Using the multiple variable assignment technique in Bash scripts can make our code look compact and give us the benefit of better performance, particularly when we want to assign multiple variables by the output of expensive command execution. For example, let’s say we want to assign seven vari...
Bash scripts can benefit from the multiple variable assignment technique, which not only makes the code look compact but also improves performance. This is especially useful when assigning multiple variables based on the output of an expensive command. The read command is a helpful tool in achieving...
2.3. Assign to Variable Notably, however, we can assign the result of the entire expression to another variable: $ y="${x:-default_value}"$echo"$y"default_value Theyvariable is assigned the result of the${x:-default_value}expression which, in this case, expands to thedefault_valuestring...
"$BASH" 获取当前正在运行的bash进程的版本 # As a string. "$BASH_VERSION" # As an array. "${BASH_VERSINFO[@]}" 打开用户首选的文本编辑器 "$EDITOR" "$file" # NOTE: This variable may be empty, set a fallback value. "${EDITOR:-vi}" "$file" 获取当前函数的名称 # Current function....
描述(DESCRIPTION) Bash 是一个与 sh 兼容的命令解释程序,可以执行从标准输入或者文件中读取的 命令。 Bash 也整合了 Korn 和 C Shell (ksh 和 csh) 中的优秀特性。 Bash 的目标是成为遵循 IEEE POSIX Shell and Tools specification (IEEE Working Group ...
bash shellecho ${SHELL} # 显示当前使用的shell cat /etc/shells # 显示当前系统使用的所有shell 命令提示符echo $PS1 # 显示当前命令提示符格式 [\u@\h \W]\$ PS1="\[\e[1;5;41;33m\][\u@\h \W]\\$ \[\e[0m\]" # 修改命令提示符 PS1='\[\e[1;36m\][\u@\h \W]\$ \[\e[...
Shell变量在脚本中跟踪值非常有用,而且一些Shell变量可以控制Shell的行为方式(例如,bash Shell在显示提示符之前会读取PS1变量)。 To assign a value to a shell variable, use the equal sign (=). Here’s a simple example: 要给Shell变量赋值,使用等号(=)。下面是一个简单的示例: ...
#This variable is global and can be used anywhere in this bash script VAR="global variable" function bash { #Define bash local variable #This variable is local to bash function only local VAR="local variable" echo $VAR } echo $VAR ...
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preserve_hostname: true Step 1b: Set the host name To make sure that the host name of the machine is reported correctly, change the/etc/hostnamefile to contain only the host name of the machine. hostname Step 1c: Assign a loopback address to the host name ...