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Full Discussion: Grep Commands
Top Forums Shell Programming and Scripting Grep Commands Post 302848067 by radoulov on Wednesday 28th of August 2013 11:40:43 AM
Old 08-28-2013
You could try something like this:
Code:
awk -F\| '{
  print > ($3 ~ /201[01]/ ? "textfile_archive.txt" : "__tmp__")
  }' textfile.txt

textfile_archive.txt will contain the records from 2010/2011, __tmp__ will contain the rest of the records.
If you want to overwrite the original textfile.txt, just add the following after the awk code:
Code:
mv __tmp__ textfile.txt

 

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LEARN ABOUT OPENDARWIN

shar

SHAR(1) 						    BSD General Commands Manual 						   SHAR(1)

NAME

     shar -- create a shell archive of files

SYNOPSIS

     shar file ...

DESCRIPTION

     shar writes an sh(1) shell script to the standard output which will recreate the file hierarchy specified by the command line operands.
     Directories will be recreated and must be specified before the files they contain (the find(1) utility does this correctly).

     shar is normally used for distributing files by ftp(1) or mail(1).

SEE ALSO

     compress(1), mail(1), uuencode(1), tar(1)

BUGS

     shar makes no provisions for special types of files or files containing magic characters.

EXAMPLES

     To create a shell archive of the program ls(1) and mail it to Rick:

	   cd ls
	   shar `find . -print` |  mail -s "ls source" rick

     To recreate the program directory:

	   mkdir ls
	   cd ls
	   ...
	   <delete header lines and examine mailed archive>
	   ...
	   sh archive

HISTORY

     The shar command appears in 4.4BSD.

SECURITY CONSIDERATIONS

     It is easy to insert trojan horses into shar files.  It is strongly recommended that all shell archive files be examined before running them
     through sh(1).  Archives produced using this implementation of shar may be easily examined with the command:

	   egrep -v '^[X#]' shar.file

4.4BSD								   June 6, 1993 							    4.4BSD
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