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Top Forums Shell Programming and Scripting Average of a column in multiple files Post 302704467 by radoulov on Friday 21st of September 2012 03:59:08 PM
Old 09-21-2012
Code:
awk 'END { print sum / fnr > fn }
NR > 1 && FNR == 1 {
  print sum/fnr > fn
  close(fn)
  sum = x
  }
{ 
  sum += $5 
  fnr = FNR
  fn = "avg_" FILENAME
  }' stat.*

With GNU awk in most cases you don't need to bother with closing the output files.
 

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explain_stat_or_die(3)					     Library Functions Manual					    explain_stat_or_die(3)

NAME
explain_stat_or_die - get file status and report errors SYNOPSIS
#include <libexplain/stat.h> void explain_stat_or_die(const char *pathname, struct stat *buf); DESCRIPTION
The explain_stat_or_die function is used to call the stat(2) system call. On failure an explanation will be printed to stderr, obtained from explain_stat(3), and then the process terminates by calling exit(EXIT_FAILURE). This function is intended to be used in a fashion similar to the following example: explain_stat_or_die(pathname, buf); pathname The pathname, exactly as to be passed to the stat(2) system call. buf The buf, exactly as to be passed to the stat(2) system call. Returns: This function only returns on success. On failure, prints an explanation and exits. SEE ALSO
stat(2) get file status explain_stat(3) explain stat(2) errors exit(2) terminate the calling process COPYRIGHT
libexplain version 0.52 Copyright (C) 2008 Peter Miller explain_stat_or_die(3)
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