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Top Forums Shell Programming and Scripting to extract string from main string and string comparison Post 302573926 by vivek d r on Wednesday 16th of November 2011 07:17:44 AM
Old 11-16-2011
my goal is to write a shell script which takes two mysql dump files(one is latest dump which has new changes to be made and other one is older mysql dump) the script compares both the files and and give the delta (that is changed to to be made ) as output. the changes in the sense.. new mysql dump file has two more columns added in the table blahblahblah so the scipt finds out which are the columns missing and from which table and writes alter table query to that particular table. i am stuck in the part where i need to extract table wise from the file and also in comparison between files. right now i have wrote shell script which just prints out lines missing from one file compared to other.. its copy is shown in
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https://www.unix.com/shell-programming-scripting/171076-shell-scripting.html#post302573569

thanks for replying in short time

---------- Post updated at 03:45 PM ---------- Previous update was at 03:41 PM ----------

this is required for my project since currently we use mysql testbench to get this delta changes of database compared to new changes. and use this delta changes file to alter the old database so that it reflects all the new changes. but i want to avoid using testbench for this function and write a shell script which performs its functions.

---------- Post updated at 05:47 PM ---------- Previous update was at 03:45 PM ----------

Quote:
Originally Posted by ahamed101
Whatever you have mentioned can be done, but what is your ultimate goal?...

Code:
table_name=$( awk -F\` '/CREATE TABLE/{print $2}' input_file )

--ahamed
the above query works good thanks.. :-)
consider the below code

Code:
`id` int(11) NOT NULL AUTO_INCREMENT,
`action` enum('Change','Delete','Add','Locked','Unlocked') COLLATE utf8_unicode_ci DEFAULT 'Change',
`date` datetime DEFAULT NULL,

`reserved1` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`reserved2` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
`zoneId` int(11) DEFAULT NULL,

these are the column names in the earlier mentioned table. how to extract these column names dynamically cause i want to use it in a function so if i send either
`reserved2` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL
or
`zoneId` int(11) DEFAULT NULL
(the above two line will be stored in the variable.. i am using while loop to read from file so technically in first run one column will be held in $line )
it should extract reserved2 or zoneid respectively.. how to do it..?
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1: A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.10 5 Jul 1990 shell(1F)
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