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       printcap - 打印机相容性数据库




       Printcaptermcap(5)  的簡單版,  用來描述  line  printers.  當用到  spool  系  統時,
       一定會去參考       printcap       這個檔.       允許動態地加入及刪除印表機.       在這資料
       庫中的每一段敘述代表一台印表機.  This data base may not be substituted for, as is possible
       for termcap, because it may allow accounting to be bypassed.

       預設的印表機是  lp,  雖然環境變數  PRINTER   可能優於(override)此.   每一   個用到   spool
       的軟體都支援  -p 的選項, 用以選擇印表機. 如果想知道如何為一 台印表機設定資料的討論, 請參照
       4.3 BSD Line Printer Spooler Manual.


       根據 termcap(5) 對檔案輸出的描述.
            Name       Type      Description
            af         str       NULL                   name of accounting file
            br         num       none                   if lp is a tty, set the baud
                                                        rate (ioctl(2) call)
            cf         str       NULL                   cifplot data filter
            df         str       NULL                   tex data filter (DVI format)
            fc         num       0                      if lp is a tty, clear flag
                                                        bits (sgtty.h)
            ff         str       `                   string to send for a form
            fo         bool      false                  print a form feed when
                                                        device is opened
            fs         num       0                      like `fc' but set bits
            gf         str       NULL                   graph data filter (plot(3)
            hl         bool      false                  print the burst header page
            ic         bool      false                  driver supports(non standard)
                                                        ioctl to indent printout
            if         str       NULL                   name of text filter which
                                                        does accounting
            lf         str       /dev/console           error logging file name
            lo         str       lock                   name of lock file
            lp         str       /dev/lp                device name to open for
            mx         num       1000                   maximum file size (in BUFSIZ
                                                        blocks), zero = unlimited
            nd         str       NULL                   next directory for list of
                                                        queues (unimplemented)
            nf         str       NULL                   ditroff data filter (device
                                                        independent troff)
            of         str       NULL                   name of output filtering
            pc         num       200                    price per foot or page in
                                                        hundredths of cents
            pl         num       66                     page length (in lines)
            pw         num       132                    page width (in characters)
            px         num       0                      page width in pixels
            py         num       0                      page length in pixels
            rf         str       NULL                   filter for printing FORTRAN
                                                        style text files
            rg         str       NULL                   restricted group. Only
                                                     members of group allowed access
            rm         str       NULL                   machine name for remote
            rp         str       ``lp''                 remote printer name argument
            rs         bool      false                  restrict remote users to
                                                        those with local accounts
            rw         bool      false                  open the printer device for
                                                        reading and writing
            sb         bool      false                  short banner (one line only)
            sc         bool      false                  suppress multiple copies
            sd         str       /var/spool/lpd         spool directory
            sf         bool      false                  suppress form feeds
            sh         bool      false                  suppress printing of burst
                                                        page header
            st         str       status                 status file name
            tf         str       NULL                   troff data filter (cat
            tr         str       NULL                   trailer string to print when
                                                        queue empties
            vf         str       NULL                   raster image filter

       如果本地端印表機(local  line  printer)   driver   支援   indentation   的話,   daemon   將


       lpd(8)  守护进程將創造出一個過濾的管線  (pipeline of filters) 來處理各個不同印 表機的檔案.
       過濾器將依照旗標來選擇將何者送到 lpr(1) .  管線的設定值有:
                  p            pr | if regular text + pr(1)
                  none         If         regular text
                  c            cf         cifplot
                  d            df         DVI (tex)
                  g            gf         plot(3)
                  n            nf         ditroff
                  f            rf         Fortran
                  t            tf         troff
                  v            vf         raster image

       if 過濾器的用法是:
                  if [-c] -wwidth -llength -iindent -n login -h host acct-file

       -c 這個旗標只有在 -l 旗標有列在 lpr 中時才可忽略. width 和 length 定義  了  page  的長和寬
       (from  pw  and pl respectively). -n 和 -h 可指定列印工作擁有者 的 login name 和 host name.
       Acct-file 將忽略 printcap 中的描述.

       If no if is specified, of is used instead, with the distinction that  of  is  opened  only
       once,  while  if  is  opened  for  every  individual  job.   Thus,  if is better suited to
       performing accounting.  The of is only given the width and length flags.

                  filter -xwidth -ylength -n login -h host acct-file

       如果要用 pixels 為單位來定長寬的話, 用 px  和  py  這二個變數.   所有的過濾器都經由  stdin
       輸入檔案, stdout 輸出到印表機, 用 stderr 或 syslog(3) 來記錄(log), 而且不會忽略 SIGINT.


       Error  messages  generated  by  the  line  printer  programs  themselves (that is, the lp*
       programs) are logged by syslog(3) using the LPR facility.  Messages printed on  stderr  of
       one  of  the filters are sent to the corre- sponding lf file.  The filters may, of course,
       use syslog themselves.

       Error messages sent to the console have a carriage return and  a  line  feed  appended  to
       them, rather than just a line feed.


       termcap(5),  lpc(8),  lpd(8),  pac(8),  lpr(1),  lpq(1),  lprm(1)
       4.3 BSD Line Printer Spooler Manual.


       The printcap file format appeared in 4.2BSD..


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