vimvariable.sh 2. Add the following code to the script: var1=1 var2=1change() {echoInsidefunctionechoVariable 1 is:$var1echoVariable 2 is:$var2localvar1=5 var2=5echoechoAfter change insidefunctionechoVariable 1 is locally$var1echoVariable 2 is globally$var2}echoBeforefunctioninvocationecho...
if (exit_immediately_on_error) variable_context = 0; /* not in a function */ EOF_Reached = EOF;该赋值将会导致函数主体循环while (EOF_Reached == 0)退出,进而readerloop退出。 goto exec_done; …… exec_done: QUIT; } indirection_level--; return (last_command_exit_value); 从reader_loop...
问将NS3返回/退出代码(通过waf)捕获为Bash脚本中的变量ENbash中的变量 <span style="display: inline !
read命令接收键盘的输入,标准输入(Standard Input) read -p "PROMPT MESSAGE" VARIABLE 其中PROMPT MESSAGE为提示用户的信息,变量VARIABLE可以保存用户的输入,可以在程序中使用该变量 #!/bin/bash read -p "Please Enter You Name: " NAME echo "Your Name Is: $NAME" 测试 测试主要用于条件判断。[ condition-t...
regex`trap'exit 42'sigint# Unportable signal speccmd &> file# Unportable redirection operatorreadfoo < /dev/tcp/host/22# Unportable intercepted filesfoo-bar() { ..; }# Undefined/unsupported function name[$UID= 0 ]# Variable undefined in dash/shlocalvar=value# local is undefined in shtim...
API_RESPONSE_RETURN false msg # 两个参数: API_RESPONSE_RETURN false code API_RESPONSE_RETURN(){ local ret=true local errcode=0 local errmsg="" local data=null case $# in 1) ret=${1} ;; 2) ret="$1" # echo "===" # echo "$2" | od -c # echo "===" # 两个参数: # 第...
To get the exit code of any command, use the “$?” variable alongside the echo command or printf command. Example: The “0” return code indicates that the command was successful. It implies that the file “intro.txt” exists and the Linux/UNIX system could read it without errors. ...
或者在文件 /etc/profile 末尾追加如下代码: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 which(){type"$@"||{echo>&2"I require $@ , but it's not installed. Aborting.";return1;}} 再重开 shell 窗口,即可替代系统原有的 which 命令。 参考: man bash...
# Create the variable name. $ var="world" $ ref="hello_$var" # Print the value of the variable name stored in 'hello_$var'. $ printf '%s\n' "${!ref}" value 1. 2. 3. 4. 5. 6. 7. 8. 9. 或者,在bash4.3+上:
bash: return: string: numeric argument required 2 To return actual data, including returning strings or large numbers, you can either use the standard output or a global variable. # Example using the standard output [me@linux ~]$ fn() { echo $1; } [me@linux ~]$ fn 2; A=$(fn ...