This is an introduction article in theseries of bash scriptingwhere important topics like file extensions, shebang, and comments are covered to make you write your first shell script. In the Introduction section, we have provided the link to all the articles in this series. Bash scripting is ...
(1)bash -x script.sh or sh -x script.sh (2)使用set -x和set +x对脚本进行部分调试。例如: #!/bin/bash #filename:debug.sh for i in {1..6}; do set -x echo $i set +x done echo "script executed" [cairui@cai shell]$ sh debug.sh + echo 1 1 + set +x + echo 2 2 + s...
# 位置参数调用, 假设在终端输入 bash bash_tutorial.sh 1 2 3 echo "current script name: \$0 $0" # 当前脚本名称 echo "incoming parameters: \$1 $1 \$2 $2 \$3 $3" # 访问传入的参数 echo "the number of parameters: \$# $#" # 传入的参数数量 echo "all parameters: \$@ $@" # ...
Here we are using the "uptime" and the "date’ commands for the options. #!/bin/bash echo "choose an option:" echo "1 - system uptime" echo "2 - date and time" echo read choice case $choice in 1) uptime;; 2) date;; *) invalid argument esac echo echo "* end of script *"...
When writing a script, you typically temporarily store a value to a variable, which you can print with the echo command. This function can be helpful when checking the value of a variable to debug a shell script. Run the commands below to set the number variable’s value to 10 and print...
echo"Hello World!" 当我们必须将多个命令组合在一起时,将脚本组合在一起就非常有用。 4. Bash 变量 和其他编程一样,Bash也有变量。但是,变量在 bash 中不是数据类型,变量在 bash 中可以是容器编号和字符。 给变量赋值,使用=号赋值: 代码语言:javascript ...
The HereDoc itself contains any number of lines with strings, variables, commands, and other inputs.Bash HereDoc 语法[命令] <<[-] '分隔符标记' Line 1 Line 2 ... 分隔符标记 命令是可选的。适用于任何接受重定向的命令。 << 是用于将 HereDoc 转发到 COMMAND 的重定向运算符。 - 是制表符抑制...
/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# (...
# The script is:echo() {builtinecho-n `date +"[%m-%d %H:%M:%S]"`": "builtinecho$1}echo"Welcome to OfficialAccounts"# The result is:[09-29 21:56:10] : Welcome to Official Accounts 从上面例子可以看出,echo输出会附带上时间信息。
A bash function is a set of commands that can be reused numerous times throughout a bash script. Create a new file:nano function.shThen, paste in the following code – it creates a simple Hello World function.#!/bin/bash hello () { echo 'Hello World!' } hello...