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Full Discussion: find files with 2 or more words
Top Forums Shell Programming and Scripting find files with 2 or more words Post 302188425 by era on Wednesday 23rd of April 2008 12:44:29 PM
Old 04-23-2008
Code:
grep -l John file more files | xargs grep -l Mary

grep -l prints the names of the files with matches. xargs arranges this list as command line arguments for the second grep; again, we only want grep to print the names of the matching files.

xargs is a general-purpose command for rearranging things so that the results from a pipeline can be passed as command-line arguments to another command.

A roughly equivalent construction would be to use backticks, but xargs has some additional niceties, such as being able to split the commands into multiple processes if the command line grows longer than the kernel can handle.

Here's the same with backticks (at the peril, then, of getting a "Command line too long" error):

Code:
grep -l Mary `grep -l John file more files`

Those are grave accents (ASCII 96), not regular apostrophes.
 

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LEARN ABOUT OSX

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), tar(1), uuencode(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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