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Full Discussion: Find all lines in file such that each word on that line appears in at least n lines of the file
Top Forums Shell Programming and Scripting Find all lines in file such that each word on that line appears in at least n lines of the file Post 302999201 by uncleMonty on Thursday 15th of June 2017 08:15:39 AM
Old 06-15-2017
Thanks for the friendly welcome Don. I haven't had any homework assignments for over 25 years. I'm a hobbyist working on a maths problem. I wrote a little C program to generate this data, and want to sort through it with shell tools as an intermediate step to solving the problem empirically (as a hint to myself, before I try to solve it mathematically). I am using Bash by default, since it is the default shell on my laptop running OS 10.6, but other shells are available. What I have done so far: stared at it and realised I don't know how to do this kind of multi-line search with the handful of shell commands I have taught myself over the last 30 years (and only used very infrequently, when such problems come up). I suppose I could also have tried to do this weeding out within my C program, but I can't see how to do it without having to hold everything in memory all at once (again, I write such programs very infrequently). So, it seems better to write it to a file then use some other tool in the shell to search that file. Hence my posting here. I'm sure there is a better way, but I break out my C and shell scripts about once every 6 months and at my age it's often easier to ask.

Is there anyone less suspicious who might be able to point me in a useful direction?
 

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LEARN ABOUT OSX

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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