Visit Our UNIX and Linux User Community


Executing if dynamic conditions in awk


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Executing if dynamic conditions in awk
# 15  
Old 02-16-2020
Quote:
Originally Posted by cskumar
Thats cool rdrtx1. However anxious to see how OR condition works as below are AND conditions.

In our example the below conditions are treated as AND conditions and file got processed.
Code:
CONDITIONS="1=CT,2=US_10,3=CT_US_10"

converted to
Code:
CONDITIONS="1=CT,4=US_10,60=CT_US_10"

Can you please throw some light on how to work with AND,OR conditions together if the condition comes dynamically from user input. Below is an example.

Code:
CONDITIONS="(1=CT or 2=US_10) and 3=CT_US_10 and 4="

You could use sed (or similar) to convert your input syntax to an awk expression eg:

Code:
CONDITIONS="(1=CT or 2=US_10) and 3=CT_US_10 and 4="
CONDITIONS=$(echo "$CONDITIONS" |
   sed \
      -e 's/\([1-9][0-9]*\)=/$\1=/g' \
      -e 's/= *\([^() ]*\)\([^ ]*\)/== "\1"\2/g' \
      -e 's/ and / \&\& /g' \
      -e 's/ or / || /g' \
)

if ! awk '{if ('"$CONDITIONS"') { print } }' file
then
   echo "Illegal syntax unable to filter file"
fi

These 2 Users Gave Thanks to Chubler_XL For This Post:

Previous Thread | Next Thread
Test Your Knowledge in Computers #866
Difficulty: Easy
Lisp and Fortran are the two oldest high-level programming language still in widespread use today.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk problems - awk ignores conditions

awk 'BEGIN{ if('"$CATE"'<'"${WARN}"') printf ("%s", "'"`Kfunc "" ; break`"'") else if (('"${CATE}"'>='"${WARN}"') && ('"${CATE}"'<'"${CRIT}"')) printf ("%s", "'"`Wfunc ""; break`"'") else if ('"${CATE}"'>='"${CRIT}"') printf... (6 Replies)
Discussion started by: SkySmart
6 Replies

2. Shell Programming and Scripting

If conditions in awk

Hello Friends, I need to find some CDRs in production servers whose 1st field value and 2nd field value = 1 and 11th looks like 45.123... where there are more than 3 digits after comma.so i wrote a one liner, something like below but does not work, however when i used first and second conditions... (8 Replies)
Discussion started by: EAGL€
8 Replies

3. Shell Programming and Scripting

Shell script executing both the conditions.

I have written this script. This is used for creating a backup folder. #!/bin/sh #set -x . /home/.profile usage="Usage is $0" usage="$usage " # Use the getopt utility to set up the command line flags. set -- `/usr/bin/getopt b: $*` # Process individual command line arguments while ;... (1 Reply)
Discussion started by: arijitsaha
1 Replies

4. Shell Programming and Scripting

awk three conditions

I'm having a problem pulling UID's from data. The data outputs a user's UID in one of three ways: 1. Error User user_name already assigned with <UID> 2. Success <UID> reserved for user_name 3. <a load of crap because there was a db failure yet somehow the UID is still in there> I typically... (5 Replies)
Discussion started by: MaindotC
5 Replies

5. Shell Programming and Scripting

awk with conditions

Hi All, I have a file with below contents. "en2"/10.185.81.0:cluster_interconnect,"en5"/10.185.81.0:cluster_interconnect,"en6"/169.181.146.0:public I want to take the interface name from the file and convert it as ipaddress using ifconfig command get the output like below en6 ->... (2 Replies)
Discussion started by: kamauv234
2 Replies

6. Shell Programming and Scripting

Conditions in awk

Hi there, here is my command ssh host.local "/path/to/my/perscript/hostconfig.pl -s $HOST -d |awk '{if (\$4 > 120)print \"My error message\";exit}{s=0; for (i=1; i<=NF; i++) s++; if(s == 13) print \$3}'" The problem is if conditional 1 is met (i.e $4 > 120), i don't see "My error message", the... (5 Replies)
Discussion started by: urello
5 Replies

7. Shell Programming and Scripting

awk with two conditions

Hi Everyone, # cat 1 1;2;3;4;5;6 1;2;3;4;5; # awk -F ";" '$5 == "5"' 1 1;2;3;4;5;6 1;2;3;4;5; but the output is should be just "1;2;3;4;5;6" means 1st condition: $5 is 5; 2nd condition: $6 is not empty, please advice. Thanks (2 Replies)
Discussion started by: jimmy_y
2 Replies

8. Shell Programming and Scripting

specifying multiple conditions in AWK

how can i specify more than 1 consition in the following AWK statament?? i.e. if $2 is ABCD and $3 is MNOP and $4 is KLPM similarly for OR #!/bin/ksh awk -F '' ' $2 == "ABCD" { print $2, $3;}' file.xml (2 Replies)
Discussion started by: skyineyes
2 Replies

9. UNIX for Advanced & Expert Users

Dynamic Downloading and executing of ELF files

Dear Group, I want to prepare an ELF file which can be downloaded dynamically to any address in the moemory and executes as a new task/thread/process. 1) for this what are all the compileation, linker options while building the ELF file? 2) which parts of ELF file has to modified while... (1 Reply)
Discussion started by: ravinder.are
1 Replies

10. Shell Programming and Scripting

About awk conditions

Hello, Can you explain why in the first 2 commands the awk does not print anything? Is it looking of a specific format ? Thanks. $ echo 12a3 | awk '($1>=2) {print $1}' # prints nothing $ echo 123a | awk '($1>=2) {print $1}' # prints nothing $ echo a123 | awk '($1>=2) {print $1}' a123... (1 Reply)
Discussion started by: majormark
1 Replies

Featured Tech Videos