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Shell Programming and Scripting
How to get this script work on multiple input files
Post 302448594 by kevintse on Thursday 26th of August 2010 11:38:00 AM
08-26-2010
Quote:
Looks good! I am just wondering where the 3 is coming from (is the value rounded?). In the example the highest value is 0.34913E+01 for $2.
And another question just for my understanding. Where is specified that with starting to read a new file variable h is reset to 0 in order to extract the highest value of this specific file?
I try to grasp as much as possible that is why I ask so much
Cheers,
Daniel
Edit:
O maybe I got it! Right after begin you set h=0.
Edit2:
Oh now I got it, printf "%s\n%d\n" gives me header as a string and h as decimal expression and thus 3
And another question just for my understanding. Where is specified that with starting to read a new file variable h is reset to 0 in order to extract the highest value of this specific file?
I try to grasp as much as possible that is why I ask so much
Cheers,
Daniel
Edit:
O maybe I got it! Right after begin you set h=0.
Edit2:
Oh now I got it, printf "%s\n%d\n" gives me header as a string and h as decimal expression and thus 3
"BEGIN { h=0 }" initializes h(highest value) to zero so it can be used to compare with all $2 in the file.
And, actually, you can use printf "%e", number to print numbers in exponential format, and printf "%f", number in float point.
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LEARN ABOUT NETBSD
seq
SEQ(1) BSD General Commands Manual SEQ(1) NAME
seq -- print sequences of numbers SYNOPSIS
seq [-w] [-f format] [-s string] [-t string] [first [incr]] last DESCRIPTION
The seq utility prints a sequence of numbers, one per line (default), from first (default 1), to near last as possible, in increments of incr (default 1). When first is larger than last the default incr is -1. All numbers are interpreted as floating point. Normally integer values are printed as decimal integers. The seq utility accepts the following options: -f format Use a printf(3) style format to print each number. Only the A, a, E, e, F, f, G, g, and % conversion characters are valid, along with any optional flags and an optional numeric mimimum field width or precision. The format can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). The default is %g. -s string Use string to separate numbers. The string can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). The default is . -t string Use string to terminate sequence of numbers. The string can contain character escape sequences in backslash notation as defined in ANSI X3.159-1989 (``ANSI C89''). This option is useful when the default separator does not contain a . -w Equalize the widths of all numbers by padding with zeros as necessary. This option has no effect with the -f option. If any sequence numbers will be printed in exponential notation, the default conversion is changed to %e. The seq utility exits 0 on success and non-zero if an error occurs. EXAMPLES
# seq 1 3 1 2 3 # seq 3 1 3 2 1 # seq -w 0 .05 .1 0.00 0.05 0.10 SEE ALSO
jot(1), printf(1), printf(3) HISTORY
The seq command first appeared in Plan 9 from Bell Labs. A seq command appeared in NetBSD 3.0. This command was based on the command of the same name in Plan 9 from Bell Labs and the GNU core utilities. The GNU seq command first appeared in the 1.13 shell utilities release. BUGS
The -w option does not handle the transition from pure floating point to exponent representation very well. The seq command is not bug for bug compatible with the Plan 9 from Bell Labs or GNU versions of seq. BSD
May 27, 2010 BSD