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Full Discussion: Insert a line of text on nth line of a file
Top Forums UNIX for Beginners Questions & Answers Insert a line of text on nth line of a file Post 302967507 by drl on Wednesday 24th of February 2016 10:07:52 AM
Old 02-24-2016
Hi.

One of the missing routines is insert_every:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate repeating string insertion, insert_every

PROGRAM="./insert_every"
# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C 

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

pl " Results:"
$PROGRAM --n=3 "Hello" < $FILE

pl " Text of perl code, $PROGRAM:"
cat $PROGRAM

exit 0

producing:
Code:
$  ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.3 (jessie) 
bash GNU bash 4.3.30

-----
 Input data file data1:
1
2
3
4
5
6
7
8
9
10

-----
 Results:
1
2
3
Hello
4
5
6
Hello
7
8
9
Hello
10

-----
 Text of perl code, ./insert_every:
#!/usr/bin/env perl

# @(#) insert_every     Write first-parameter-string after --n=x lines.
# $Id: insert_every,v 1.2 2015/03/18 12:38:41 drl Exp drl $

# The Missing Textutils, Ondrej Bojar, obo@cuni.cz
# http://www.cuni.cz/~obo/textutils
#
# 'insert_every' processes stdin to stdout, writing ARG1 after every n
# lines

use strict;
use warnings;
use Getopt::Long;

sub usage {
  print STDERR "insert_every text_to_insert <stdin >stdout
Options:
  --n=X   ... insert after n lines
";
  exit 1;
}

my $n     = 10;
my $usage = 0;
GetOptions(
  "help" => \$usage,
  "n=i"  => \$n,
);
usage() if $usage;

my $extra = shift;

my $nr = 0;
while (<>) {
  $nr++;
  print;
  print $extra. "\n" if $nr % $n == 0;
}

To see all of the dozens of missing textutil perl codes, visit the web page of Ondrej Bojar as noted in the script comments (verified as of today, Wed Feb 24 09:05:48 CST 2016).

Best wishes ... cheers, drl
 

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LEARN ABOUT SUNOS

cvcd

cvcd(1M)						  System Administration Commands						  cvcd(1M)

NAME

       cvcd - virtual console daemon

SYNOPSIS

       /platform/platform_name/cvcd

DESCRIPTION

       The virtual console daemon, cvcd, is a server process that supports the network console provided on some platforms. The cvcd daemon accepts
       network console connections from a remote host (only one host at any given time). Console input is read from this connection and  forwarded
       to cvc(7D) by way of cvcredir(7D).

       Similarly,  console  output is read from cvcredir(7D) and forwarded across the network console connection. If cvcd dies, console traffic is
       automatically rerouted through an internal hardware interface.

       The cvcd daemon normally starts at system boot time. Each domain supports only one cvcd process at a time.

       Caution:        On Sun Enterprise 10000 domains, cvcd uses a configuration file (/etc/ssphostname) to determine the name of the	host  from
		       which  network console connections are allowed. If the remote console host is renamed, you must edit the configuration file
		       to reflect that change.

OPERANDS

       The following operands are supported:

       platform_name	       The official Sun platform name used in packaging and code. For example, for Sun Fire 15K servers, the platform_name
			       would	 be SUNW,Sun-Fire-15000.

ATTRIBUTES

       See  attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Architecture		     |Sun     Enterprise    10000  |
       |			     |servers,	Sun Fire High-End  |
       |			     |Systems			   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcvc.u 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       svcs(1), svcadm(1M), services(4), attributes(5), smf(5), cvc(7D), cvcredir(7D)

       Sun Enterprise 10000 SSP Reference Manual

       System Management Services (SMS) Reference Manual

NOTES

       The cvcd service is managed by the service management facility, smf(5), under the service identifier:

       svc:/system/cvc

       Administrative  actions	on  this  service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser-
       vice's status can be queried using the svcs(1) command.

SunOS 5.10							    11 Aug 2004 							  cvcd(1M)
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