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Asked: 2026-06-01T09:46:16+00:00

I have a text file, which looks like this: node13 state = free np

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I have a text file, which looks like this:

node13 
    state = free 
np = 8 
properties = beta,eightcores 
ntype = cluster 
status = opsys=linux,uname=Linux node13 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64,sessions=? 15201,nsessions=? 01,nusers=0,idletime=6837317,totmem=20506268kb,availmem=20259728kb,physmem=20506268kb,ncpus=8,loadave=0.00,gres=,netload=17130666575,se=free,jobs=,varattr=,rectime=1333639375 

node14 
    state = job-exclusive 
np = 8 
properties = beta,eightcores 
ntype = cluster

I want to grab nodes only if they are free. For that I have to make a regexp which will match node(..) only if the following line has state = free. Can You help me with this?

Edit:

Nothing works so far. May be because I’m not reading in the file, but

proc = subprocess.Popen("pbsnodes", stdout=subprocess.PIPE)
listOfFreeNodes = proc.stdout.read()

Could it harm the solutions some-how? Here’s the full pbsnodes output:

node01                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node01 2.6.27.19-5-01,nusers=0,idletime=861913,totmem=16432576kb,availmem=16=free,jobs=,varattr=,rectime=1333641123                  

node02                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node02 2.6.27.19-5-nusers=2,idletime=5357510,totmem=16432576kb,availmem=1617ree,jobs=,varattr=,rectime=1333641107                    

node03                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node03 2.6.27.19-5-s=1,idletime=8564681,totmem=16432576kb,availmem=16029924kobs=60966.hpchead.linux,varattr=,rectime=1333641119      

node04                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node04 2.6.27.19-5-01,nusers=0,idletime=8564678,totmem=16432576kb,availmem=1e=free,jobs=,varattr=,rectime=1333641124                 

node05                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node05 2.6.27.19-5-01,nusers=0,idletime=2072593,totmem=16432652kb,availmem=1=free,jobs=,varattr=,rectime=1333641091                  

node06                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node06 2.6.27.19-5-s=1,idletime=9038,totmem=16432576kb,availmem=16200960kb,p,varattr=,rectime=1333641096                             

node07                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node07 2.6.27.19-5-s=1,idletime=8564671,totmem=16432576kb,availmem=16173848kobs=,varattr=,rectime=1333641134                         

node08                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node08 2.6.27.19-5- 21356,nsessions=5,nusers=1,idletime=8564604,totmem=1643219260329746,state=free,jobs=,varattr=,rectime=1333641095 

node09                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node09 2.6.27.19-5-01,nusers=0,idletime=8564648,totmem=16432552kb,availmem=1e=free,jobs=,varattr=,rectime=1333641126                 

node10                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node10 2.6.27.19-5-2,nsessions=5,nusers=1,idletime=6821493,totmem=16432552kb036941,state=free,jobs=,varattr=,rectime=1333641133      

node11                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node11 2.6.27.19-5-01,nusers=0,idletime=8564599,totmem=16432556kb,availmem=1e=free,jobs=,varattr=,rectime=1333641120                 

node12                                                   
     state = free                                        
     np = 8                                              
     properties = alpha,eightcores                       
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node12 2.6.27.19-5-01,nusers=0,idletime=8564627,totmem=16432556kb,availmem=1e=free,jobs=,varattr=,rectime=1333641121                 

node13                                                   
     state = free                                        
     np = 8                                              
     properties = beta,eightcores                        
     ntype = cluster                                     
     status = opsys=linux,uname=Linux node13 2.6.27.19-5-01,nusers=0,idletime=6839072,totmem=20506268kb,availmem=2e=free,jobs=,varattr=,rectime=1333641130                 

node14                                                   
     state = job-exclusive                               
     np = 8                                              
     properties = beta,eightcores                        
     ntype = cluster                                     
     jobs = 0/66481.hpchead.linux, 1/66481.hpchead.linux,chead.linux, 6/66481.hpchead.linux, 7/66481.hpchead.linux
     status = opsys=linux,uname=Linux node14 2.6.27.19-5-,nusers=1,idletime=8568052,totmem=24635060kb,availmem=206free,jobs=66481.hpchead.linux,varattr=,rectime=1333641132

node15                                                   
     state = job-exclusive                               
     np = 8                                              
     properties = beta,eightcores                        
     ntype = cluster                                     
     jobs = 0/66482.hpchead.linux, 1/66482.hpchead.linux,chead.linux, 6/66482.hpchead.linux, 7/66482.hpchead.linux
     status = opsys=linux,uname=Linux node15 2.6.27.19-5-,nusers=1,idletime=8567636,totmem=24635012kb,availmem=212free,jobs=66482.hpchead.linux,varattr=,rectime=1333641092

node16                                                   
     state = job-exclusive                               
     np = 8                                              
     properties = beta,eightcores                        
     ntype = cluster                                     
     jobs = 0/66481.hpchead.linux, 1/66481.hpchead.linux,chead.linux, 6/66481.hpchead.linux, 7/66481.hpchead.linux
     status = opsys=linux,uname=Linux node16 2.6.27.19-5-=1,idletime=8564418,totmem=24634928kb,availmem=20700104kbbs=66481.hpchead.linux,varattr=,rectime=1333641117       

node17                                                   
     state = job-exclusive                               
     np = 8                                              
     properties = beta,eightcores                        
     ntype = cluster                                     
     jobs = 0/66482.hpchead.linux, 1/66482.hpchead.linux,chead.linux, 6/66482.hpchead.linux, 7/66482.hpchead.linux
     status = opsys=linux,uname=Linux node17 2.6.27.19-5-s=1,idletime=6824915,totmem=24634928kb,availmem=20598068kbs=66482.hpchead.linux,varattr=,rectime=1333641113       

node21                                                   
     state = job-exclusive                               
     np = 12                                             
     properties = blade                                  
     ntype = cluster                                     
     jobs = 0/66483.hpchead.linux, 1/66483.hpchead.linux,chead.linux, 6/66483.hpchead.linux, 7/66483.hpchead.linux.hpchead.linux                                           
     status = opsys=linux,uname=Linux node21 2.6.27.19-5-,nusers=1,idletime=8569176,totmem=26790348kb,availmem=203e=free,jobs=66483.hpchead.linux,varattr=,rectime=13336411

node22                                                   
     state = job-exclusive                               
     np = 12                                             
     properties = blade                                  
     ntype = cluster                                     
     jobs = 0/66475.hpchead.linux, 1/66475.hpchead.linux,chead.linux, 6/66475.hpchead.linux, 7/66475.hpchead.linux.hpchead.linux                                           
     status = opsys=linux,uname=Linux node22 2.6.27.19-5-users=1,idletime=8569178,totmem=26790348kb,availmem=21384free,jobs=66475.hpchead.linux,varattr=,rectime=1333641118

node23                                                   
     state = job-exclusive                               
     np = 12                                             
     properties = blade
     ntype = cluster
     jobs = 0/66484.hpchead.linux, 1/66484.hpchead.linux, 2/66484.hpchead.linux, 3/66484.hpchead.linux, 4/66484.hpchead.linux, 5/66484.hpchead.linux, 6/66484.hpchead.linux, 7/66484.hpchead.linux, 8/66484.hpchead.linux, 9/66484.hpchead.linux, 10/66484.hpchead.linux, 11/66484.hpchead.linux
     status = opsys=linux,uname=Linux node23 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64,sessions=10309 10370,nsessions=2,nusers=1,idletime=8569255,totmem=26790348kb,availmem=20165484kb,physmem=24685876kb,ncpus=12,loadave=12.01,gres=,netload=21742922098,state=free,jobs=66484.hpchead.linux,varattr=,rectime=1333641120

node24
     state = job-exclusive
     np = 12
     properties = blade
     ntype = cluster
     jobs = 0/66485.hpchead.linux, 1/66485.hpchead.linux, 2/66485.hpchead.linux, 3/66485.hpchead.linux, 4/66485.hpchead.linux, 5/66485.hpchead.linux, 6/66485.hpchead.linux, 7/66485.hpchead.linux, 8/66485.hpchead.linux, 9/66485.hpchead.linux, 10/66485.hpchead.linux, 11/66485.hpchead.linux
     status = opsys=linux,uname=Linux node24 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64,sessions=11157 11218,nsessions=2,nusers=1,idletime=8569254,totmem=26790348kb,availmem=21489804kb,physmem=24685876kb,ncpus=12,loadave=12.05,gres=,netload=18486923435,state=free,jobs=66485.hpchead.linux,varattr=,rectime=1333641114

node25
     state = job-exclusive
     np = 12
     properties = blade
     ntype = cluster
     jobs = 0/66469.hpchead.linux, 1/66469.hpchead.linux, 2/66469.hpchead.linux, 3/66469.hpchead.linux, 4/66469.hpchead.linux, 5/66469.hpchead.linux, 6/66469.hpchead.linux, 7/66469.hpchead.linux, 8/66469.hpchead.linux, 9/66469.hpchead.linux, 10/66469.hpchead.linux, 11/66469.hpchead.linux
     status = opsys=linux,uname=Linux node25 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64,sessions=6711 6772,nsessions=2,nusers=1,idletime=8569282,totmem=26790348kb,availmem=21082316kb,physmem=24685876kb,ncpus=12,loadave=12.00,gres=,netload=15199518313,state=free,jobs=66469.hpchead.linux,varattr=,rectime=1333641095

Edit:

Thanks to all those who have answered.

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1 Answer

  1. Editorial Team

    This should return the correct node value(s)

    r'node\d+(?=[^\n]*\n\s*state\s*=\s*free)'

    This uses a positive lookahead to peek past the end of line, but not capture anything it finds. It only matches the node value.

    l = re.findall(r'node\d+(?=[^\n]*\n\s*state\s*=\s*free)', s)
print l
>>> ['node13']

    Edit: Inspired by a comment from @hexparrot, I realized there is a simpler way. This regex r'node\d+(?=\s*state\s*=\s*free)' is simpler, also works, even though it does not explicitly search for a newline (since the \s includes EOL characters). HOWEVER… it also does not guarantee that the state=free will be found on the following line, as stated in the OP’s requirements. It would also match node99 state=free on the same line. So explicitly searching for the \n better meets the OP’s requirements.

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