How do I get the 'clear' command in Cygwin

问题:

I installed Cygwin, choosing a fairly minimal set of packages.

In a terminal, I tried to do 'clear' to clear the terminal, but I get

bash: clear: command not found

How do I get this to work?

回答1:

Install the Cygwin package ncurses; it is in the Utils category.

回答2:

This should do:

alias clear='printf "\033c"'

回答3:

just use this shortcut: Alt+F8 and Ctrl-L to skip page

回答4:

It's nice to have the clear.exe program for bash script files, so:

Windows Cygwin detail for clear.exe program command.

1. Download Cygwin setupx86.exe or whatever it's call at http://cygwin.com/

2. Run it and download from internet. *If you have a proxy connection, you may need to use Internet Explorer settings or set up custom proxy.

3. Choose all default settings, and finish the installation.

4. Run the installer a second time and again download from internet, but this time you will go into Utils, when it comes to the tree of files to customize your installation.

5. Expand Utils and get down to the ncurses" files. There, you will click on the skip item, to the left of the ncurses utils (there are a few).

6. After changing from skip to whatever version of ncurses you want to install, continue the installation, and finish.

7. Run the installer again and this time you will expand Lib aka libraries.

8. Find the terminfo library installer, and again change skip to the newest version, then continue and complete the installation.

NOTE You might end up having to log out of Windows and log back in, or just reboot before the new programs take effect. This is due to the possibility of Cygwin background session.

NOTE You also must do the three separate installations.

回答5:

Use cygcheck command to check what package it is in (adding .exe to your cmd string, in this example: clear.exe)

> cygcheck -p 'clear.exe'
Found 4 matches for clear.exe
ncurses-debuginfo-5.9-20150307-1 - ncurses-debuginfo: Debug info for ncurses (installed binaries and support files)
ncurses-debuginfo-5.9-20150404-1 - ncurses-debuginfo: Debug info for ncurses (installed binaries and support files)
ncurses-5.9-20150307-1 - ncurses: Terminal display utilities (installed binaries and support files)
ncurses-5.9-20150404-1 - ncurses: Terminal display utilities (installed binaries and support files)

and you know you have to install ncurses package using cygwin installer.

回答6:

Right click > Reset... (Alt + F8) worked for me... (on Cygwin-x86-2.830)

回答7:

I tried in my system: It works:

Just use: cntrl+l

Hope this help!

回答8:

Open Windows Explorer then navigate to:

[Cygwin Installation Directory]\home\[User]\

e.g.: C:\cygwin\home\wreckseal

then open the file .bashrc with Notepad++.

Move your cursor at the end of the last line and hit Enter key, then add the text below.

alias cls='echo -e "\033c"'

or the text below:

alias cls='printf "\033c"'

Restart cygwin, type cls. Done!

Note that there's no scrollbar after sending the cls command. I prefer the printf version than the echo version. Try it yourself!

回答9:

General approach to such problems:
Search on the Cygwin-package search page with the full executable name.

Now the package search can be done in several ways:

• Basic search by executable basename.
  Package search for clear:
  https://cygwin.com/cgi-bin2/package-grep.cgi?grep=clear
  -> Found 194 matches for clear

• Better matches by including the .exe suffix.
  Package search for clear.exe:
  https://cygwin.com/cgi-bin2/package-grep.cgi?grep=clear.exe
  -> Found 6 matches for clear.exe

• And even better matches by also including the / prefix.
  Package search for /clear.exe:
  https://cygwin.com/cgi-bin2/package-grep.cgi?grep=/clear.exe
  -> Found 4 matches for /clear.exe

And all of these 4 matches are now from the ncurses packages. (Namely 2 debug and 2 stable versions.

(Pro tip: Right-click the search-field and create a customized search engine. I have set this to the shortcut cp for "cygwin package" in both Firefox and Chrome.)

回答10:

I just came across this project and so far, I think it's awesome

https://github.com/transcode-open/apt-cyg

after installing it, you can run

apt-cyg install ncurses

I personally prefer installing libraries using this tool over the Cygwin tool b/c the Cygwin versions all have .exe appended to them, and can be cumbersome when copying and pasting Linux commands (off of SO, for instance).