last post, we learned how to see all the contents of a folder – invisible and visible files – in the Terminal. However, most of us prefer working in the GUI, so this post is going to show you how to work a bit of Terminal magic to easily turn on and off your invisible files an...
1.Vim的使用 一般指令模式:vim进去模式的模式 编辑模式:在一般模式下按 “i, I, o, O, a, A, r, R” 可以进入编辑模式 命令行命令模式:在一般模式下输入 “: / ?” 任意一个,可以将光标移动到最下面那一列 vim fileName可以新建一个文件,编辑完后按ESC输入:wq即可完成编辑且退出,若文件权限不对无法...
$ unset x $ showvar $x is not set $ x=3 $ showvar $x is not set $ export x $ showvar $x = 3 $ x= ## in bash, reassignment doesn't remove a variable from the environment $ showvar $x is set but empty 注意 showvar不是一个 bash 命令,而是一个如清单 5-1 所示的脚本,...
context while the set or shopt builtins will set the attribute for all functions being executed. ⚠️ The bash shell option extdebug will enable more than just function tracing, see the next section. ⚠️ Be careful when enabling trap on functions’ RETURN as it may change how your ...
bash启动的时候会运行各种不同的脚本。当bash作为一个登录的交互shell被调用,或者作为非交互shell但带有--login参数被调用时,它首先读入并执行文件/etc/profile。然后它会依次寻找~/.bash_profile,~/.bash_login,和~/.profile,读入并执行第一个存在且可读的文件。--noprofile参数可以阻止bash启动时的这种行为。当一...
Commands: status Show current time settings set-time TIME Set system time set-timezone ZONE Set system time zone list-timezones Show known time zones set-local-rtc BOOL Control whether RTC is in local time set-ntp BOOL Control whether NTP is enabled timedatectl命令用法如下:...
27 ip addr show $1 28 fi 5、创建/etc/rc.d/init.d/network服务脚本 1 #!/bin/bash 2 # 3 #chconfig: 35 09 90 #设定启动级别3|5,启动优先级09,关闭优先级90 4 #description: network service #描述信息 5 . /etc/rc.d/init.d/functions #读取functions函数文件 ...
If everything goes well, then you collect your files in parallel because you don’t have more than ten systems. You can afford to ssh to all of them at the same time and then show the hardware details of each one. Visiting: dmaf5 ...
Both functions use local and global variables to pass values around. If you need to shuffle an array larger than 32768 entries or your array is not a dense indexed array, then use the first method above using shuf. We want to ensure that every permutation is equally likely when shuffling ...
set show-all-if-ambiguous on 按tab键补全时,单个tab会尝试部分补全当前单词。如果无法完成部分完成,则要连按两下tab以显示所有可能的补全选项。show-all-if-ambiguous on的作用是将补全行为设置为单个tab执行两个步骤:补全单词,如果补全内容不明确,则显示所有可能的补全选项。 例如,你输入v然后按一下tab,即能显...