12-02-2009
Remove lines from batch of files which match pattern
I need to remove all lines which does not match the pattern from a text file (batch of text files). I also need to keep the header line which is the first line of the file. Please can you provide an example for that.
I used this to solve half of my work. I was unable to keep the first line of the file with this. Please help. Thanks.
sed -i '/searchtext/!d' *.txt
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LEARN ABOUT DEBIAN
iob_new
iob_new(3) Library Functions Manual iob_new(3)
NAME
iob_new - create new I/O batch
SYNTAX
#include <iob.h>
io_batch* iob_new(int hint_entries);
DESCRIPTION
iob_new creates a new I/O batch with enough space allocated for hint_entries entries (buffers or files). This is purely a performance
hint, if you are unsure just pass 1.
You can add buffers, strings and files to an I/O batch and then send it all at once using iob_send.
The benefit of the I/O batch API is that it exploits platform specific APIs like FreeBSD's sendfile. The file contents will always be sent
in a way that allows the operating systems to perform zero copy TCP, and the buffers will always be sent using as few syscalls as possible
and avoiding unnecessary copying (using writev).
RETURN VALUE
iob_new returns a pointer to an I/O batch data structure. If there was a memory allocation error, it returns NULL instead.
SEE ALSO
iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3), iob_addfile(3)
iob_new(3)