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Top Forums UNIX for Dummies Questions & Answers read regex from ID file, print regex and line below from source file Post 302712153 by scottaazz on Monday 8th of October 2012 08:52:27 PM
Old 10-08-2012
Jim is correct (cool way of performing the task) but you need to switch the comparison operator in the if statement

Code:
awk 'FILENAME=="ID.txt" {arr[$0]++}
FILENAME=="source.txt" { for(i in arr) {if ($0 ~ i) {print ">", i; getline; print $0; getline; print $0  }   } }' ID.txt source.txt

 

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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 3.25 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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