20170114-2 选题

2025-02-03 23:40:14 +08:00 · 2017-01-14 18:17:22 +08:00 · 2017-01-14 18:17:22 +08:00 · 4492fe2b19
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+Set Date and Time for Each Command You Execute in Bash History
+============================================================
+
+By default, all commands executed by Bash on the command line are stored in history buffer or recorded in a file called ~/.bash_history. This means that a system administrator can view a list of commands executed by users on the system or a user can view his/her command history using the [history command][1] like so.
+
+```
+$ history
+```
+[
+ ![Linux History Command](http://www.tecmint.com/wp-content/uploads/2017/01/Linux-History-Command.png) 
+][2]
+
+Linux History Command
+
+From the output of the [history command][3] above, the date and time when a command was executed is not shown. This is the default setting on most if not all Linux distributions.
+
+In this article, we will explain how you can configure time stamp information when each command in the Bash history was executed to be displayed.
+
+The date and time associated with each history entry can be written to the history file, marked with the history comment character by setting the HISTTIMEFORMAT variable.
+
+There are two possible ways of doing this: one does it temporarily while the other makes it permanent.
+
+To set HISTTIMEFORMAT variable temporarily, export it as below on the command line:
+
+```
+$ export HISTTIMEFORMAT='%F %T'
+```
+
+In the export command above, the time stamp format:
+
+1.  `%F` – expands to full date same, as %Y-%m-%d (year-month-date).
+2.  `%T` – expands to time; same as %H:%M:%S (hour:minute:seconds).
+
+Read through the [date command][4] man page for additional usage information:
+
+```
+$ man date
+```
+
+Then check your command history as follows:
+
+```
+$ history 
+```
+[
+ ![Display Linux Command History with Date and Time](http://www.tecmint.com/wp-content/uploads/2017/01/Set-Date-and-Time-on-Linux-Commands-History.png) 
+][5]
+
+Display Linux Command History with Date and Time
+
+However, if you want to configure this variable permanently, open the file `~/.bashrc` with your favorite editor:
+
+```
+$ vi ~/.bashrc
+```
+
+And add the line below in it (you mark it with a comment as your own configuration):
+
+```
+#my config
+export HISTTIMEFORMAT='%F %T'
+```
+
+Save the file and exit, afterwards, run the command below to effect the changes made to the file:
+
+```
+$ source ~/.bashrc
+```
+
+That’s all! Do share with us any interesting history command tips and tricks or your thoughts about this guide via the comment section below.
+
+--------------------------------------------------------------------------------
+
+作者简介：
+
+![](http://1.gravatar.com/avatar/7badddbc53297b2e8ed7011cf45df0c0?s=128&d=blank&r=g)
+
+I am Ravi Saive, creator of TecMint. A Computer Geek and Linux Guru who loves to share tricks and tips on Internet. Most Of My Servers runs on Open Source Platform called Linux. Follow Me: Twitter, Facebook and Google+
+
+--------------------------------------------------------------------------------
+
+via: http://www.tecmint.com/display-linux-command-history-with-date-and-time/
+
+作者：[Ravi Saive][a]
+译者：[译者ID](https://github.com/译者ID)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]:http://www.tecmint.com/author/admin/
+[1]:http://www.tecmint.com/history-command-examples/
+[2]:http://www.tecmint.com/wp-content/uploads/2017/01/Linux-History-Command.png
+[3]:http://www.tecmint.com/history-command-examples/
+[4]:http://www.tecmint.com/sort-ls-output-by-last-modified-date-and-time/
+[5]:http://www.tecmint.com/wp-content/uploads/2017/01/Set-Date-and-Time-on-Linux-Commands-History.png