Bash cannot return values, whether a single value or an array, but it can return a status (the same as other programs). However, there are multiple turnarounds that we can use to return an array from a function.
function does not contain a return statement, its status is set based on the status of the last statement executed in the function. To actually return arbitrary values to the caller you must use other mechanisms. The simplest way to return a value from a bash function is to just set a gl...
return [n] Copy Bash Download If used: inside a function. Return value specified by n. If n is omitted, the return status is that of the last command executed in the function body. outside a function, during execution of a script by the . (source) command, it causes the shell ...
/bin/bash -xi=$1 #变量i的值取第1个参数的值iftest $i-gt89;then #如果i>89echo'A'elif test $i-gt79;then #如果i>79echo'B'elif test $i-eq60-o $i-gt60;then #如果i=60或i>60(即:i>=60) echo'C'elif test $i-gt0;then #如果i>0echo'D'elif test $i-lt0;then #如果i<0ec...
Return 1 有错误返回 五、函数返回值测试 可以直接在脚本调用函数语句的后面使用最后状态命令来测试函数调用的返回值。例如: check_it_is_a_directory $FILENAME # this is the function call and check if [ $? == 0 ] # use the last status command now to test ...
Input is read from the current input stream (bash_input). yyparse leaves the parsed command in the global variable GLOBAL_COMMAND. This is where PROMPT_COMMAND is executed. */intparse_command(){...r=yyparse();if(need_here_doc)gather_here_documents();return(r);} parse...
1. A function is read directly into the shell's memory and stored for later use. Since computer memory is not an issue nowadays, using functions is faster than repeating code. 2. Functions help organize long shell scripts into modular and reusable code blocks. The chunks are easier to devel...
Bash functions differ from most programming languages when it comes to returning a value from a function. By default, bash returns theexit statusof the last executed command in the function's body. The script below shows how to specify the exit status using return: ...
What is a bash function? How to define and use functions in Bash? Function Variables Function Arguments Function Return How to delete a function? Nested Functions How to debug a bash function? Get an existing function definition Tracing code with traps Find where a bash function is defined ...
function hide_all PressReturnand in the new line created type { Use thedown arrowkey to move the cursor down to the line below the “Defaults…FALSE” line and pressReturn. In the new line created type } Then pressReturn. Type function show_all ...