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Full Discussion: search for string and add the second line below
Top Forums Shell Programming and Scripting search for string and add the second line below Post 302680033 by hcclnoodles on Wednesday 1st of August 2012 06:14:03 AM
Old 08-01-2012
search for string and add the second line below
Hi there, i have an /etc/hosts file that is organised in sections, like this

Code:
#
# Oracle Servers
#
1.1.1.1  boxa
2.2.2.2  boxb
9.9.9.9  boxj

#
# Prod Sybase Servers
#
6.6.6.6  boxt
4.4.4.4 boxz

I am just trying to write a line of code that will ill be able to pass the comment block name without the prepended hash and space (e.g. just ' Prod Sybase Servers') and it would add the new host entry at the top of the block under the last comment hash

Ive managed to put together a little awk line that will take a string to search in the first column ($1) and place the new entry directly below it,

Code:
 nawk -v entry="5.5.5.5 boxy" -v string='6.6.6.6' '{if ($1==string) {print $0"\n"entry} else {print $0}}' /etc/hosts

This code will place my new entry below the '6.6.6.6 boxt' entry (or any other string that I search in the first column). This would work fine if i always knew an IP address in the file to search for, but in reality, we would like to define the comment block to add to as this will always be consistent. The downside is that it will have a variable amount of columns


Whist having the issue of trying to define the columns that need searching, I also have the issue of getting it to appear underneath the single hash that will always be directly below the search string. (so I want it to appear on the line after the next line down)

so for example if i provided a search string of 'Prod Sybase Servers' and a new entry of '5.5.5.5 boxy' then i would want it to look like this (based on the above example file)


Code:
#
# Oracle Servers
#
1.1.1.1  boxa
2.2.2.2  boxb
9.9.9.9  boxj

#
# Prod Sybase Servers
#
5.5.5.5 boxy
6.6.6.6  boxt
4.4.4.4 boxz


Any help or advice on how i could tackle this one would be greatly appreciated
 

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LEARN ABOUT ULTRIX

lprsetup

lprsetup(8)						      System Manager's Manual						       lprsetup(8)

Name
       lprsetup - printer spooler set up program

Syntax
       /etc/lprsetup

Description
       The command provides an interactive easy-to-use facility for administrating the line printers on your system.  The program contains on-line
       help and default answers to questions about adding, deleting, or changing the characteristics of any of the line printers on  your  system.
       Whenever  a  question  is  asked,  the  default	selection  is given in ] .  You can press Return in response to the question to accept the
       default, or enter an alternate value for the given parameter.

       The program knows about all of the possible symbols in the file.  See for a current list.  After you have entered a printer  specification,
       and  have  verified  that  it  is  correct,  then creates the spooling directory, links the output filter, and creates an entry for the new
       printer.

       If the printer is connected to your system, you must specify the printer device name which is in the lp printcap entry.

       If lp is set to nn you are prompted to choose between or If your printer is connected to a port on your system, choose the default setting,
       If you choose you are prompted for the baud rate, br.  The default is the recommended baud rate for the printer.

       If  you	want  to set up your printer to a LAT line, choose the option.	At this point, proceeds only if you have chosen a valid LAT device
       for lp.	It assumes that the LAT device has been configured for host initiated connections using If it has not, you must do this before the
       queue works.  For information about how to set up a LAT line, see Chapter 3 of the Guide to Ethernet Communications Servers.

       If  lp  is  set	to another device, for example the program assumes that you are setting up a printer with a parallel port, for example, It
       does not prompt you for device type information, and serial port specific entries are not put into the entry.

See Also
       printcap(5), lpc(8), MAKEDEV(8)
       Guide to Ethernet Communications Servers
       Guide to System Environment Setup

																       lprsetup(8)
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