file accessed time in linux using python -

-

this question continuation of question in another thread.since point of question different,i thought i'd post new question.

i experimented getting accessed time files in linux machine(ubuntu lucid),using python .the idea have function goes through files in particular directory,see if have been accessed in last 2 minutes,and print files have not been accessed.

for accessing file ,i defined readfile() method

def readfile(fname):     open(fname) f:         ct = f.read()         print 'read file at:',time.time()         print 'length of file:',len(ct)

for convenience ,i defined filenames

f1='/home/me/dev/misc/usedfiles/one.txt' f2='/home/me/dev/misc/usedfiles/two.txt' f3='/home/me/dev/misc/usedfiles/three.txt' f4='/home/me/dev/misc/usedfiles/four.txt'

sothat calling readfile(f1) access file one.txt

i defined function go through directory , print files not accessed in last 2 minutes

def files_not_accessed():     dirname = '/home/me/dev/misc/usedfiles'     filenames = os.listdir(dirname)     filenames = [os.path.join(dirname,filename) filename in filenames]     filename in filenames:         try:             last_access = os.stat(filename).st_atime #secs since epoch         except ioerror:             print 'could not info %s' % filename         else:             timediff =  time.time()-last_access             print filename,'  last_access=',last_access             print filename,'  timediff=',timediff             if timediff > 2*60:                 print filename,'---older 2 mts'         print ''

initially ran function files_not_accessed() , gave following output

/home/me/dev/misc/usedfiles/two.txt   last_access= 1341459500.0 /home/me/dev/misc/usedfiles/two.txt   timediff= 11668.9905779 /home/me/dev/misc/usedfiles/two.txt ---older 2 mts  /home/me/dev/misc/usedfiles/one.txt   last_access= 1341460126.0 /home/me/dev/misc/usedfiles/one.txt   timediff= 11042.990674 /home/me/dev/misc/usedfiles/one.txt ---older 2 mts  /home/me/dev/misc/usedfiles/three.txt   last_access= 1341459504.0 /home/me/dev/misc/usedfiles/three.txt   timediff= 11664.99072 /home/me/dev/misc/usedfiles/three.txt ---older 2 mts  /home/me/dev/misc/usedfiles/four.txt   last_access= 1341459510.0 /home/me/dev/misc/usedfiles/four.txt   timediff= 11658.990757 /home/me/dev/misc/usedfiles/four.txt ---older 2 mts

now,i ran readfile(f1) function read file one.txt

read file at: 1341471195.88 length of file: 47293

as can see output of files_not_accessed() function,the file one.txt last accessed @ 1341460126.0 ,and again read @ 1341471195.88 readfile(f1)

and (immediately)ran files_not_accessed() function , expected ,it not output file one.txt since accessed.i expected last_access time 1341471195.88

strangely,i again getting previous output

/home/me/dev/misc/usedfiles/two.txt   last_access= 1341459500.0 /home/me/dev/misc/usedfiles/two.txt   timediff= 11715.1272521 /home/me/dev/misc/usedfiles/two.txt ---older 2 mts  /home/me/dev/misc/usedfiles/one.txt   last_access= 1341460126.0 /home/me/dev/misc/usedfiles/one.txt   timediff= 11089.1273479 /home/me/dev/misc/usedfiles/one.txt ---older 2 mts  /home/me/dev/misc/usedfiles/three.txt   last_access= 1341459504.0 /home/me/dev/misc/usedfiles/three.txt   timediff= 11711.1273921 /home/me/dev/misc/usedfiles/three.txt ---older 2 mts  /home/me/dev/misc/usedfiles/four.txt   last_access= 1341459510.0 /home/me/dev/misc/usedfiles/four.txt   timediff= 11705.1274359 /home/me/dev/misc/usedfiles/four.txt ---older 2 mts

i cannot understand why file one.txt has last_access= 1341460126.0 instead of expected 1341471195.88

any idea why happens?

ubuntu lucid default mounts filesystems "relatime". if need strict atimes, need mount "strictatime" (at performance cost).


Comments

Post a Comment

Popular posts from this blog

c# - SVN Error : "svnadmin: E205000: Too many arguments" -

-
i trying reposotries using c# code process svncommand = null; var psi = new processstartinfo("svnadmin"); psi.redirectstandardoutput = true; psi.redirectstandarderror = true; psi.useshellexecute = false; psi.arguments= @"dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump"; using (svncommand = process.start(psi)) { var myoutput = svncommand.standardoutput; var myerror = svncommand.standarderror; debug.write("output :" + environment.newline + environment.newline + myoutput.readtoend() + environment.newline + "error :" + environment.newline + environment.newline + myerror.readtoend()); svncommand.close(); } when use dump command commandline svnadmin dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump it works fine when try ...
Read more

c# - Copy ObservableCollection to another ObservableCollection -

-
how copy observablecollection item observablecollection without reference of first collection? here observablecollection item value changes affecting both collections. code private observablecollection<ratemodel> _allmetalrate = new observablecollection<ratemodel>(); private observablecollection<ratemodel> _metalrateondate = new observablecollection<ratemodel>(); public observablecollection<ratemodel> allmetalrate { { return this._allmetalrate; } set { this._allmetalrate = value; notifypropertychanged("metalrate"); } } public observablecollection<ratemodel> metalrateondate { { return this._metalrateondate; } set { this._metalrateondate = value; notifypropertychanged("metalrateondate"); } } foreach (var item in metalrateondate) allmetalrate.add(item); what causing , how can solve it? you need clone object referenced item before it's a...
Read more

All overlapping substrings matching a java regex -

-
is there api method returns (possibly overlapping) substrings match regular expression? for example, have text string: string t = 04/31 412-555-1235; , , have pattern: pattern p = new pattern("\\d\\d+"); matches strings of 2 or more characters. the matches are: 04, 31, 412, 555, 1235. how overlapping matches? i want code return: 04, 31, 41, 412, 12, 55, 555, 55, 12, 123, 1235, 23, 235, 35. theoretically should possible -- there obvious o(n^2) algorithm enumerates , checks substrings against pattern. edit rather enumerating substrings, safer use region(int start, int end) method in matcher . checking pattern against separate, extracted substring might change result of match (e.g. if there non-capturing group or word boundary check @ start/end of pattern). edit 2 actually, it's unclear whether region() expect zero-width matches. specification vague, , experiments yield disappointing results. for example: string line = "xx90xx"; strin...
Read more