The customer is running a pipeline command, when using "echo $?", only the return value of last command could be got, how to get the return value from the second command?Raw # df |awk '{print $5}' |grep /mnt 2>&1 | tee ./log; echo $? 1 Environment Red Hat Enterprise ...
echo ${arr[3]} # get a value of arr 运行代码: bash test21.sh 7 大括号({ }) 文件名扩展 复制t.txt 的内容到 t.back 中 vim test22.sh 输入代码: #!/bin/bash if [ ! -w 't.txt' ]; then touch t.txt fi echo 'test text' >> t.txt cp t.{txt,back} 运行代码: bash test22...
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...
${variable#pattern} # if the pattern matches the beginning of the variable's value, delete the shortest part that matches and return the rest ${variable##pattern} # if the pattern matches the beginning of the variable's value, delete the longest part that matches and return the rest ${va...
echo "Option $optname has value $OPTARG" ;; "?") echo "Unknown option $OPTARG" ;; ":") echo "No argument value for option $OPTARG" ;; *) # Should not occur echo "Unknown error while processing options" ;; esac done return $OPTIND ...
if declared inside the function. global_result="some result" # Another, better option to return a value from a function is # to send the value to stdout using echo or printf like shown below: echo "$func_result" # The return status can be specified by using # the return ...
operate-and-get-next (C-o) 接受當前行,加以執行,從歷史中取出相對當前行的下一行進行編輯。 任何參數都被忽略。 edit-and-execute-command (C-xC-e) 啓動一個編輯器,編輯當前命令行,將結果作爲 shell 命令運行。 Bash 將依次試着運行 $FCEDIT, $EDITOR, 和 emacs 作爲編輯器。 Commands for Changing ...
/bin/bash # 方法一:直接赋值 array1=("value1" "value2" "value3") # 方法二:使用索引赋值 array2[0]="value1" array2[1]="value2" array2[2]="value3" # 方法三:从字符串分割赋值 string="value4 value5 value6" array3=($string) # 方法四:使用read命令赋值 echo "Enter values separated...
Get the location 代码语言:javascript 代码运行次数:0 运行 AI代码解释 script_dir=$(cd"$(dirname "${BASH_SOURCE[0]}")"&>/dev/null&&pwd-P) 这行代码尽其所能定义脚本的位置目录,然后我们对其进行cd配置。为什么? 通常,我们的脚本在相对于脚本位置的路径上运行,复制文件并执行命令,假设脚本目录也是一个...
operate-and-get-next(^O) 接受当前行作为命令予以执行,并从命令历史缓冲区中摘取相对于当前行 的下一个命令行进行编辑,忽略任何参数。 edit-and-execute-command (C-xC-e) 针对当前命令行调用编辑器,把编辑后的结果作为Shell命令予以执行。bash 将会依次尝试调用VISUAL和EDITOR变量定义的编辑器,以及emacs编 辑器...