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Full Discussion: Delete lines between two patterns excluding the other lines containing these pattern
Top Forums UNIX for Beginners Questions & Answers Delete lines between two patterns excluding the other lines containing these pattern Post 303044656 by nezabudka on Saturday 29th of February 2020 01:36:38 AM
Old 02-29-2020
I am glad if it was useful, @jiam912
The code has grown a bit, but I could not find another way to get around the buffer size limit
Code:
sed -r ':1;N;/a[^\n]*\n*$/b1;l;s/(^a.*$)\n+(^c.*$)/\1\n\2/m'

The problem was as follows.
If the string starting with 'a' was even line then the code did not work properly.
Add the 'l' command to look at the contents of the buffer (the line marked at the end with a dollar sign)
and add one line to the input file.
Code:
cat file
aaa 409
bbb 201

122 0.98
aaa 1.47
aaa 0.00
aaa 0.00
aaa 1.47

ccc 0.00
121 0.01
135 1.99

Code:
sed -r ':1;N;/\n$/b1;l;s/(^a.*$)\n+(^c.*$)/\1\n\2/m' file
aaa 409\nbbb 201$
aaa 409 
bbb 201 
\n122 0.98$

122 0.98
aaa 1.47\naaa 0.00$
aaa 1.47
aaa 0.00
aaa 0.00\naaa 1.47$
aaa 0.00
aaa 1.47
\nccc 0.00$

ccc 0.00
121 0.01\n135 1.99$
121 0.01
135 1.99

а new version
Code:
sed -r ':1;N;/a[^\n]*\n*$/b1;l;s/(^a.*$)\n+(^c.*$)/\1\n\2/m' file
aaa 409\nbbb 201$
aaa 409 
bbb 201 
\n122 0.98$

122 0.98
aaa 1.47\naaa 0.00\naaa 0.00\naaa 1.47\n\nccc 0.00$
aaa 1.47
aaa 0.00
aaa 0.00
aaa 1.47
ccc 0.00
121 0.01\n135 1.99$
121 0.01
135 1.99

Last edited by nezabudka; 02-29-2020 at 02:52 AM..
 

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LEARN ABOUT BSD

bm

BM(PUBLIC)																BM(PUBLIC)

NAME

       bm - search a file for a string

SYNOPSIS

       /usr/public/bm [ option ] ...  [ strings ] [ file ]

DESCRIPTION

       Bm searches the input files (standard input default) for lines matching a string.  Normally, each line found is copied to the standard out-
       put.  It is blindingly fast.  Bm strings are fixed sequences of characters: there are no wildcards, repetitions, or other features of regu-
       lar expressions.  Bm is also case sensitive.  The following options are recognized.

       -x     (Exact) only lines matched in their entirety are printed

       -l     The names of files with matching lines are listed (once) separated by newlines.

       -c     Only a count of the number of matches is printed

       -e string
	      The string is the next argument after the -e flag. This allows strings beginning with '-'.

       -h     No filenames are printed, even if multiple files are searched.

       -n     Each line is preceded by the number of characters from the beginning of the file to the match.

       -s     Silent mode.  Nothing is printed (except error messages).  This is useful for checking the error status.

       -f file
	      The string list is taken from the file.

       Unless the -h option is specified the file name is shown if there is more than one input file.  Care should be taken when using the charac-
       ters $ * [ ^ | ( ) and  in the strings (listed on the command line) as they are also meaningful to the Shell.  It is safest to enclose the
       entire expression argument in single quotes ' '.

       Bm searches for lines that contain one of the (newline-separated) strings, using the Boyer-Moore algorithm.  It is far superior in terms of
       speed to the grep (egrep, fgrep) family of pattern matchers for fixed-pattern searching, and its speed increases with pattern length.

SEE ALSO

       grep(1)

DIAGNOSTICS

       Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.

AUTHOR

       Peter Bain (pdbain@wateng), with modifications suggested by John Gilmore

BUGS

       Only 100 patterns are allowed.

       Patterns may not contain newlines.

       If a line (delimited by newlines, and the beginning and end of the file) is longer than 8000 charcters (e.g. in a core dump), it  will  not
       be completely printed.

       If multiple patterns are specified, the order of the ouput lines is not necessarily the same as the order of the input lines.

       A line will be printed once for each different string on that line.

       The algorithm cannot count lines.

       The -n and -c work differently from fgrep.

       The -v, -i, and -b are not available.

4th Berkeley Distribution					    8 July 1985 							BM(PUBLIC)
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