Sponsored Content
Full Discussion: Explanation of NAWK Code
Top Forums UNIX for Dummies Questions & Answers Explanation of NAWK Code Post 302466075 by jim mcnamara on Monday 25th of October 2010 10:40:52 AM
Old 10-25-2010
-F '%' - this defines % as the primary field separator.

split($1, a, " ") - using field $1 (field #1 ) create an array that is split up using space(s) as the separator, creating subfields out of $1.

print the 3rd and 4th subfield of $1, print the "%" character, then primary field #2.

If you are doing sysadmin work you have to know shell and awk. Period.

Seriously consider getting a copy of Dougherty & Robbins 'sed & awk' - you can get an ebook for a lot less than paper.
This User Gave Thanks to jim mcnamara For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Need explanation for the syntax(code)

Hi I am new to shell script programming... want to know the process of the following: if then echo "$0: missing argument for option(s) :$MISSINGOPTARG" echo "usage" $USAGE" exit 1 fi (1 Reply)
Discussion started by: chandhar
1 Replies

2. Shell Programming and Scripting

AWK deifnition and some small code explanation

Could someone give me a quick simple explanation for the AWK command. And also help me to explain the code i have made. I have made some general comments about it myself. I was wondering if people could help me with the rest: awk -F'' 'END { fmt = "%-20s\t%s\t%s\n" ... (0 Replies)
Discussion started by: amatuer_lee_3
0 Replies

3. Shell Programming and Scripting

nawk code explanation

Hi I have a line/command which greps certain pattern () from the file and 22 lines AFTER that: nawk '/\/{c=22}c&&c--' input_file Can somebody explain the coding in this command (what " c&&c-- " does)? and how to modify this command to output 22 lines BEFORE this pattern () Thanks a lot ... (3 Replies)
Discussion started by: aoussenko
3 Replies

4. Homework & Coursework Questions

Please help with the following fork code..with complete explanation

I have the following piece of codes. Please explain it to me in great detail how are these codes working. 1. #include <stdio.h> int main(){ int x; x=0; while (x<2 && fork()){ if (!fork()) execlp("echo","x++","x",0); x++; system("echo x+x"); } } 2. #include <stdio.h> int i;... (1 Reply)
Discussion started by: prakashabii
1 Replies

5. Shell Programming and Scripting

code explanation

Can you please explain the following code plz? my_cd=' ' while getopts :e: OPTION; do case "$OPTION" in e) my_cd ="$OPTARG";; esac done if ; then echo " >>> ERROR - I am wrong" echo " >>> ERROR - Hello" exit 99 fi What I don't understand is what is OPTION or... (3 Replies)
Discussion started by: RubinPat
3 Replies

6. UNIX for Dummies Questions & Answers

Code explanation?

I need someone to tell me how exactly works the following code αfter /etc/passwd :eek:: cat /etc/passwd|grep "^:"|sed '1,$s/^\(*\):*:\(*\):.*$/ \1 \2 /'|sort -nrk3 -t:I want a good explanation to understand the code please (4 Replies)
Discussion started by: kotsos13
4 Replies

7. Homework & Coursework Questions

Minix 3 Source Code Organisation Explanation

1. I've been asked to provide a detailed description on how Minix's source code is organised. This may sound slightly simple, but what exactly am I to refer to when explaining? Any documents that would provide assistance to understand whats being asked? Thanks 2. Not applicable: 3.... (1 Reply)
Discussion started by: Menace12
1 Replies

8. Shell Programming and Scripting

Nawk Problem - nawk out of space in tostring on

Hi.. i am running nawk scripts on solaris system to get records of file1 not in file2 and find duplicate records in a while with the following scripts -compare nawk 'NR==FNR{a++;next;} !a {print"line"FNR $0}' file1 file2duplicate - nawk '{a++}END{for(i in a){if(a-1)print i,a}}' file1in the middle... (12 Replies)
Discussion started by: Abhiraj Singh
12 Replies

9. Shell Programming and Scripting

ksh code explanation

Hi. Can somebody please explain the following lines of KSH code for me? The code checks all sub directories in a specific location which are numbered (E.g. test_01, test_02 ... etc.), then finds the one with highest number and extracts that number from the dir name into the variable num. I'd just... (9 Replies)
Discussion started by: user052009
9 Replies

10. UNIX for Beginners Questions & Answers

Explanation of Nawk command

Hi Folks, I am struggling to understand nawk command which was used by another developer. Can you please explain what each character or string is doing here below: if ; then (3 Replies)
Discussion started by: kirans.229
3 Replies
FAXCRON(8)						      System Manager's Manual							FAXCRON(8)

NAME
faxcron - HylaFAX routine maintenance script SYNOPSIS
/usr/sbin/faxcron [ -n ] [ -l lastrun ] DESCRIPTION
faxcron is a command script that does routine upkeep tasks in a HylaFAX spooling directory hierarchy. This script is intended to be invoked from cron(8) on behalf of the fax user (often the ``fax'' user is uucp) once a day, with the standard output sent by mail to the HylaFAX administrator. For example, the following crontab might be set up for the fax user: 25 23 * * * sh /usr/sbin/faxcron | mail FaxMaster The faxcron script does the following work: o report statistics for facsimile transmitted since the last time faxcron was run. o report statistics for facsimile transmitted in the past week. o report statistics for facsimile received since the last time faxcron was run. o report statistics for facsimile received in the past week. o report any recent calls that failed suspiciously and return the associated trace log; o purge data that is 30 days or older from the remote machine information directory; o delete information that is 30 days or older from session trace log files; o remove files from the tmp directory that are older than 1 day; o remove files in the received facsimile queue that are 7 days or older; o report sites that are currently having jobs rejected; and o force all session log files to be owned by the fax user and kept with protection mode 644. OPTIONS
-n Forces faxcron to run without updating any files. -l lastrun Forces the notion of the last time that faxcron was run to be lastrun. The value of lastrun is a date and time string of the form ``MM/DD/YY HH:MM'' (the date(1) format string ``%D %H:%M''). -info n Set the expiration time for data in the info database to be n days. -log n Set the expiration time for session log data to be n days. -rcv n Set the expiration time for files in the received facsimile queue to be n days. -tmp n Set the expiration time for files in the tmp directory to be n days. -mode m Set the file protection mode for session logs to m (a command line argument to chmod(1)). NOTES
This script requires nawk(1) or gawk(1) and a date (1) program that supports the ``+format'' option. If session logs are to be kept private this script must be modified to filter out sensitive information such as calling card numbers. (It should also be run with ``-mode 0600'' so that session log files are not publicly readable.) FILES
/var/spool/hylafax spooling area /var/spool/hylafax/status/lastrun timestamp of last run /usr/sbin/xferfaxstats for generating transmit statistics /usr/sbin/recvstats for generating receive statistics /var/spool/hylafax/tmp/faxcronXXXX temporary file for truncating session logs /var/spool/hylafax/tmp/faxlogXXXX temporary file for logs of failed calls SEE ALSO
cron(8), faxq(8), faxgetty(8), faxsend(8), xferfaxstats(8), recvstats(8), hylafax-server(5) May 12, 1996 FAXCRON(8)
All times are GMT -4. The time now is 02:48 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy