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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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SYBASE_PCONNECT(3)														SYBASE_PCONNECT(3)

sybase_pconnect - Open persistent Sybase connection

SYNOPSIS
resource sybase_pconnect ([string $servername], [string $username], [string $password], [string $charset], [string $appname]) DESCRIPTION
sybase_pconnect(3) acts very much like sybase_connect(3) with two major differences. First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection. Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (sybase_close(3) will not close links established by sybase_pconnect(3)). This type of links is therefore called 'persistent'. PARAMETERS
o $servername - The servername argument has to be a valid servername that is defined in the 'interfaces' file. o $username - Sybase user name o $password - Password associated with $username. o $charset - Specifies the charset for the connection o $appname - Specifies an appname for the Sybase connection. This allow you to make separate connections in the same script to the same data- base. This may come handy when you have started a transaction in your current connection, and you need to be able to do a separate query which cannot be performed inside this transaction. RETURN VALUES
Returns a positive Sybase persistent link identifier on success, or FALSE on error. SEE ALSO
sybase_connect(3). PHP Documentation Group SYBASE_PCONNECT(3)
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