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Full Discussion: awk gsub with variables
Top Forums UNIX for Dummies Questions & Answers awk gsub with variables Post 302778965 by somu_june on Monday 11th of March 2013 10:52:39 PM
Old 03-11-2013
awk gsub with variables

Hello,

I'm trying to substitute a string with leading zero for all the records except the trailer record using awk command and with variables. The input file test_med1.txt has data like below

Code:
1234ABC...........................9200............LF
456789.............................0401............LF

And I want to replace 9200 with 09200 and 0401 with 00401

Code:
1234ABC...........................09200............LF
456789.............................00401............LF

I tried below command but not successfull

Command :

Code:
a= cat test_med1.txt | awk '!/TLR/' |
  cut -c 65-84 b= `cat test_med1.txt |
  awk '!/TLR/' |
  cut -c 65-84 |
  awk '{$0=0$0;print}'`; awk -v rvar=${a} -v svar=${b} '{gsub(rvar,svar); print}' test_med1.txt

Error:
Code:
cut: 0653-132 Cannot open b=.
cut: 0653-132 Cannot open 09200.
cut: 0653-132 Cannot open 00401.
cut: 0653-132 Cannot open 07803.
cut: 0653-132 Cannot open 05400.
cut: 0653-132 Cannot open 02500.
cut: 0653-132 Cannot open 09901.
cut: 0653-132 Cannot open 00700.
awk: 0602-533 Cannot find or open file 07803.
The source line number is 1.


Please let me know where the command in failing and if it is complete wrong then let me know how to get above output using awk and gsub command


Thanks,
Somaraju

Last edited by Scott; 03-12-2013 at 12:33 AM.. Reason: You forgot to add code tags...
 

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CUT(1)							      General Commands Manual							    CUT(1)

NAME
cut - select out columns of a file SYNOPSIS
cut [ -b | -c] list [file...] cut -f list [-d delim] [ -s] OPTIONS
-b Cut specified bytes -c Select out specific characters -d Change the column delimiter to delim -f Select out specific fields that are separated by the -i Runs of delimiters count as one -s Suppres lines with no delimiter characters, when used EXAMPLES
cut -f 2 file # Extract field 2 cut -c 1-2,5 file # Extract character columns 1, 2, and 5 cut -c 1-5,7- file # Extract all columns except 6 DESCRIPTION
[file...]" delimiter character ( see delim)" with the -f option. Lines with no delimiters are passwd through untouched" Cut extracts one or more fields or columns from a file and writes them on standard output. If the -f flag is used, the fields are sepa- rated by a delimiter character, normally a tab, but can be changed using the -d flag. If the -c flag is used, specific columns can be specified. The list can be comma or BLANK separated. The -f and -c flags are mutually exclusive. Note: The POSIX1003.2 standard requires the option -b to cut out specific bytes in a file. It is intended for systems with multi byte characters (e.g. kanji), since MINIX uses only one byte characters, this option is equivalent to -c. For the same reason, the option -n has no effect and is not listed in this man- ual page. SEE ALSO
sed(1), awk(9). CUT(1)
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