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Top Forums Shell Programming and Scripting A script that processes a sample of a file Post 302818201 by c_lady on Friday 7th of June 2013 05:57:47 AM
Old 06-07-2013
A script that processes a sample of a file

hi all, I need some help in regards of how to process just a sample from a large .txt file

I have a large file from many new lines (say above 200.000 new lines), I need a script that process just a sample of it, say 10.000 bur a random sample (taking rows from top top to the the bottom)

Could someone help? I will be happy, if you could also enable me to give the number of sample as an input - for example, if I need 20.000 instead of 10.000 to give the 20.000 as input

Thanks a lot!
 

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UALARM(3)						   BSD Library Functions Manual 						 UALARM(3)

NAME
ualarm -- schedule signal after specified time LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> useconds_t ualarm(useconds_t useconds, useconds_t interval); DESCRIPTION
This is a simplified interface to setitimer(2). The ualarm() function waits a count of useconds before asserting the terminating signal SIGALRM. System activity or time used in processing the call may cause a slight delay. If the interval argument is non-zero, the SIGALRM signal will be sent to the process every interval microseconds after the timer expires (e.g., after useconds number of microseconds have passed). Due to a setitimer(2) restriction, the maximum number of useconds and interval is limited to 100,000,000,000,000 (in case this value fits in the unsigned integer). RETURN VALUES
When the signal has successfully been caught, ualarm() returns the amount of time left on the clock. NOTES
A microsecond is 0.000001 seconds. SEE ALSO
getitimer(2), setitimer(2), sigpause(2), sigvec(2), alarm(3), signal(3), sleep(3), usleep(3) HISTORY
The ualarm() function appeared in 4.3BSD. BSD
April 19, 1994 BSD
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