#! /usr/bin/env python # Watch line printer queue(s).# Intended for BSD 4.3 lpq. import posiximport sysimport timeimport string DEF_PRINTER = 'psc'DEF_DELAY = 10 def main():    delay = DEF_DELAY # XXX Use getopt() later    try:        thisuser = posix.environ['LOGNAME']    except:        thisuser = posix.environ['USER']    printers = sys.argv[1:]    if printers:        # Strip '-P' from printer names just in case        # the user specified it...        for i in range(len(printers)):            if printers[i][:2] == '-P':                printers[i] = printers[i][2:]    else:        if posix.environ.has_key('PRINTER'):            printers = [posix.environ['PRINTER']]        else:            printers = [DEF_PRINTER]    #    clearhome = posix.popen('clear', 'r').read()    #    while 1:        text = clearhome        for name in printers:            text = text + makestatus(name, thisuser) + '\n'        print text        time.sleep(delay) def makestatus(name, thisuser):    pipe = posix.popen('lpq -P' + name + ' 2>&1', 'r')    lines = []    users = {}    aheadbytes = 0    aheadjobs = 0    userseen = 0    totalbytes = 0    totaljobs = 0    while 1:        line = pipe.readline()        if not line: break        fields = string.split(line)        n = len(fields)        if len(fields) >= 6 and fields[n-1] == 'bytes':            rank = fields[0]            user = fields[1]            job = fields[2]            files = fields[3:-2]            bytes = eval(fields[n-2])            if user == thisuser:                userseen = 1            elif not userseen:                aheadbytes = aheadbytes + bytes                aheadjobs = aheadjobs + 1            totalbytes = totalbytes + bytes            totaljobs = totaljobs + 1            if users.has_key(user):                ujobs, ubytes = users[user]            else:                ujobs, ubytes = 0, 0            ujobs = ujobs + 1            ubytes = ubytes + bytes            users[user] = ujobs, ubytes        else:            if fields and fields[0] <> 'Rank':                line = string.strip(line)                if line == 'no entries':                    line = name + ': idle'                elif line[-22:] == ' is ready and printing':                    line = name                lines.append(line)    #    if totaljobs:        line = '%d K' % ((totalbytes+1023)/1024)        if totaljobs <> len(users):            line = line + ' (%d jobs)' % totaljobs        if len(users) == 1:            line = line + ' for %s' % (users.keys()[0],)        else:            line = line + ' for %d users' % len(users)            if userseen:                if aheadjobs == 0:                    line =  line + ' (%s first)' % thisuser                else:                    line = line + ' (%d K before %s)' % (                                   (aheadbytes+1023)/1024, thisuser)        lines.append(line)    #    sts = pipe.close()    if sts:        lines.append('lpq exit status %r' % (sts,))    return string.joinfields(lines, ': ') if __name__ == "__main__":    try:        main()    except KeyboardInterrupt:        pass