find command with complex logic Post: 302387170

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Top Forums Shell Programming and Scripting find command with complex logic Post 302387170 by alister on Thursday 14th of January 2010 05:54:45 PM

01-14-2010

Registered User

Quote:

Originally Posted by MaureenT

That's great and clearly cleaner than the round about way that I was trying to do it. I guess it's time to stop putting off learning awk and sed.

ls -r | awk -F. '{a=$1$2$3$4} b!=a {b=a;i++} i>2

I get that awk is splitting the name using the period with -F and grabbing the first 4 sections separated by a period ($1$2$3$4). Then you want b to be everything but a. Just need to understand this piece {b=a;i++} .
Guess I better find a good book on awk and sed.

I apologize for having edited my code after you saw it (at the time, i still had not seen this response).

The code extracts the current filename's build number into the variable a and compares it against the build number of the previous filename which is stored in b. If they are the same, nothing happens. If they are different, the current build number becomes the previous build number and i is incremented. i is the total number of build numbers encountered. when i exceeds 2, it starts printing the lines encountered (these are the directory names to be removed using xargs).

Cheers,
alister

alister

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config.guess

CONFIG.GUESS(1)                                                    User Commands                                                   CONFIG.GUESS(1)

NAME

       config.guess - guess the build system triplet

SYNOPSIS

       config.guess [OPTION]

DESCRIPTION

       The GNU build system distinguishes three types of machines, the `build' machine on which the compilers are run, the `host' machine on which
       the package being built will run, and, exclusively when you build a compiler, assembler etc., the `target' machine, for which the  compiler
       being built will produce code.

       This script will guess the type of the `build' machine.

       Output the configuration name of the system `config.guess' is run on.

   Operation modes:
       -h, --help
              print this help, then exit

       -t, --time-stamp
              print date of last modification, then exit

       -v, --version
              print version number, then exit

ENVIRONMENT VARIABLES

       config.guess  might  need  to  compile  and  run  C  code,  hence it needs a compiler for the `build' machine: use the environment variable
       `CC_FOR_BUILD' to specify the compiler for the build machine.  If `CC_FOR_BUILD' is not specified, `CC' will be used.  Be sure  to  specify
       `CC_FOR_BUILD' is `CC' is a cross-compiler to the `host' machine.

         CC_FOR_BUILD    a native C compiler, defaults to `cc'
         CC              a native C compiler, the previous variable is preferred

REPORTING BUGS

       Report bugs and patches to <config-patches@gnu.org>.

       Originally written by Per Bothner.
       Copyright 1992-2016 Free Software Foundation, Inc.

       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1).

GNU Autoconf 2.69                                                   August 2017                                                    CONFIG.GUESS(1)