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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 3] 3.8 What tty Am I On? </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly & Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1998-08-04T21:32:37Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-260-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch03_01.htm"TITLE="3. Logging Out"><LINKREL="prev"HREF="ch03_07.htm"TITLE="3.7 Detaching a Session with screen "><LINKREL="next"HREF="ch04_01.htm"TITLE="4. 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Organizing Your Home Directory"BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-1150">3.8 What tty Am I On? </A></H2><PCLASS="para">Each login session has its own<SPANCLASS="link"><EMCLASS="emphasis">tty</EM> (<ACLASS="linkend"HREF="ch38_06.htm"TITLE="The Controlling Terminal ">38.6</A>)</SPAN>-a UNIX device file that handlesinput and output for your terminal, window, etc.Each tty has its own filename.If you're logged on more than once and other users want to<SPANCLASS="link"><EMCLASS="emphasis">write</EM> or <EMCLASS="emphasis">talk</EM> (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>to you, they need to know which tty to use.If you have processes running on several ttys, you can tell which processis where.</P><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-4277"></A>To do that, run the <EMCLASS="emphasis">tty</EM> command at a shell prompt in the window:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>tty</B></CODE>/dev/tty07</PRE></BLOCKQUOTE></P><PCLASS="para">You can tell other users to type <CODECLASS="literal">write</CODE> <CODECLASS="replaceable"><I>your-username</I></CODE> <CODECLASS="literal">tty07</CODE>.</P><PCLASS="para">Some systems have different kinds of ttys: a few dialup terminals, somenetwork ports for<SPANCLASS="link"><EMCLASS="emphasis">rlogin</EM> and <EMCLASS="emphasis">telnet</EM>, etc. (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>.You or your system administrator can look in a system file like<EMCLASS="emphasis">/etc/ttys</EM>to find out which ttys are used for what.You can use this to make your login setup more automatic.For example, most network terminals on our computer have names like<CODECLASS="literal">/dev/ttyp</CODE><CODECLASS="replaceable"><I>x</I></CODE> or <CODECLASS="literal">/dev/ttyq</CODE><CODECLASS="replaceable"><I>x</I></CODE>, where <CODECLASS="replaceable"><I>x</I></CODE> is asingle digit or letter.I have a test in my<SPANCLASS="link"><EMCLASS="emphasis">.logout</EM> file (<ACLASS="linkend"HREF="ch03_01.htm#UPT-ART-4800"TITLE="Running Commands When You Log Out ">3.1</A>)</SPAN>that clears the screen and prints a<SPANCLASS="link">fortune (<ACLASS="linkend"HREF="ch03_03.htm"TITLE="Electronic Fortune Cookies ">3.3</A>)</SPAN>on all ttys except network:</P><PCLASS="para"><TABLECLASS="screen.co"BORDER="1"><TR><THVALIGN="TOP"><PRECLASS="calloutlist"> <ACLASS="co"HREF="ch09_16.htm"TITLE="9.16 Command Substitution ">` `</A> <ACLASS="co"HREF="ch47_04.htm"TITLE="47.4 C Shell Variable Operators and Expressions ">!~</A> </PRE></TH><TDVALIGN="TOP"><PRECLASS="screen"># Clear screen and print fortune on non-network ttys:if ("`tty`" !~ /dev/tty[pq]*) then clear fortuneendif</PRE></TD></TR></TABLE></P><TABLECLASS="para.programreference"BORDER="1"><TR><THVALIGN="TOP"><ACLASS="programreference"HREF="examples/index.htm"TITLE="tty">tty</A><BR></TH><TDVALIGN="TOP"> The GNU version of <EMCLASS="emphasis">tty</EM> is on the CD-ROM.</TD></TR></TABLE><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">JP</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch03_07.htm"TITLE="3.7 Detaching a Session with screen "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 3.7 Detaching a Session with screen "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="book"HREF="index.htm"TITLE="UNIX Power Tools"><IMGSRC="gifs/txthome.gif"SRC="gifs/txthome.gif"ALT="UNIX Power Tools"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="CHAPTER"HREF="ch04_01.htm"TITLE="4. 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