# 强制退出i# insertesc# to command mode:w# save ,有:的命令叫ex command# moveh, j, k, l ctrl-f/b numberG gg# 第一个字符G last line of the file0(zero) 行首 ^ To the first non-whitespace character on the current line.$endof current line w beginning ofnextwordorpunctuation W ig...
root@raspberry:~# ddif=/home/user/Downloads/debian.iso of=/dev/sdb1 bs=512M; sync 注意:在上面的例子中,usb设备就是sdb1(你应该使用lsblk命令验证它,否则你会重写你的磁盘或者系统),请慎重使用磁盘的名,切忌。 dd 命令在执行中会根据文件的大小和类型 以及 usb设备的读写速度,消耗几秒到几分钟不等。
# 基础使用 ubuntu@VM-8-8-ubuntu:/tmp$ cheat cp # To copy a file: cp ~/Desktop/foo.txt ~/Downloads/foo.txt # To copy a directory: cp -r ~/Desktop/cruise_pics/ ~/Pictures/ # To create a copy but ask to overwrite if the destination file already exists: cp -i ~/Desktop/foo....
--update 仅追加比归档中副本更新的文件 -x, --extract, --get 从归档中解出文件 操作修饰符: --check-device 当创建增量归档时检查设备号(默认) -g, --listed-incremental=FILE 处理新式的 GNU 格式的增量备份 -G, --incremental 处理老式的 GNU 格式的增量备份 --ignore-failed-read...
# Check the existence of jstack command! if ! which jstack &> /dev/null; then [ -z "$JAVA_HOME" ] && { redEcho "Error: jstack not found on PATH!" exit 1 } ! [ -f "$JAVA_HOME/bin/jstack" ] && { redEcho "Error: jstack not found on PATH and $JAVA_HOME/bin/jstack file...
File exists(文件已存在) In this case, you probably tried to create a file that already exists. This is common when you try to create a directory with the same name as a file. 在这种情况下,您可能尝试创建一个已经存在的文件。当您尝试以与文件同名的方式创建一个目录时,这种情况很常见。
2.3.4 touch The touch command creates a file. If the file already exists, touch does not change it, but it does update the file’s modification time stamp printed with the ls -l command. For example, to create an empty file, enter this: touch命令用于创建文件。
Next, let’s check out if user peter exists in the /etc/passwd file using the getent command: $ getent passwd peter peter:x:1000:1000:PETER KARANJA,,,:/home/peter:/bin/bashCopy This command allows us to read various text files known as databases. It has various options for databases,...
bindkey - Binds keys to an edit command. All bindings will be shown if no options is specified. bison - Generates a parser program for specified grammar file. bltin - Runs the internal command in the shell. break - Exits from a for, foreach, while, select or until loop. builtin - ...
1) 命令行模式command mode) 控制屏幕光标的移动,字符、字或行的删除,查找,移动复制某区段及进入Insert mode下,或者到 last line mode。 命令行模式下的常用命令: 【1】控制光标移动:↑,↓,j 【2】删除当前行:dd 【3】查找:/字符 【4】进入编辑模式:i o a ...