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Top Forums Shell Programming and Scripting compare files and then remove some lines Post 302442397 by soliberus on Wednesday 4th of August 2010 05:54:33 AM
Old 08-04-2010
compare files and then remove some lines

Hi everyone

I have a dilemma and I'm hoping someone has an answer for me.

I have two files:

Code:
# cat masterfile
line3
line4
line5
line6
line7

Code:
# cat tempfile
line1
line2
line3
line4

I want to compare tempfile with masterfile.

If there are any rows in tempfile that are NOT present in masterfile (line1 and line2 in this example) I want to remove them from tempfile.

So the end result should be:

Code:
# cat tempfile
line3
line4

Can anyone advise me on how to accomplish this?

Many thanks

P.S. I'm using Solaris 10
 

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TEMPFILE(1)						      General Commands Manual						       TEMPFILE(1)

NAME
tempfile - create a temporary file in a safe manner SYNOPSIS
tempfile [-d DIR] [-p STRING] [-s STRING] [-m MODE] [-n FILE] [--directory=DIR] [--prefix=STRING] [--suffix=STRING] [--mode=MODE] [--name=FILE] [--help] [--version] DESCRIPTION
tempfile creates a temporary file in a safe manner. It uses tempnam(3) to choose the name and opens it with O_RDWR | O_CREAT | O_EXCL. The filename is printed on standard output. See tempnam(3) for the actual steps involved in directory selection. The directory in which to create the file might be searched for in this order (but refer to tempnam(3) for authoritative answers): a) In case the environment variable TMPDIR exists and contains the name of an appropriate directory, that is used. b) Otherwise, if the --directory argument is specified and appropriate, it is used. c) Otherwise, P_tmpdir (as defined in <stdio.h>) is used when appropriate. d) Finally an implementation-defined directory (/tmp) may be used. OPTIONS
-d, --directory DIR Place the file in DIR. -m, --mode MODE Open the file with MODE instead of 0600. -n, --name FILE Use FILE for the name instead of tempnam(3). The options -d, -p, and -s are ignored if this option is given. -p, --prefix STRING Use up to five letters of STRING to generate the name. -s, --suffix STRING Generate the file with STRING as the suffix. --help Print a usage message on standard output and exit successfully. --version Print version information on standard output and exit successfully. RETURN VALUES
An exit status of 0 means the temporary file was created successfully. Any other exit status indicates an error. BUGS
Exclusive creation is not guaranteed when creating files on NFS partitions. tempfile is deprecated; you should use mktemp(1) instead. EXAMPLE
#!/bin/sh #[...] t=$(tempfile) || exit trap "rm -f -- '$t'" EXIT #[...] rm -f -- "$t" trap - EXIT exit SEE ALSO
tempnam(3), mktemp(1) Debian 30 May 2011 TEMPFILE(1)
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