/* Delete the character under the cursor. Given a numeric argument, kill that many characters instead. */intrl_delete(count, key)intcount, key; {intxpoint;if(count <0)return(_rl_rubout_char (-count, key));if(rl_point == rl_end) { rl_ding ();return-1; }if(count >1|| rl_ex...
command [option] [argument] ``` 其中mand表示要执行的命令,option表示命令的选项,argument表示命令的参数。在这个格式中,参数是命令的重要组成部分,它可以用来对命令进行具体的操作。 三、Bash命令中参数的位置 在Bash中,参数的位置是非常重要的。一般来说,参数可以分为两种:位置参数和选项参数。位置参数是指在命令...
logout 退出登录shell。 mapfile [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array] readarray [-n count] [-O origin] [-s count] [-t] [-u fd] [-C callback] [-c quantum] [array] 将标准输入的行读取到索引数组变量array中,如果提供了-u选...
(命令)命令替换:测试变量存在与否:(命令)命令替换:测试变量存在与否:{countor:-'num'} 判断条件,如果countor存在,就返回值,如果countor不存在,就把-后接的字符串当做整个变量扩展的结果,并传回 测试变量不存在或为空,传回一个默认值 ${myname:-'nick'} 如果待测变量不存在或为空,传回-后的值,存在则传...
ShellCheck is a GPLv3 tool that gives warnings and suggestions for bash/sh shell scripts: The goals of ShellCheck are To point out and clarify typical beginner's syntax issues that cause a shell to give cryptic error messages. To point out and clarify typical intermediate level semantic problems...
test $(($count - 2)) -eq 2命令可以获取到count变量值,并减去 2,获取到这个算术运算的结果,然后跟整数 2 进行比较,最终返回 0。 [[ 命令 在bash 中,可以使用[[复合命令来评估条件表达式。 查看man bash 对[[命令的说明如下: [[ expression ]] ...
The condition in the IF statement was true, so only the firstechocommand was executed. Now let’s run the program with5as the first argument: bashsimpleelif.sh 5 ## 5 is a great number The first condition is false since 5 is not equal to 4, but then the next condition in the ELIF...
/bin/bashecho"Argument one is $1"echo"Argument two is $2"echo"Argument three is $3" 保存文件,使其可执行: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 chmod+x arguments.sh 然后运行文件并传递3个参数: 代码语言:javascript 代码运行次数:0...
Write a Bash script that searches for a specific string (provided as an argument) in a text file named "document.txt". Code: #!/bin/bash # Check if the number of arguments is less than 1 if [ $# -lt 1 ]; then echo "Usage: $0 <search_string>" ...
The return code is zero, unless end-of-file is encountered, read times out (in which case it's greater than 128), a variable assignment error occurs, or an invalid file descriptor is supplied as the argument to -u. 即,read命令从标准输入读取到一行,每行内容以换行符结尾,但是读取到的内容...