_repeat() { #@ USAGE: _repeat string number _REPEAT=$1 while (( ${#_REPEAT} < $2 )) ## Loop until string exceeds desired length do _REPEAT=$_REPEAT$_REPEAT$_REPEAT ## 3 seems to be the optimum number done _REPEAT=${_REPEAT:0:$2} ## Trim to desired length } repeat() { ...
Here is a example of while loop controlled by standard input. Until the redirection chain from STDOUT to STDIN to the read command exists the while loop continues. #!/bin/bash# This bash script will locate and replace spaces # in the filenames DIR="." # Controlling a loop with bash re...
/bin/bash 这一行表明,不管用户选择的是那种交互式shell,该脚本需要使用bash shell来运行。由于每种shell的语法大不相同,所以这句非常重要。 简单实例 下面是一个非常简单的shell脚本。它只是运行了几条简单的命令 1 2 3 4 #!/bin/bash echo"hello, $USER. I wish to list some files of yours" echo"lis...
Command'pirntf'not found, did you mean:command'printf'from deb coreutils(8.32-4.1ubuntu1)Try:sudoaptinstall<deb name> 从结果可以看到在执行命令后标准错误被正确写入error.txt文件。 总结 The uses of stdin, stdout, and stderr are explained in this tutorial using multiple examples that will help ...
问osascript GUI命令的Bash问题EN我试图自动化在OSX中启动应用程序的过程，并在安全代理提示符下输入管理...
alias amzcdnmdel = '/home/scripts/admin/cdn/purge_cdn_cache --profile amazon --stdin' 总结 本文总结了 *nix bash 别名的多种用法: 为命令设置默认的参数(例如通过alias ethtool='ethtool eth0'设置 ethtool 命令的默认参数为 eth0)。 修正错误的拼写(通过alias cd..='cd ..'让cd..变成cd ..)...
[ $PASSCHK -ge 1 ]; then echo "UID: $NEW_UID seems to exist check /etc/passwd" else useradd -u $NEW_UID -c "$NEW_COMMENT" -md $NEW_HOMEDIR -s $NEW_SHELL -g $NEW_GROUP -G $NEW_ADDGROUP $NEW_USER if [ ! -z $NEW_PASS ]; then echo $NEW_PASS | passwd --stdin $...
[ "2" = "useradd" ]&& (echo westos | passwd --stdinNAME) else ###否则,删除用户 echoNAME3 fi done fi } if [ "$1" = "create" ] then ACTION -z "useradd" 'exist' $2 ###调用函数 elif [ "$1" = "delete" ] then ACTION...
Using -n prevents jq from reading stdin on its own, leaving the entirety of the input stream available to be read by input and inputs -- 前者读取单行,后者读取所有剩余行。 ( -R ,对于原始输入,会导致读取文本行而不是 JSON 对象)。 使用[$keys, $vals] | transpose[] ,我们正在生成 [key,...
它类似于 DOS下的command和后来的cmd.exe。它接收用户命令,然后调用相应的应用程序。 shell 是一个命令语言解释器(command-language interpreter)。拥有...Bash shell 一、认识bash shell 1、登录取得的shell就记录在/etc/passwd这个文件内 可以使用cat /etc/passwd查看 2、bash shell 功能 a. 命令记忆能力(...