12-18-2009
Hi Patrick.
Quote:
Originally Posted by
patrick87
Hi scottn,
Thanks for your reminding
Can I ask you what is the meaning of "?" and "A[$1]:$0"?
It's really just shorthand for an if-then-else statement. Search for "The Conditional Statement" here
---------- Post updated at 05:24 AM ---------- Previous update was at 05:17 AM ----------
Quote:
Originally Posted by
patrick87
Can I ask you how we can determine to use awk, nawk, or gawk?
I use awk because it is generally a copy of or link to nawk or gawk, so I don't need to know or think about which one is installed.
i.e. On AIX it's a link to nawk, on Linux awk and nawk are probably both linked to gawk.
The only exception is on Solaris, where you should use nawk, /usr/xpg4/bin/awk or gawk (if it's available) instead of /usr/bin/awk.
_ is just a cool name to use for a variable :-)
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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)