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Top Forums Shell Programming and Scripting Incredibly inefficient cat | grep script Post 302913095 by Perderabo on Wednesday 13th of August 2014 04:22:24 PM
Old 08-13-2014
I'm not sure what thes files look like. But if they are sorted on the id field it sounds like this is just what the "join" command does. Here is a sample run:
Code:
$
$
$ cat file1
8  user 092 kjhuhggty
4  user 343 nbvnvcvc
9  user 391 jllklklkj
6  user 549 rewrewer
2  user 654 kjlkjl
7  user 760 jbjftgd
1  user 777 hkhghgh
3  user 888 hghfgfhgf
5  user 984 nbvnbvmn
$
$
$ cat file2
391
654
760
777
888
999
$
$
$ join -1 3 -2 1 -o "1.1 1.2 1.3 1.4"  file1 file2
9 user 391 jllklklkj
2 user 654 kjlkjl
7 user 760 jbjftgd
1 user 777 hkhghgh
3 user 888 hghfgfhgf
$
$

 

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cp(1)							      General Commands Manual							     cp(1)

Name
       cp - copy file data

Syntax
       cp [ -f ] [ -i ] [ -p ] file1 file2

       cp [ -f ] [ -i ] [ -p ] [ -r ] file... directory

       cp [ -f ] [ -i ] [ -p ] [ -r ] directory... directory

Description
       The command copies file1 onto file2.  The mode and owner of file2 are preserved if it already existed; the mode of file1 is used otherwise.
       Note that the command will not copy a file onto itself.

       In the second form, one or more files are copied into the directory with their original file names.

       In the third form, one or more source directories are copied into the destination directory with their original file names.

Options
       -f   Forces existing destination pathnames to be removed before copying, without prompting for confirmation.  The -i option is  ignored	if
	    the -f option is specified.

       -i   Prompts  user  with  the name of file whenever the copy will cause an old file to be overwritten. A yes answer will cause to continue.
	    Any other answer will prevent it from overwriting the file.

       -p   Preserves (duplicates) in the copies the modification time, access time, file mode, user ID, and group ID as allowed  by  the  permis-
	    sions of the source files, ignoring the present umask.

       -r   Copies  directories.  Entire directory trees, including their subtrees and the individual files they contain, are copied to the speci-
	    fied destination directory. The directory, its subtrees, and the individual files retain their original names. For	example,  to  copy
	    the directory including all of its subtrees and files, into the directory enter the following command:
	    cp -r reports news

See Also
       cat(1), pr(1), mv(1)

																	     cp(1)
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