09-17-2014
Invoking a utility (such as
awk or
date) that is not a built-in in the shell is a relatively expensive operation. If you invoke a utility like once for every file in a directory when it only needs to be invoked once or if you invoke two utilities when only one is needed, your script will be relatively inefficient and slow. Instead of invoking
awk and
date once for every log file in the directory, would it be possible to:
- invoke awk just once:
- giving it $date_30_days as a variable,
- feeding each log file name to it as one line to be read from standard input,
- having awk convert the string form of the file's date to a numeric string instead of invoking the date utility to perform that conversion,
- lelting your awk script do the date comparisons as well as changing the date format, and
- just printing the names of the files that need to be moved?
- letting your shell script read the output from the above awk script and performing the moves for the filenames awk prints, and
- only printing NO OLD FILES if the awk script does not return the names of any files to move?
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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)