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Top Forums UNIX for Beginners Questions & Answers sed script to delete the last word after a last pattern match Post 303033555 by RudiC on Monday 8th of April 2019 08:53:01 AM
Old 04-08-2019
May I jump in as Don seems offline for a while now?'


sed operates on files line by line, it reads a line, performs the entire script on it, and reads the next. * is not "all lines" but a sort of mutiplier for the preceding "atom" (man regex).

Code:
s		substitute command
|		regex delimiter; any char allowed, see "man sed"
/[^/]*$		regex: slash, any number (*) non-slashes ([^/]), line end
|		separates regex from replacement
|		replacement terminator, empty replacement = delete regex

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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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