variable names with a dollar sign can also be used inside other strings in order to insert the value of the variable into the string: echo"I went to school in$the_empire_state." ## I went to school in New York. When writing a Bash script, the script gives you a few variables for...
Some useful BASH for loop examples has been mentioned in this article. Syntax of for loop: # loop through a list for value in list do commands done # loop specified values for value in file1 file2 file3 do commands done # loop through strings resulting from a command for value in $(...
Let’s look at a simple example of a ‘for’ loop acting as a ‘foreach’ loop: forfruitinApple Banana Cherry;doecho"I love$fruit";done# Output:# I love Apple# I love Banana# I love Cherry Bash Copy In this example, the ‘for’ loop iterates over the list of fruits (Apple, ...
In the following descriptions, ^X means control-X. ESC stands for the ESCAPE key; for example ESC-v means the two character sequence "ESCAPE", then "v". h or H Help: display a summary of these commands. If you forget all the other commands, remember this one. ...