.TH HIER 7.SH NAMEhier \- file system hierarchy.SH DESCRIPTIONThe following outline gives a quick tour througha representative directory hierarchy..na.nh.IP /root.PD 0.IP /dev/devices (4).RS.IP consolemain console,.IR tty (4).IP tty*terminals,.IR tty (4).IP catphototypesetter.IR cat (4).IP rp*disks,.I rp,.IR hp (4).IP rrp*raw disks,.I rp,.IR hp (4).IP ....RE.IP /bin/utility programs, cf /usr/bin/ (1).RS.IP asassembler first pass,cf /usr/lib/as2.IP ccC compiler executive,cf /usr/lib/c[012].IP ....RE.IP /lib/object libraries and other stuff, cf /usr/lib/.RS.IP libc.asystem calls, standard I/O, etc. (2,3,3S).IP libm.amath routines (3M).IP libplot.aplotting routines,.IR plot (3).IP libF77.aFortran runtime support.IP libI77.aFortran I/O.IP ....IP as2second pass of.IR as (1).IP c[012]passes of.IR cc (1).IP ....RE.IP /etc/essential data and dangerous maintenance utilities.RS.IP passwdpassword file,.IR passwd (5).IP groupgroup file,.IR group (5).IP motdmessage of the day,.IR login (1).IP mtabmounted file table,.IR mtab (5).IP ddatedump history,.IR dump (1).IP ttysproperties of terminals,.IR ttys (5).IP gettypart of.IR login ,.IR getty (8).IP initthe father of all processes,.IR init (8).IP rcshell program to bring the system up.IP cronthe clock daemon,.IR cron (8).IP mount.IR mount (1).IP wall.IR wall (1).IP ....RE.IP /tmp/temporary files, usually on a fast device, cf /usr/tmp/.RS.IP e*used by.IR ed (1).IP ctm*used by .IR cc (1).IP ....RE.IP /usr/general-pupose directory, usually a mounted file system.RS.IP adm/administrative information.RS.IP wtmplogin history,.IR utmp (5).IP messageshardware error messages.IP tracctphototypesetter accounting,.IR troff (1).IP vpacctline printer accounting.IR lpr (1).RE.RE.IP /usr\t/bin.RSutility programs, to keep /bin/ small.IP tmp/temporaries, to keep /tmp/ small.RS.IP stm*used by.IR sort (1).IP rasterused by.IR plot (1).RE.IP dict/word lists, etc..RS.IP wordsprincipal word list, used by.IR look (1).IP spellhisthistory file for.IR spell (1).RE.IP games/.RS.IP bjblackjack.IP hangman.IP quiz.k/what.IR quiz (6)knows.RS.IP indexcategory index.IP africacountries and capitals.IP ....RE.IP ....RE.IP include/standard #include files.RS.IP a.out.hobject file layout,.IR a.out (5).IP stdio.hstandard I/O,.IR stdio (3).IP math.h(3M).IP ....IP sys/system-defined layouts, cf /usr/sys/h.RS.IP acct.hprocess accounts,.IR acct (5).IP buf.hinternal system buffers.IP ....RE.RE.IP lib/object libraries and stuff, to keep /lib/ small.RS.IP lint[12]subprocesses for.IR lint (1).IP llib-lcdummy declarations for /lib/libc.a, used by.IR lint (1).IP llib-lmdummy declarations for /lib/libc.m.IP atrunscheduler for.IR at (1).IP struct/passes of.IR struct (1).IP ....IP tmac/macros for.IR troff (1).RS.IP tmac.anmacros for.IR man (7).IP tmac.smacros for.IR ms (7).IP ....RE.IP font/fonts for.IR troff (1).RS.IP RTimes Roman.IP BTimes Bold.IP ....RE.IP uucp/programs and data for.IR uucp (1).RS.IP L.sysremote system names and numbers.IP uucicothe real copy program.IP ....RE.IP suftabtable of suffixes for hyphenation, used by.IR troff (1).IP unitsconversion tables for.IR units (1).IP eignlist of English words to be ignored by.IR ptx (1).RE.RE.IP /usr/\tman/.RSvolume 1 of this manual,.IR man (1).RS.IP man0/general.RS.IP introintroduction to volume 1,.IR ms (7)format.IP xxtemplate for manual page.RE.IP man1/chapter 1.RS.IP as.1.IP mount.1m.IP ....RE.IP cat1/preprinted pages for man1/.RS.IP as.1.IP mount.1m.RE.IP ....RE.IP spool/delayed execution files.RS.IP at/used by .IR at (1).IP lpd/used by.IR lpr (1).RS.IP lockpresent when line printer is active.IP cf*copy of file to be printed, if necessary.IP df*daemon control file,.IR lpd (8).IP tf*transient control file, while .I lpris working.RE.IP uucp/work files and staging area for .IR uucp (1).RS.IP LOGFILEsummary log.IP LOG.*log file for one transaction.RE.RE.IP mail/mailboxes for.IR mail (1).RS.TP.I uidmail file for user.I uid.TP.IR uid .locklock file while.I uidis receiving mail.RE.TP.I wdinitial working directory of a user,typically.I wdis the user's login name.RS.TP.BR . profileset environment for.IR sh (1),.IR environ (5).IP calendaruser's datebook for.IR calendar (1).RE.IP doc/papers, mostly in volume 2 of this manual, typically in.IR ms (7)format.RS.IP as/assembler manual.IP cC manual.IP ....RE.IP sys/system source.RS.IP dev/device drivers.RS.IP bio.ccommon code.IP cat.c.IR cat (4).IP dh.cDH11,.IR tty (4).IP tty.IR tty (4).IP ....RE.IP conf/hardware-dependent code.RS.IP mch.sassembly language portion.IP confconfiguration generator.IP ....RE.IP h/header (include) files.RS.IP acct.h.IR acct (5).IP stat.h.IR stat (2).IP ....RE.IP sys/source for system proper.RS.IP main.c.IP pipe.c.IP sysent.csystem entry points.IP ....RE.RE.RE.IP /usr/\tsrc/.RSsource programs for utilities, etc..RS.IP cmd/source of commands.RS.IP as/assembler.RS.IP makefilerecipe for rebuilding the assembler.IP as1?.ssource of pass1.RE.IP ar.csource for.IR ar (1).IP ....IP troff/source for.I nroffand.IR troff (1).RS.IP nmakemakefile for.I nroff.IP tmakemakefile for.I troff.IP font/source for font tables, /usr/lib/font/.RS.IP ftR.cRoman.IP ....RE.IP term/terminal characteristics tables, /usr/lib/term/.RS.IP tab300.cDASI 300.IP ....RE.IP ....RE.RE.IP libc/source for functions in /lib/libc.a.RS.IP crt/C runtime support.RS.IP ldiv.sdivision into a long.IP lmul.smultiplication to produce long.IP ....RE.IP csu/startup and wrapup routines needed with every C program.RS.IP crt0.sregular startup.IP mcrt0.smodified startup for.I cc \-p.RE.IP sys/system calls (2).RS.IP access.s.IP alarm.s.IP ....RE.IP stdio/standard I/O functions (3S).RS.IP fgets.c.IP fopen.c.IP ....RE.IP gen/other functions in (3).RS.IP abs.c.IP atof.c.IP ....RE.IP compallshell procedure to compile libc.IP mklibshell procedure to make /lib/libc.a.RE.IP libI77/source for /lib/libI77.IP libF77/.IP ....IP games/source for /usr/games.RE.RE.ad.SH SEE ALSOls(1), ncheck(1), find(1), grep(1).SH BUGSThe position of files is subject to change without notice.