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Full Discussion: Bash script - printing range of lines from text file
Top Forums Shell Programming and Scripting Bash script - printing range of lines from text file Post 302926124 by junior-helper on Friday 21st of November 2014 11:24:36 AM
Old 11-21-2014
Quote:
Originally Posted by ksmarine1980
Command line would look like this: ./lines_script.bash 5 15 <file.txt
Try this code (note it needs to be "hardened", e.g. checking if $1 and $2 were supplied, is $1 less than $2, etc.):
Code:
#!/bin/bash

ARGSTART=$1
ARGSTOP=$2

COUNT=0

while IFS= read -r line; do
 COUNT=$((COUNT+1))

  if [ $COUNT -ge $ARGSTART ] && [ $COUNT -le $ARGSTOP ]; then
   echo "$COUNT: $line"
  fi

done

Demo:
Code:
$ man bash | head -15 >bash.txt
$ ./script.sh 5 12 <bash.txt
5: NAME
6:        bash - GNU Bourne-Again SHell
7: 
8: SYNOPSIS
9:        bash [options] [file]
10: 
11: COPYRIGHT
12:        Bash is Copyright (C) 1989-2011 by the Free Software Foundation, Inc.
$

---------- Post updated at 06:24 PM ---------- Previous update was at 06:18 PM ----------

Quote:
Originally Posted by RudiC
what garbage do you get?
Don't know what OP gets, but I got some unary operator expected
This User Gave Thanks to junior-helper For This Post:
ksmarine1980
 

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LEARN ABOUT DEBIAN

libbash

LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME

     libbash -- A bash shared libraries package.

DESCRIPTION

     libbash  is  a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may
     want to load and use in scripts of your own.

     It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries.

     Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1).  A bash shared library that can be  loaded
     using
     ldbash(1) must answer 4 requirments:

     1.     It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash).

     2.     It must contain a line that begins with '#EXPORT='.  That line will contain (after the '=') a list of functions that the library
	    exports.  I.e. all the function that will be usable after loading that library will be listed in that line.

     3.     It must contain a line that begins with '#REQUIRE='.  That line will contain (after the '=') a list of bash libraries that are
	    required for our library.  I.e. every bash library that is in use in our bash library must be listed there.

     4.     The library must be listed (For more information, see ldbashconfig(8)).

   Basic guidelines for writing library of your own:
     1.     Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions.

     2.     Try to declare all variables intended for internal use as local.

     3.     Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with:
		  __<library_name>_
	    For example, internal function myfoosort of hashstash library should be named as
		  __hashstash_myfoosort
	    This helps to avoid conflicts in global name space when using libraries that come from different vendors.

     4.     See html manual for full version of this guide.

AUTHORS

     Hai Zaar <haizaar@haizaar.com>
     Gil Ran <ril@ran4.net>

SEE ALSO

     ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1)

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