[ken@Dell-Desktop ~]$declare -r c1=3[ken@Dell-Desktop ~]$echo$c13[ken@Dell-Desktop ~]$c1=4-bash:c1:readonly variable 我们通过declare -r声明了一个只读(readonly)的变量c1,之后如果尝试修改它的话,就会提示失败。 其实这个declare的用法颇有一点复杂,这里稍微进一步介绍下 点击查看代码 [ken@Dell-D...
An crray is like a series of slots that hold values. Each slot is known as an element, and each element can be accessed via a numerical index. An array element can contain a string or a number, and you can use it just like any other variable. The indices for arrays start at 0 and...
Bash编写中read $variable 命令是什么意思？Bash编写中read $variable 命令是什么意思？read $variable 是...
echo 'Please enter your name.' #Here we are reading the standard input and assigning it to the variable name with the read command. read name #We are now going back to standard output, by using echo and printing your name to the command line. echo "With standard input you have told m...
used to remove any special meaning for the next character read and for line continuation. Options, if supplied, have the fol- lowing meanings: -a aname The words are assigned to sequential indices of the array variable aname, starting at 0. aname is unset before any ...
Input is read from the current input stream (bash_input). yyparse leaves the parsed command in the global variable GLOBAL_COMMAND. This is where PROMPT_COMMAND is executed. */intparse_command(){...r=yyparse();if(need_here_doc)gather_here_documents();return(r);} parse...
grep'*foo*'file# Globs in regex contextsfind . -execfoo {} && bar {} \;# Prematurely terminated find -execsudoecho'Var=42'> /etc/profile# Redirecting sudotime --format=%s sleep 10# Passing time(1) flags to time builtinwhilereadh;dossh"$h"uptime# Commands eating while loop inputali...
select variable in listdo 循环体命令done① select 循环主要用于创建菜单,按数字顺序排列的示菜单项将显示在标准错误上,并显示PS3 提示符,等待用户输入② 用户输入菜单列表中的某个数字,执行相应的命令③ 用户输入被保存在内置变量 REPLY 中④ select 是个无限循环,因此要记住用 break 命令退出循环,或用 exit ...
#!/bin/bash #write a variable NAME=“William” #use that variable echo“Hello $NAME” 用户还可以通过用户输入来填充变量: #!/bin/bash echo“Hello $1, that is a $2 name” 在终端中: ~$bash name.sh “William” “great” Hello William, that is a great name 还可以使用 read 之类的命令...
exec跟ececFile不同的是,exec适合执行命令,eexecFile适合执行文件。 ◆node执行bash脚本: 进阶方案 shelljs 代码语言:javascript 代码运行次数:0 运行 AI代码解释 constshell=require('shelljs');# 删除文件命令 shell.rm('-rf','out/Release');// 拷贝文件命令shell.cp('-R','stuff/','out/Release');#...