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translating-----geekpi
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How to use the history command in Linux
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======
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As I spend more and more time in terminal sessions, it feels like I'm continually finding new commands that make my daily tasks more efficient. The GNU `history` command is one that really changed my work day.
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The GNU `history` command keeps a list of all the other commands that have been run from that terminal session, then allows you to replay or reuse those commands instead of retyping them. If you are an old greybeard, you know about the power of `history`, but for us dabblers or new sysadmin folks, `history` is an immediate productivity gain.
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### History 101
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To see `history` in action, open a terminal program on your Linux installation and type:
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```
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$ history
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```
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Here's the response I got:
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```
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1 clear
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2 ls -al
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3 sudo dnf update -y
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4 history
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```
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The `history` command shows a list of the commands entered since you started the session. The joy of `history` is that now you can replay any of them by using a command such as:
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```
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$ !3
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```
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The `!3` command at the prompt tells the shell to rerun the command on line 3 of the history list. I could also access that command by entering:
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```
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linuser@my_linux_box: !sudo dnf
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```
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`history` will search for the last command that matches the pattern you provided and run it.
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### Searching history
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You can also use `history` to rerun the last command you entered by typing `!!`. And, by pairing it with `grep`, you can search for commands that match a text pattern or, by using it with `tail`, you can find the last few commands you executed. For example:
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```
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$ history | grep dnf
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3 sudo dnf update -y
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5 history | grep dnf
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$ history | tail -n 3
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4 history
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5 history | grep dnf
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6 history | tail -n 3
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```
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Another way to get to this search functionality is by typing `Ctrl-R` to invoke a recursive search of your command history. After typing this, the prompt changes to:
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```
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(reverse-i-search)`':
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```
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Now you can start typing a command, and matching commands will be displayed for you to execute by pressing Return or Enter.
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### Changing an executed command
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`history` also allows you to rerun a command with different syntax. For example, if I wanted to change my previous command `history | grep dnf` to `history | grep ssh`, I can execute the following at the prompt:
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```
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$ ^dnf^ssh^
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```
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`history` will rerun the command, but replace `dnf` with `ssh`, and execute it.
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### Removing history
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There may come a time that you want to remove some or all the commands in your history file. If you want to delete a particular command, enter `history -d <line number>`. To clear the entire contents of the history file, execute `history -c`.
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The history file is stored in a file that you can modify, as well. Bash shell users will find it in their Home directory as `.bash_history`.
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### Next steps
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There are a number of other things that you can do with `history`:
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* Set the size of your history buffer to a certain number of commands
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* Record the date and time for each line in history
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* Prevent certain commands from being recorded in history
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For more information about the `history` command and other interesting things you can do with it, take a look at the [GNU Bash Manual][1].
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/18/6/history-command
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作者：[Steve Morris][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://opensource.com/users/smorris12
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[1]:https://www.gnu.org/software/bash/manual/
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@ -0,0 +1,130 @@
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如何在 Linux 中使用 history 命令
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======
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随着我在终端中花费越来越多的时间，我感觉就像不断地寻找新的命令，使我的日常任务更加高效。GNU 的 `history` 命令是一个真正改变我日常工作的命令。
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GNU `history` 命令保存了从该终端会话运行的所有其他命令的列表，然后允许你重放或者重用这些命令，而不用重新输入它们。如果你是一个老玩家，你知道 `history` 的力量，但对于我们这些半吊子或新手系统管理员来说， `history` 是一个立竿见影的生产力增益。
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### History 101
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要查看 `history`，请在 Linux 中打开终端程序，然后输入：
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```
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$ history
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```
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这是我得到的响应：
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```
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1 clear
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2 ls -al
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3 sudo dnf update -y
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4 history
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```
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`history` 命令显示自开始会话后输入的命令列表。 `history` 有趣的地方是你可以使用以下命令重放任意一个命令：
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```
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$ !3
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```
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提示符中的 `!3` 告诉 shell 重新运行历史列表中第 3 个命令。我还可以输入以下命令来使用：
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```
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linuser@my_linux_box: !sudo dnf
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```
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`history` 将搜索与你提供的模式相匹配的最后一个命令并运行它。
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### 搜索历史
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你还可以输入 `!!` 重新运行 `history` 的最后一条命令。而且，通过与` grep` 配对，你可以搜索与文本模式相匹配的命令，或者通过与 `tail` 一起使用，你可以找到你最后几条执行的命令。例如：
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```
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$ history | grep dnf
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3 sudo dnf update -y
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5 history | grep dnf
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$ history | tail -n 3
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4 history
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5 history | grep dnf
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6 history | tail -n 3
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```
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另一种实现这个功能的方法是输入 `Ctrl-R` 来调用你的命令历史记录的递归搜索。输入后，提示变为：
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```
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(reverse-i-search)`':
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```
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现在你可以开始输入一个命令，并且会显示匹配的命令，按回车键执行。
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### 更改已执行的命令
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`history` 还允许你使用不同的语法重新运行命令。例如，如果我想改变我以前的命令 `history | grep dnf` 成 `history | grep ssh`，我可以在提示符下执行以下命令：
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```
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$ ^dnf^ssh^
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```
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`history` 将重新运行该命令，但用 `ssh` 替换 `dnf`，并执行它。
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### 删除历史
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有时你想要删除一些或全部的历史记录。如果要删除特定命令，请输入 `history -d <行号>`。要清空历史记录，请执行 `history -c`。
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历史文件存储在一个你可以修改的文件中。bash shell 用户可以在他们的家目录下找到 `.bash_history`。
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### 下一步
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你可以使用 `history` 做许多其他事情：
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* 将历史缓冲区设置为一定数量
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* 记录历史中每行的日期和时间
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* 防止某些命令被记录在历史记录中
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有关 `history` 命令的更多信息和其他有趣的事情，请参考[ GNU Bash 手册][1]。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/18/6/history-command
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作者：[Steve Morris][a]
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选题：[lujun9972](https://github.com/lujun9972)
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:https://opensource.com/users/smorris12
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[1]:https://www.gnu.org/software/bash/manual/
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