05-07-2009
You're not clear what this is for...
Are you talking about a command line utility? Or are you talking about a C program?
A simple awk script could do this if you're just validating an input file before doing something else.
I'm not the world's greatest authority on awk, as i tend to think of processing lines like I would in C, but this might help you.
#!/bin/awk
{ last=$1
for (i=2; i<NF; i++) {
if ($i < last)
exit NR
last=$i
}
This will return an exit code matching the first wrong line, or zero if everything is OK for all lines of the input.
HTH
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IGAWK(1) Utility Commands IGAWK(1)
NAME
igawk - gawk with include files
SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ...
igawk [ all gawk options ] [ -- ] program-text file ...
DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).
AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like
@include getopt.awk
in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.
OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports.
EXAMPLES
cat << EOF > test.awk
@include getopt.awk
BEGIN {
while (getopt(ARGC, ARGV, "am:q") != -1)
...
}
EOF
igawk -f test.awk
SEE ALSO
gawk(1)
Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.
AUTHOR
Arnold Robbins (arnold@skeeve.com).
Free Software Foundation Nov 3 1999 IGAWK(1)