Read histograms from file and plot
                                                                        
1     HISTOGRAM/FILE 1 PAWHISTS.HBOOK                                                                            
2     HRIN  *                                                                                                    
3     LDIR                                                                                                       
3     HI/LIST                                                                                                    
5     ZON 2 2                                                                                                    
      hi/pl 100                                                                                                         
      set htyp 244                                                                                                      
      hi/pl 110                                                                                                         
5     ZONE 1 2 2 'S'                                                                                             
      hi/plot 200                                                                                                       
4     CLOSE 1                                                                                                    
6     HI/DEL 100,200                                                                                             

1. In this example the existing file PAWHISTS.HBOOK is attached in READ-ONLY mode.
2. The command HRIN * (or HRIN 0 ) gets all the histograms from the file PAWHISTS.HBOOK into the memory. Note that commands like HIST/PLOT take automatically the histogram from the file if it is not already in memory.
3. Both LDIR and HI/LIST give the list of the histograms. LDIR is the generic command to list the content of a ZEBRA file. It has no knowledge about the objects stored in the file that's why it cannot retrieve the histogram names. The HBOOK specific command HIST/LIST is able to find informations on the histogram like the histogram title and the histogram type. On the next page is given the output of these two commands.
4. To release an histogram file it is enough to do CLOSE n where `` n '' is the logical unit number used by the command HIST/FILE .

   Note also:

5. The usage of the command ZONE . It is used two times to define zones with different sizes.
6. In some commands, some parameters have the attributes Loop . This is visible in the help:

   HELP of HISTOGRAM/DELETE
                                                                                     
    * HISTOGRAM/DELETE ID                                                                                                  
                                                                                                                           
      ID         C 'Histogram Identifier'  Loop                                                                            
                                                                                                                           
      Delete histogram/Ntuple ID in Current Directory (memory).  If ID=0 delete                                            
      all histograms and Ntuples.  To delete histograms in disk files use                                                  
      command HIO/HSCRATCH.                                                                                                
   

   When a list of parameters (separated by ``,'') is given PAW execute the invoked command for each parameter in the list.

Output of LDIR
                                                                                            
 ************** Directory ===> //LUN1 <===                                                                              
                                                                                                                        
                  Created 941121/1116  Modified 941208/1413                                                             
                                                                                                                        
 ===> List of objects                                                                                                   
     HBOOK-ID  VARIABLE                             CYCLE    DATE/TIME   NDATA                                          
        100         0                                   2   941121/1116    151                                          
        110         0                                   2   941121/1116     85                                          
        200         0                                   2   941121/1116    780                                          
                                                                                                                        
  Number of records =    5  Number of megawords =  0 +  4250 words                                                      
  Per cent of directory quota used =    .016                                                                            
  Per cent of file used            =    .016                                                                            
  Blocking factor                  =  23.164                                                                            

Output of HIST/LIST before HISTOGRAM/DELETE
                                                               
 ===> Directory :                                                                                                       
        100 (1)   HTFUN1.F                                                                                              
        110 (1)   Test 1-dim Histo                                                                                      
        200 (2)   HTFUN2                                                                                                

Output of HIST/LIST after HISTOGRAM/DELETE
                                                                
 ===> Directory :                                                                                                       
        110 (1)   Test 1-dim Histo