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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)								   User Commands							    cut(1)

NAME
cut - cut out selected fields of each line of a file SYNOPSIS
cut -b list [-n] [file...] cut -c list [file...] cut -f list [-d delim] [-s] [file...] DESCRIPTION
Use the cut utility to cut out columns from a table or fields from each line of a file; in data base parlance, it implements the projection of a relation. The fields as specified by list can be fixed length, that is, character positions as on a punched card (-c option) or the length can vary from line to line and be marked with a field delimiter character like <TAB> (-f option). cut can be used as a filter. Either the -b, -c, or -f option must be specified. Use grep(1) to make horizontal ``cuts'' (by context) through a file, or paste(1) to put files together column-wise (that is, horizontally). To reorder columns in a table, use cut and paste. OPTIONS
The following options are supported: list A comma-separated or blank-character-separated list of integer field numbers (in increasing order), with optional - to indicate ranges (for instance, 1,4,7; 1-3,8; -5,10 (short for 1-5,10); or 3- (short for third through last field)). -b list The list following -b specifies byte positions (for instance, -b1-72 would pass the first 72 bytes of each line). When -b and -n are used together, list is adjusted so that no multi-byte character is split. -c list The list following -c specifies character positions (for instance, -c1-72 would pass the first 72 characters of each line). -d delim The character following -d is the field delimiter (-f option only). Default is tab. Space or other characters with special meaning to the shell must be quoted. delim can be a multi-byte character. -f list The list following -f is a list of fields assumed to be separated in the file by a delimiter character (see -d ); for instance, -f1,7 copies the first and seventh field only. Lines with no field delimiters will be passed through intact (use- ful for table subheadings), unless -s is specified. -n Do not split characters. When -b list and -n are used together, list is adjusted so that no multi-byte character is split. -s Suppresses lines with no delimiter characters in case of -f option. Unless specified, lines with no delimiters will be passed through untouched. OPERANDS
The following operands are supported: file A path name of an input file. If no file operands are specified, or if a file operand is -, the standard input will be used. USAGE
See largefile(5) for the description of the behavior of cut when encountering files greater than or equal to 2 Gbyte (2**31 bytes). EXAMPLES
Example 1: Mapping user IDs A mapping of user IDs to names follows: example% cut -d: -f1,5 /etc/passwd Example 2: Setting current login name To set name to current login name: example$ name=`who am i | cut -f1 -d' '` ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of cut: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 All input files were output successfully. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
grep(1), paste(1), attributes(5), environ(5), largefile(5), standards(5) DIAGNOSTICS
cut: -n may only be used with -b cut: -d may only be used with -f cut: -s may only be used with -f cut: cannot open <file> Either file cannot be read or does not exist. If multiple files are present, processing continues. cut: no delimiter specified Missing delim on -d option. cut: invalid delimiter cut: no list specified Missing list on -b, -c, or -f option. cut: invalid range specifier cut: too many ranges specified cut: range must be increasing cut: invalid character in range cut: internal error processing input cut: invalid multibyte character cut: unable to allocate enough memory SunOS 5.10 29 Apr 1999 cut(1)
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