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Full Discussion: Match text to lines in a file, iterate backwards until text or text substring matches, print to file
Top Forums Shell Programming and Scripting Match text to lines in a file, iterate backwards until text or text substring matches, print to file Post 303038371 by shogun1970 on Sunday 1st of September 2019 04:33:58 AM
Old 09-01-2019
Match text to lines in a file, iterate backwards until text or text substring matches, print to file
hi all,

trying this using shell/bash with sed/awk/grep

I have two files, one containing one column, the other containing multiple columns (comma delimited).

Code:
file1.txt
abc12345
def12345
ghi54321
...

Code:
file2.txt
abc1,text1,texta
abc,text2,textb
def123,text3,textc
gh,text4,textd
...

i'm trying to take each line in file1 and using the original text to match, if no match, iterate backwards one character at time, until it matches first column in file2, loop through all of file2 and print all matching lines where text and any substring matches the first column of file2 to another file. output file3 essentially will have concatenated output of original text from file1 and matching lines from file2

output example:

Code:
file3.txt
abc12345,abc1,text1,texta 
abc12345,abc,text2,textb
def12345,def123,text3,textc
ghi154321,gh,text4,textd
...

any help would be much appreciated.
 

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LEARN ABOUT DEBIAN

column

COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME

     column -- columnate lists

SYNOPSIS

     column [-entx] [-c columns] [-s sep] [file ...]

DESCRIPTION

     The column utility formats its input into multiple columns.  Rows are filled before columns.  Input is taken from file operands, or, by
     default, from the standard input.	Empty lines are ignored unless the -e option is used.

     The options are as follows:

     -c      Output is formatted for a display columns wide.

     -s      Specify a set of characters to be used to delimit columns for the -t option.

     -t      Determine the number of columns the input contains and create a table.  Columns are delimited with whitespace, by default, or with
	     the characters supplied using the -s option.  Useful for pretty-printing displays.

     -x      Fill columns before filling rows.

     -n      By default, the column command will merge multiple adjacent delimiters into a single delimiter when using the -t option; this option
	     disables that behavior. This option is a Debian GNU/Linux extension.

     -e      Do not ignore empty lines.

ENVIRONMENT

     The COLUMNS, LANG, LC_ALL and LC_CTYPE environment variables affect the execution of column as described in environ(7).

EXIT STATUS

     The column utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

	   (printf "PERM LINKS OWNER GROUP SIZE MONTH DAY " ; 
	   printf "HH:MM/YEAR NAME
" ; 
	   ls -l | sed 1d) | column -t

SEE ALSO

     colrm(1), ls(1), paste(1), sort(1)

HISTORY

     The column command appeared in 4.3BSD-Reno.

BUGS

     Input lines are limited to LINE_MAX (2048) bytes in length.

BSD
								   July 29, 2004							       BSD
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