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Top Forums Shell Programming and Scripting help splitting a file into multiple files in bash Post 302311801 by elinenbe on Wednesday 29th of April 2009 03:03:32 PM
Old 04-29-2009
Question help splitting a file into multiple files in bash

I have a file that logs multiple sessions. What I would like to do is split this file inclusive of the lines that include "starting session" and "shutting down" and ignore the data before and after the beginning of the first session and the end of the last session. The output files can be called whatever... session.1 session.2 ...

I am using bash.

blah blah
blah blah starting session blah blah
blah1 blah1 blah1
blah2 blah2 blah2
blah3 blah3 blah3
blah balh shutting down blah blah
blah3 blah5 starting session blah3 1blah
blah103 blah1 blah1
blah3 blah3 blah3
blah balh shutting down blah blah
blah blah


So, if I ran it against the bit above, I'd have

file1 (session.1):

blah blah starting session blah blah
blah1 blah1 blah1
blah2 blah2 blah2
blah3 blah3 blah3
blah balh shutting down blah blah

file2 (session.2):

blah3 blah5 starting session blah3 1blah
blah103 blah1 blah1
blah3 blah3 blah3
blah balh shutting down blah blah

Thanks,
Eric
 

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STRTOK(3)						   BSD Library Functions Manual 						 STRTOK(3)

NAME
strtok, strtok_r -- string tokens LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <string.h> char * strtok(char *restrict str, const char *restrict sep); char * strtok_r(char *restrict str, const char *restrict sep, char **restrict lasts); DESCRIPTION
This interface is obsoleted by strsep(3). The strtok() function is used to isolate sequential tokens in a null-terminated string, str. These tokens are separated in the string by at least one of the characters in sep. The first time that strtok() is called, str should be specified; subsequent calls, wishing to obtain further tokens from the same string, should pass a null pointer instead. The separator string, sep, must be supplied each time, and may change between calls. The implementation will behave as if no library function calls strtok(). The strtok_r() function is a reentrant version of strtok(). The context pointer last must be provided on each call. The strtok_r() function may also be used to nest two parsing loops within one another, as long as separate context pointers are used. The strtok() and strtok_r() functions return a pointer to the beginning of each subsequent token in the string, after replacing the token itself with a NUL character. When no more tokens remain, a null pointer is returned. EXAMPLES
The following uses strtok_r() to parse two strings using separate contexts: char test[80], blah[80]; char *sep = "\/:;=-"; char *word, *phrase, *brkt, *brkb; strcpy(test, "This;is.a:test:of=the/string\tokenizer-function."); for (word = strtok_r(test, sep, &brkt); word; word = strtok_r(NULL, sep, &brkt)) { strcpy(blah, "blah:blat:blab:blag"); for (phrase = strtok_r(blah, sep, &brkb); phrase; phrase = strtok_r(NULL, sep, &brkb)) { printf("So far we're at %s:%s ", word, phrase); } } SEE ALSO
memchr(3), strchr(3), strcspn(3), strpbrk(3), strrchr(3), strsep(3), strspn(3), strstr(3), wcstok(3) STANDARDS
The strtok() function conforms to ISO/IEC 9899:1990 (``ISO C90''). AUTHORS
Wes Peters, Softweyr LLC: <wes@softweyr.com> Based on the FreeBSD 3.0 implementation. BUGS
The System V strtok(), if handed a string containing only delimiter characters, will not alter the next starting point, so that a call to strtok() with a different (or empty) delimiter string may return a non-NULL value. Since this implementation always alters the next starting point, such a sequence of calls would always return NULL. BSD
November 27, 1998 BSD
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