Any awk program has 3 parts, all of which are optional:
The program part marked "BEGIN" is executed before the first line is read. The part marked "END" is executed after the last line is read. The (unnamed) part in the middle is executed for every line of the input file.
Most times the part in the middle consists of rules which specify a certain pattern of lines along with one or more actions specifying what to do with these. Such a rule could be:
This means: whenever a line starts with "ABC" ("^" means "line start") increment a variable named "number". Put in the END-part a statement printing this variable and you have a counter for a certain sort of lines (before you ask: yes, "grep -c" would do the same).
I suggest Dale Doughertys "sed & awk" from O'Reilly if i managed to peak your interest.
Hello Friends,
I am new to the scripting & have to analyze bunch of regular production scripts. It has .ksh which calls on the .awk script having many functions
I need to understand and debug the scripts ASAP
Can anybody please let me know as how can I debug, I want to see the flow of code... (3 Replies)
Hi Guys,
I was recently come across some code to hopefully learn a little bit about putting Shell commands into PHP application to run on a Linux server. However, I don't understand the command AT ALL... and was wondering if anyone can interpret it:
cat userIDs.dat | awk '{s=s+1; if... (1 Reply)
Hi
I have an awk script running in ksh in which a section of code is picking out the datetime as follows:
dia=`echo $starttime | nawk '{ printf "%02d\n", substr($1,9,2)}'`
mes=`echo $starttime | nawk '{ printf "%02d\n", substr($1,6,2)}'`
ano=`echo $starttime | nawk '{ printf "%02d\n",... (3 Replies)
i am analyzing a query written by another developer ,need to understand part of script
am looking at a code ..and it converts comma files to pipe delimited and also takes away quotes from any columns,
source field format: 2510,"Debbie",NewYork
changes to
target: 2510|Debbie|NewYork
... (1 Reply)
Hey all,
So I have an AWK command here
awk '{if(FNR==NR) {arr++;next} if($0 in arr) { arr--; if (arr == 0) delete arr;next}{print $0 >"list2output.csv"}} END {for(i in arr){print i >"list1output.csv"}}' list1 list2
(refer to image for a more readable format)
This code was submitted... (1 Reply)
Hi,
Could somebody help me in understanding the following awk expression:
awk -v n="POINT" '/%/{print $0 "\n" n ;next}1' < file name
Thanks,
Arun (6 Replies)
Hi,
I found this in a script and I would like to know how this works
Code is here:
# var1=PART1_PART2
# var2=${var1##*_}
# echo $var2
PART2
I'm wondering how ##* makes the Shell to understand to pick up the last value from the given. (2 Replies)
Hi Experts,
I was looking at the below link, for finding words next to it, And unable to understand this syntax:
Can any one please explain , what is meaning of this code:
if ( F )
s = s ? s OFS $i : $i
from:... (4 Replies)
Hello
I am working on a Change request and Stuck at a point. The below awk command is used in the function.
float_test ( ) {
echo | awk 'END { exit ( !( '"$1"')); }'
}
I understand that awk 'END' is used to add one line at the end and exit is used to end the script with an error... (4 Replies)
Heyas
Recently i wanted to help someone with an awk script, but the end-script didnt work as expected.
He wanted, if HOME was empty, to get the HOME of the current USER from /etc/passwd.
At first i tried hardcoded with root:
awk -F: '/^root/ {print $6}' /etc/passwd
As that worked, i've... (4 Replies)
Discussion started by: sea
4 Replies
LEARN ABOUT DEBIAN
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).
Free Software Foundation Nov 3 1999 IGAWK(1)