HOST="google.com"ping -c1$HOST # -c is usedforcount, it will send the request, number of times mentionedRETURN_CODE=$? # 最后运行的命令的结束代码(返回值)即执行上一个指令的返回值if["$RETURN_CODE"-eq"0"]thenecho"$HOST reachable"elseecho"$H...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: check-scripts:# Fail if any of these files have w...
The statementCALLER=`basename $0`is used to get the name of the script being run. In that way, you do not need to hard-code the script name in the script. Thus, when you make a copy of the script, it will take less work to adapt the newly derived script. The statementTEMP=`getop...
local code=${2-1}#defaultexit status1msg"$msg"exit"$code"}parse_params(){#defaultvaluesofvariablessetfrom params flag=0param=''while:;docase"${1-}"in-h|--help)usage;;-v|--verbose)set-x;;--no-color)NO_COLOR=1;;-f|--flag)flag=1;;# example flag-p|--param)# example named ...
shell的return(没写return的函数, return的值就被称为status code? ) 类似python等语言的return, echo对标print Common options (GNU Coreutils) ‘-d file’ ‘-f file’ 这俩没有相互包含关系 好多参数 -n 判断是否非空 ${#var}will get the length of $var The test command doesn't understand ==,...
解释型语言也被称作“脚本语言”。执行这类程序时,解释器(interpreter)需要读取我们编写的源代码(source code),并将其转换成目标代码(object code),再由计算机运行。因为每次执行程序都多了编译的过程,因此效率有所下降。 使用脚本编程语言的好处是,它们多半运行在比编译型语言还高的层级,能够轻易处理文件与目录之类的...
值并发生重复赋值时,bash会覆盖该键。这 允许我们有效地删除数组重复。 CAVEAT:需要bash4+ 示例功能: remove_array_dups() { # Usage: remove_array_dups "array" declare -A tmp_array for i in "$@"; do [[ $i ]] && IFS=" " tmp_array["${i:- }"]=1 ...
回答 混合使用 Bash 和 Expect 可能不是达到期望效果的最佳方式。...return send "my_command1\r" interact -o -nobuffer -re $prompt return send "my_command2\r" interact bash.../bin/bash /usr/bin/expect -c 'expect "\n" { eval spawn ssh -oStrictHostKeyChecking=no -oCheckHostIP=no ...
首选项错误码:code:"401” err: Error: Parameter error. The type of 'value' must be ValueType. 如何排查问题 如何查看或导出持久化数据? 如何获知数据存储沙箱路径? 插入数据之后,RDB数据库的wal文件体积异常 用户首选项是线程安全的吗 为什么在关系型数据库中调用deleteRdbStore函数后并未真实删除数据...
get_functions() { # Usage: get_functions IFS=$'\n' read -d "" -ra functions < <(declare -F) printf '%s\n' "${functions[@]//declare -f }" }绕过shell别名# alias ls # command # shellcheck disable=SC1001 \ls绕过shell函数