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Full Discussion: Insert new pattern in newline after the nth occurrence of a line pattern - Bash in Ubuntu 12.04
Top Forums Shell Programming and Scripting Insert new pattern in newline after the nth occurrence of a line pattern - Bash in Ubuntu 12.04 Post 302700191 by Phil3759 on Thursday 13th of September 2012 05:42:00 AM
Old 09-13-2012
Insert new pattern in newline after the nth occurrence of a line pattern - Bash in Ubuntu 12.04
Hi,

I am getting crazy after days on looking at it:
Bash in Ubuntu 12.04.1

I want to do this:
pattern="system /path1/file1 file1"
new_pattern=" data /path2/file2 file2"
file to edit: data.db

- I need to search in the file data.db for the nth occurrence of pattern
- pattern must match a complete line
- insert after pattern a new line with new_pattern

Sed in my installed Ubuntu does not seem to accept /c or /a commands, only -i !!

So, I tried this:
Code:
sed "s%system /path1/file1 file1%&\n    data /path2/file2 file2%" -i data.db

Which works except:
1- all occurrences of pattern will be replaced in data.db, not only the nth one
2- pattern will be matched even if it is not ending with a new line

So, tried to add \n at end of pattern to fix issue 2:
Code:
sed "s%system /path1/file1 file1\n%&\n    data /path2/file2 file2%" -i data.db

Result is pattern will not be replaced at all

and to fix issue 1, I tried the following with and without the -i:
Code:
sed "0,%system /path1/file1 file1%s%system /path1/file1 file1%&\n    data /path2/file2 file2%" [-i] data.db

No output error, but pattern is not matched

Any help please even if it is with another command
Difficulty seems to be caused by the / and spaces in my patterns!
 

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LEARN ABOUT LINUX

xzdiff

XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME

       xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files

SYNOPSIS

       xzcmp [cmp_options] file1 [file2]
       xzdiff [diff_options] file1 [file2]
       lzcmp [cmp_options] file1 [file2]
       lzdiff [diff_options] file1 [file2]

DESCRIPTION

       xzcmp  and xzdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options specified are passed
       directly to cmp(1) or diff(1).  If only one file is specified, then the files compared are file1 (which must have a suffix of  a  supported
       compression format) and file1 from which the compression format suffix has been stripped.  If two files are specified, then they are uncom-
       pressed if necessary and fed to cmp(1) or diff(1).  The exit status from cmp(1) or diff(1) is preserved.

       The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils.

SEE ALSO

       cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1)

BUGS

       Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified.

Tukaani 							    2010-09-27								 XZDIFF(1)
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