Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Shell Variables passed to awk to return certain rows
Top Forums Shell Programming and Scripting Shell Variables passed to awk to return certain rows Post 302948462 by Don Cragun on Monday 29th of June 2015 07:53:16 PM
Old 06-29-2015
You need a -v option for each variable you're setting; not just the first one.

If there is any chance that string_to_search could contain any whitespace characters or characters that have special meaning to the shell, it will also need to be quoted.

It is generally a good idea to quote all shell variable expansions, but I will assume for now that your script has already verified that $search_col_pos and $search_str_len expand to numeric strings.

And, inside an awk script, putting a variable name in quotes will try to match against the name of the variable instead of the contents of the variable.

Try:
Code:
awk -v search_col_pos=$search_col_pos -v search_str_len=$search_str_len -v string_to_search="$string_to_search" 'substr($0, search_col_pos, search_str_len) == string_to_search' test.txt

If that still doesn't work, show us what happens with the above corrections.
Last edited by Don Cragun; 06-29-2015 at 08:55 PM.. Reason: Fix typos.
This User Gave Thanks to Don Cragun For This Post:
pchang
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Using shell variables In awk

Oh its not my day for syntax... cat gzipsize.txt | awk '{print "echo",$1,$2} > master.txt I have read a lot about the awk -v but haven't been able to get it to work. I have a variable in my script and I'm looking just to push it into the awk after the $2 (or anywhere would do)!!! Every... (11 Replies)
Discussion started by: nortypig
11 Replies

2. Shell Programming and Scripting

Awk, shell variables

Hello, I've been trying to figure out how to use variables inside the AWK command and use it back in the korn shell sript. in my script I have lots of awk commands like this grep Listen /etc/ssh/sshd_config | \ awk '{ if ($2 == "22" ) print "OK"; else print "not OK" }' ... (3 Replies)
Discussion started by: mirusko
3 Replies

3. Shell Programming and Scripting

Return Awk Variable to Shell

I'm a bit stuck in getting variable from awk to shell. I tried searching but most of them showing to assign to shell variable via.. VAR=`echo $line | awk -F: '{print $1}'` which is correct ofcourse My problem is multiple assignments of variable like this one. The above solution will give... (10 Replies)
Discussion started by: ryandegreat25
10 Replies

4. Shell Programming and Scripting

AWK: Retrieving names of variables passed with -v

I'm an experienced awk user, but this one has me stumped. I have an awk script which is called from a UNIX command line as you'd expect: myscript.awk -v foo=$1 -v bar=$2 filename My question is this: is there a mechanism for determining the names of the -v variables within a script? ... (3 Replies)
Discussion started by: John Mac
3 Replies

5. Shell Programming and Scripting

awk - take variables out to shell

Hi, How could we take the value of awk variables out to shell? I know the following methods 1. awk '{print $1}' < file | read a echo $a 2. a=`awk '{print $1}' < file` echo $a Please let me know if there are any other methods. Also, how do we take more than 1 variable value... (4 Replies)
Discussion started by: Thumban
4 Replies

6. Shell Programming and Scripting

awk processing of passed variables

Currently have this: set current=192.168.0.5 set servicehost = `echo $current | awk -F. '{print $4}'` echo $numberoffields 5 ..but would like to reduce # of variables and eliminate echo to have something like this: set servicehost = `awk -v s="$current" -F. 'BEGIN{print $2}'`But... (3 Replies)
Discussion started by: Mid Ocean
3 Replies

7. Shell Programming and Scripting

awk - Why can't value of awk variables be passed to external functions ?

I wrote a very simple script to understand how to call user-defined functions from within awk after reading this post. function my_func_local { echo "In func $1" } export -f my_func_local echo $1 | awk -F"/" '{for (k=1;k<=NF;k++) { if ($k == "a" ) { system("my_local_func $k") } else{... (19 Replies)
Discussion started by: sreyan32
19 Replies

8. Shell Programming and Scripting

Multiple bash variables passed into nawk

I have a file that has 2 fields called b_file: 11977 DAR.V3.20150209.1.CSV 3295 DAR.V3.20150209.1.CSV 1721 DAR.V2.20150210.1.CSV I need to search a sftplog using the field 1, but want to maintain the relationship between field 1 and 2. I am passing field 1 as a parameter in a bash loop. ... (14 Replies)
Discussion started by: smenago
14 Replies

9. UNIX for Dummies Questions & Answers

Multiple variables to be passed in a loop

Hi, I need to pass the multiple values of src1 to another variable. I managed to print it but not sure how to assign it to a variable in a loop. src1=01,02,03 echo $src1|awk 'BEGIN {FS=","} {for(i=1;i<=NF;i++) print $i}' I need to pass the value as src2=01 src2=02 src2=03 Thanks... (4 Replies)
Discussion started by: shash
4 Replies

10. Shell Programming and Scripting

Shell script to create runtime variables based on the number of parameters passed in the script

Hi All, I have a script which intends to create as many variables at runtime, as the number of parameters passed to it. The script needs to save these parameter values in the variables created and print them abc.sh ---------- export Numbr_Parms=$# export a=1 while do export... (3 Replies)
Discussion started by: dev.devil.1983
3 Replies

LEARN ABOUT NETBSD

field_info

FORMS(3)						   BSD Library Functions Manual 						  FORMS(3)

NAME

     dynamic_field_info, field_info -- form library

LIBRARY

     Curses Form Library (libform, -lform)

SYNOPSIS

     #include <form.h>

     int
     dynamic_field_info(FIELD *field, int *drows, int *dcols, int *max);

     int
     field_info(FIELD *field, int *rows, int *cols, int *frow, int *fcol, int *nrow, int *nbuf);

DESCRIPTION

     The function dynamic_field_info() returns the sizing information for the field given.  The function will return the number of rows, columns
     and the maximum growth of the field in the storage pointed to by the drows, dcols and max parameters respectively.  Dynamic field information
     cannot be requested for the default field.  If the field given is not dynamic then dynamic_field_info() will simply return the size of the
     actual field.  The field_info() will return the number or rows, columns, field starting row, field starting column, number of off screen rows
     and number of buffers in rows, cols, frow, fcol, nrow and nbuf respectively.

RETURN VALUES

     The functions will return one of the following error values:

     E_OK		The function was successful.
     E_BAD_ARGUMENT	A bad argument was passed to the function.

SEE ALSO

     curses(3), forms(3)

NOTES

     The header <form.h> automatically includes both <curses.h> and <eti.h>.

BSD
								  January 1, 2001							       BSD
All times are GMT -4. The time now is 04:32 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy