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Full Discussion: Split File Based on Line Number Pattern
Top Forums Shell Programming and Scripting Split File Based on Line Number Pattern Post 302242171 by radoulov on Wednesday 1st of October 2008 09:49:22 AM
Old 10-01-2008
Thanks era!

As far as I know [ngm]awk should maintain the files open until the end of the program or an explicit close call (close(filename)):

Code:
% strace  -eopen mawk '!(NR%10){print>(FILENAME 4);next}
{print>(FILENAME (++i))}i==3{i=0}' data
open("tls/i686/sse2/cmov/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
[snip]
open("/lib/tls/i686/cmov/libc.so.6", O_RDONLY) = 3
open("data", O_RDONLY)                  = 3
open("data1", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
open("data2", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 5
open("data3", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 6
open("data4", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 7
Process 8618 detached

Code:
% strace  -eopen gawk '!(NR%10){print>(FILENAME 4);next}
{print>(FILENAME (++i))}i==3{i=0}' data
open("tls/i686/sse2/cmov/libdl.so.2", O_RDONLY) = -1 ENOENT (No such file or directory)
[snip]
open("/usr/lib/locale/en_US.utf8/LC_TIME", O_RDONLY) = 3
open("data", O_RDONLY|O_LARGEFILE)      = 3
open("data1", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 4
open("data2", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 5
open("data3", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 6
open("data4", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 7
Process 8641 detached

Reading the strace output I notice some differences in read/write calls timings.
I'm quite sure that the below output does not show all time consuming events.

Code:
% strace -c mawk '!(NR%10){print>(FILENAME 4);next}
{print>(FILENAME (++i))}i==3{i=0}' data
Process 7865 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 73.48    0.003954           0     26097           write
 25.83    0.001390           0     26313           read
  0.69    0.000037           1        57        49 open
  0.00    0.000000           0        10           close
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         1           time
  0.00    0.000000           0         4         4 access
  0.00    0.000000           0         3           brk
  0.00    0.000000           0         5         5 ioctl
  0.00    0.000000           0         5           munmap
  0.00    0.000000           0         3           mprotect
  0.00    0.000000           0        13           mmap2
  0.00    0.000000           0        16        15 stat64
  0.00    0.000000           0         7           fstat64
  0.00    0.000000           0         1           set_thread_area
------ ----------- ----------- --------- --------- ----------------
100.00    0.005381                 52536        73 total

% rm data[1-4]                                     
% sync;sync                                        
% strace -c gawk '!(NR%10){print>(FILENAME 4);next}
{print>(FILENAME (++i))}i==3{i=0}' data
Process 7883 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 72.16    0.004391           0     26097           write
 27.21    0.001656           0     26102           read
  0.62    0.000038           0        89        72 open
  0.00    0.000000           0        17           close
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         5         5 access
  0.00    0.000000           0         3           brk
  0.00    0.000000           0         6         5 ioctl
  0.00    0.000000           0         6           munmap
  0.00    0.000000           0         4           mprotect
  0.00    0.000000           0         4           _llseek
  0.00    0.000000           0         3           rt_sigaction
  0.00    0.000000           0        22           mmap2
  0.00    0.000000           0        16        15 stat64
  0.00    0.000000           0        25           fstat64
  0.00    0.000000           0         2           getgroups32
  0.00    0.000000           0        13           fcntl64
  0.00    0.000000           0         1           set_thread_area
------ ----------- ----------- --------- --------- ----------------
100.00    0.006085                 52416        97 total

% rm data[1-4]                                     
% sync;sync                                        
% strace -c newawk '!(NR%10){print>(FILENAME 4);next}
{print>(FILENAME (++i))}i==3{i=0}' data
Process 7943 detached
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 98.90    0.123052           0   1000000           write
  1.10    0.001368           0     26101           read
  0.00    0.000000           0        64        52 open
  0.00    0.000000           0        15           close
  0.00    0.000000           0         1           execve
  0.00    0.000000           0         4         4 access
  0.00    0.000000           0         3           brk
  0.00    0.000000           0         7           munmap
  0.00    0.000000           0         3           mprotect
  0.00    0.000000           0         1           rt_sigaction
  0.00    0.000000           0        18           mmap2
  0.00    0.000000           0        16        15 stat64
  0.00    0.000000           0        12           fstat64
  0.00    0.000000           0         1           set_thread_area
------ ----------- ----------- --------- --------- ----------------
100.00    0.124420               1026246        71 total

 

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