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Top Forums Shell Programming and Scripting Line number based manipulation Post 302615061 by jamie_123 on Thursday 29th of March 2012 06:42:33 AM
Old 03-29-2012
Line number based manipulation

Hi
I have a case where I am grabbing patterns and subsequent lines using

Code:
sed -n -e '/regex/{$!N;p;}'

This returns just the regex line when it is the last line of my file.

Now I may have even number of lines in some cases (regex never at end) and odd in very rare cases.

If the line count is odd, then I want to append to this a line from another file.

How do I do this? I dont know how to refer to another file within a awk file processing on someother file.

Moderator's Comments:
Mod Comment Please use code tags!

Last edited by zaxxon; 03-29-2012 at 07:50 AM.. Reason: code tags, see PM
 

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RE_COMP(3)						     Linux Programmer's Manual							RE_COMP(3)

NAME
re_comp, re_exec - BSD regex functions SYNOPSIS
#define _REGEX_RE_COMP #include <sys/types.h> #include <regex.h> char *re_comp(char *regex); int re_exec(char *string); DESCRIPTION
re_comp() is used to compile the null-terminated regular expression pointed to by regex. The compiled pattern occupies a static area, the pattern buffer, which is overwritten by subsequent use of re_comp(). If regex is NULL, no operation is performed and the pattern buffer's contents are not altered. re_exec() is used to assess whether the null-terminated string pointed to by string matches the previously compiled regex. RETURN VALUE
re_comp() returns NULL on successful compilation of regex otherwise it returns a pointer to an appropriate error message. re_exec() returns 1 for a successful match, zero for failure. CONFORMING TO
4.3BSD. NOTES
These functions are obsolete; the functions documented in regcomp(3) should be used instead. SEE ALSO
regcomp(3), regex(7), GNU regex manual COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
1995-07-14 RE_COMP(3)
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