problem in assigning substr to a variable inside awk


Login or Register for Dates, Times and to Reply

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting problem in assigning substr to a variable inside awk
# 1  
Java problem in assigning substr to a variable inside awk

Hi All,

I have a fixed-width datafile from which i need to extract value/string starting from some position to the specified length in each of the lines.

awk '{print substr($0,x,y)}' datafile --- is working fine

but

awk 'BEGIN{a=0}{a=substr($0,x,y);print $a}' datafile ---is giving unexpected resultsSmilie

Is there any limitation in using substr() in awk?

Also why can't we use ${str:x:y} instead of substr? If yes let me know how.

This is my first post in this forum.
Thanks in advance.
# 2  
Quote:
Originally Posted by loggedin.ksh
Also why can't we use ${str:x:y} instead of substr? If yes let me know how.
Because it'shell, not awk syntax.
This should provide the same result (after replaceing x, y by their numeric equivalents (NB: index start at 0):
Code:
while read; do echo "${REPLY:x:y}"; done < datafile

$REPLY is the default content of read if no variable name is given.
# 3  
Also use: print a instead of print $a inside awk..
This User Gave Thanks to Scrutinizer For This Post:
# 4  
Now i'm able to get valid results.
Thanks for your immediate replies.Smilie
Login or Register for Dates, Times and to Reply

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #662
Difficulty: Easy
The drives in DOS are referred to by identifying integers.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Assigning output from awk to variable

I have a script whose contents are as below result= awk 's=100 END {print s }' echo "The result is" $result The desired output is The result is 100 My script is running without exiting and i am also not getting the desired output. Please help (5 Replies)
Discussion started by: bk_12345
5 Replies

2. Shell Programming and Scripting

problem in assigning value to variable have value fo other variable

my script is some thing like this i11="{1,2,3,4,5,6,7,8,9,10,11,}" echo "enter value" read value ..............suppose i11 x="$value" echo "$($value)" .............the echo should be {1,2,3,4,5,6,7,8,9,10,11,} but its showing "i11" only. plz help me out to get desired... (10 Replies)
Discussion started by: sagar_1986
10 Replies

3. Shell Programming and Scripting

Assigning a value to variable through awk

I am trying to assign a value to a variable thru awk and I am having a lot of problem with it. Pls see the code snippet. The one in RED is the actual code. Other lines are the op created by the system. As you can see from the data, I was expecting an output of DG010 SDS FILE for FILE_NAME... (6 Replies)
Discussion started by: vskr72
6 Replies

4. Shell Programming and Scripting

Problem using variable inside awk

HI, This is the code I am using: awk -v aaa="connect" 'BEGIN {IGNORECASE} /aaa/,/!/ {print NR}' bb This does not throw any error but it does not work. Pls help Thanks. (4 Replies)
Discussion started by: sudvishw
4 Replies

5. UNIX for Advanced & Expert Users

couting occurences of a character inside a string and assigning it to a variable

echo "hello123" | tr -dc '' | wc -c using this command i can count the no of times a number from 0-9 occurs in the string "hello123" but how do i save this result inside a variable? if i do x= echo "hello123" | tr -dc '' | wc -c that does not work...plz suggest..thanks (3 Replies)
Discussion started by: arindamlive
3 Replies

6. Shell Programming and Scripting

problem in assigning variable

suppose in my script i have written a1=2 a2=4 read option # I directly want to see the value of a1 or a2 (i:e; 1 or2 )depending upon i/p given like a1 or a2 to option var.so what should i give .Suppose if I give a1 to option then how can I see the value. echo $$option --- doesn't work pls... (3 Replies)
Discussion started by: maitree
3 Replies

7. Shell Programming and Scripting

Assigning Variable to AWK statement

Hi, The following command runs on in the Korn shell prompt. however i want to output the value of this to a variable. Can anyone provide a solution? echo 'ABC,DEF,"G,HI,J",KLM,"MNi,O"'| awk -F "\"" '{for(i=1;i<=NF;i++){if(i%2)gsub("\,","~^~",$i)}}1' (2 Replies)
Discussion started by: ladarlsan
2 Replies

8. Shell Programming and Scripting

Problem with assigning output of grep + awk to a variable

Hi All, I am getting the output for the following command when i run it on the unix console. --------------------------- grep `whoami` /etc/passwd | awk '{print ($1);}' | cut -d ":" -f3 ---------------------------- But i made it into a script and tried to print the variable, its... (5 Replies)
Discussion started by: meheretoknow
5 Replies

9. Shell Programming and Scripting

problem assigning values to variable

Date of Request: 20080514 10:37 Submitted By: JPCHIANG i want to get the value "JPCHIANG" only in read a file, however, when i do this: name=`"$line"|cut -d " " -f8` it display all the line and append 'not found' at the end of the statement the $line is actually a variable in a... (2 Replies)
Discussion started by: finalight
2 Replies

10. UNIX for Dummies Questions & Answers

awk substr and variable for next n characters?

Here is my code let x=10 #or any other calculated value done here `echo $sol | awk '{print substr($0,1,(x-3))}'` Question. I am able to use the variable x in beginning at character "1" but I get nothing when using it for the next n characters. Should I be able to... (1 Reply)
Discussion started by: smacleod
1 Replies

Featured Tech Videos