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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 LINUX

chsh

CHSH(1) 							   User Commands							   CHSH(1)

NAME

       chsh - change login shell

SYNOPSIS

       chsh [options] [LOGIN]

DESCRIPTION

       The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
       the login shell for her own account; the superuser may change the login shell for any account.

OPTIONS

       The options which apply to the chsh command are:

       -h, --help
	   Display help message and exit.

       -s, --shell SHELL
	   The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.

       If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
       value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.

NOTE

       The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
       and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
       in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
       back to its original value.

FILES

       /etc/passwd
	   User account information.

       /etc/shells
	   List of valid login shells.

       /etc/login.defs
	   Shadow password suite configuration.

SEE ALSO

       chfn(1), login.defs(5), passwd(5).

User Commands							    06/24/2011								   CHSH(1)
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