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Full Discussion: Extract some characters from lines based on pattern
Top Forums UNIX for Beginners Questions & Answers Extract some characters from lines based on pattern Post 302997604 by bakunin on Wednesday 17th of May 2017 08:19:40 AM
Old 05-17-2017
Is the format of the lines fixed? (That is, will "{1:F" and "{2:I" always appear at a certain column?) If so, you won't even need to search for it.

First, you won't need grep because sed can do everything grep can do too:

Code:
sed -n '/{1:F/p' /your/file

If you need "{1:F" to appear on a certain column, modify the line like this:

Code:
sed -n '/^.\{xx\}{1:F/p' /your/file

where the red "xx" is a number representing the number of characters befor the search string.

In the same way you output the characters in question via a so-called "back-reference":

Code:
sed -n '/^.\{xx\}{1:F/ s/^\(.\{yy\}{2:I\)\(...\).*/\2/p;' /your/file

Again, enter sensible integer values for the "xx" and "yy" marked red.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
mad man
 

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LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
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