怎样设置man退出时屏幕不留内容

shijiann

在一台机器上使用man帮助命令退出后屏幕什么都没留下，只有命令本身，例如
hddu002$ man ls
hddu002$ man ps
hddu002$

而在另一台机器上，man命令退出后，屏幕上帮助的内容还在。如下：
hddu003$ man ls
Reformatting page.  Please Wait... done

User Commands                                               ls(1)

NAME
     ls - list contents of directory

SYNOPSIS
     /usr/bin/ls  [-aAbcCdeEfFghHilLmnopqrRstuvVx1@] [file]...

     /usr/xpg4/bin/ls  [-aAbcCdeEfFghHilLmnopqrRstuvVx1@]
     [file]...

     /usr/xpg6/bin/ls  [-aAbcCdeEfFghHilLmnopqrRstuvVx1@]
     [file]...

DESCRIPTION
     For each file that is a directory, ls lists the contents  of
     the  directory.  For  each file that is an ordinary file, ls
。。。（略去一些内容）

hddu003$

谁知道怎么设置man退出后，man中的内容不显示？

renxiao2003

我这里也是有的。

gilet

1. #man ls;clear

复制代码

折中方法

unixlinuxsys

回复 3# gilet


    都是这样的啊

nagaregawa

你是字符界面的吗？

shijiann

百度上没找到，Google了半天，终于找到了英文的。

简单地说就是：
     export PAGER='less'     退出后不保留屏幕
       export PAGER='less -X'      退出后保留屏幕

======================================================
How to prevent Linux man pages from clearing after you quit reading

Man pages are excellent resources for learning the specifics of a Linux command. After all, who can remember all the nitty gritty of a command?

One annoyance of reading man pages on some Linux distributions is that after you quit reading it, the contents are cleared off screen. The man page contents simply don't stay around after you quit man. If that happens to you, it means that the default pager for viewing man pages is the less command, and that is how less behaves.

Wiping man contents out or not is a personal preference. Some may like the man stuff being wiped out because it won't clutter up the command window. However, there are times when you want the man contents to be visible after you finish reading it. You will have that information in front of you when you enter the next command.

The good news is that you can change the man page behavior. This is done by changing the default pager from less to something like more.

[beranger-org has a great/better suggestion: instead of changing to more, use less -X]
You can change it permanently or on demand, and for everyone or just individual users. Because it is a personal preference, I would recommend changing it only for yourself.

First, you need to find out where more is.


$ which more/bin/more

Add the following line in the .bashrc file in your home directory:

export PAGER=/bin/more

If you want to stick with less, add this line instead.

export PAGER='less -X'

That customizes the PAGER environment variable every time a shell process is started.

Beware that the default pager is also used in commands other than man. less is a more powerful pager than more. You may wish just to change the PAGER for the current shell session. This can be done by typing in the exact export statement above into the command line.

If you want to revert to the default PAGER (i.e., less), enter this:

$ unset PAGER

If you really insist on changing the default man behavior permanently for everyone on your system, edit the file /etc/man.config (on RedHat-based systems) or /etc/manpath.config on Debian-based systems, and change the line for PAGER. This affects only man page viewing. Alternatively, you can run update-alternatives --config pager (for Debian) or alternatives --config pager (for RedHat) to globally change the PAGER environment variable for all applications.



This is how you can control man when it exits.


http://linuxcommando.blogspot.co ... man-pages-from.html

renxiao2003

回复 6# shijiann


    学习了。不错。

inknk

我虽然也见过，但从来没想过原因
看来凡事都要问个为什么才能学到东西啊！
谢谢了。。。。。。。。。。

vermouth

好像本地man后不删除，远程登陆都会被清理掉。

taojie2000

这个分系统吧 版本  现在用的rh6  cent5.5 用着都直接删除了