12-09-2003
Ygor really a expert in awk!! I viewed his posts and I still need to learn from him/her.
I know that is one of method to set variable in awk.
And I know 3 methods to do that, maybe more than 3 ways then I may not know.
Method 1:
Variable was assigned after any actions, var cannot be read in BEGIN {} because action in BEGIN {} is started before reading the script.
awk '{print $0}' var=$1 filename
Method 2:
One variable with one -v, variable can be read in BEGIN{} and the script.
awk -v var1=$1 -v var2=$2 '{print $0}' filename
Method 3:
assign variable in the script body.
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LEARN ABOUT OPENSOLARIS
igawk
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).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWgawk |
+--------------------+-----------------+
|Interface Stability | Volatile |
+--------------------+-----------------+
NOTES
Source for gawk is available on http://opensolaris.org.
Free Software Foundation Nov 3 1999 IGAWK(1)