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Full Discussion: ./configure backslash questions
Top Forums UNIX for Dummies Questions & Answers ./configure backslash questions Post 302311376 by RobertSubnet on Tuesday 28th of April 2009 01:06:47 PM
Old 04-28-2009
./configure backslash questions
Hello all. I am going to try my hand at compiling tarballs rather than installing packages.

I have a pretty good understanding of the process and have even compiled/installed Top from source.

But that was an easy install, I want to try something more complex using the various configure flags.

From what I have read, you can specify a number of options with the flags. From my reading, I often see a flag followed by a backslash ("\").

What I am wondering, are there any special rules with regards to the use of these backslashes? IE: single space after the flag and then the backslash? Does the flag denote a return? Is there no backslash used after the last flag in the list?

While on the subject of ./configure, what of the single quotes, are they necessary? I don't see them used too often.

Below is a sample ./configure I got from the MySQL site to demonstrate what I mean:

./configure \
'--prefix=/usr/local/mysql' \
'--disable-dependency-tracking' \
'--enable-assembler' \
'--localstatedir=/usr/local/mysql/data' \
'--libexecdir=/usr/local/mysql/bin' \
'--libdir=/usr/local/mysql/lib' \
'--enable-local-infile' \
'--enable-shared' \
'--enable-thread-safe-client' \
'--with-archive-storage-engine' \
'--with-big-tables' \
'--with-comment=MySQL Community Server (GPL)' \
'--with-extra-charsets=complex' \
'--with-innodb' \
'--with-mysqld-ldflags=-all-static' \
'--with-readline' \
'--with-server-suffix=-standard' \
'--with-unix-socket-path=/tmp/mysql.sock' \
'--with-zlib-dir=bundled' \
'--without-debug' \
'--without-docs' \
'--without-man'

Also why the \ immediately after the ./configure? Rather than say:
./configure --prefix=/usr/local/mysql \
<rest of the text>

is that just to make it neat for the web page and perfectly valid code?

Thank you for your comments.
~Robert
 

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LEARN ABOUT CENTOS

pmdamysql

PMDAMYSQL(1)						       Performance Co-Pilot						      PMDAMYSQL(1)

NAME

       pmdamysql - MySQL database PMDA

DESCRIPTION

       pmdamysql is a Performance Co-Pilot PMDA which extracts live performance data from a running MySQL database.

INSTALLATION

       pmdamysql uses a configuration file from (in this order):

       o   /etc/pcpdbi.conf

       o   $PCP_PMDAS_DIR/mysql/mysql.conf

       This file can contain overridden values (Perl code) for the settings listed at the start of pmdamysql.pl, namely:

       o   database name (see DBI(3) for details)

       o   database user name

       o   database pass word

       Once this is setup, you can access the names and values for the mysql performance metrics by doing the following as root:

	       # cd $PCP_PMDAS_DIR/mysql
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/mysql
	       # ./Remove

       pmdamysql is launched by pmcd(1) and should never be executed directly.	The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

Binary Status values in text
       Some of the status values are in the form of YES/NO or ON/OFF.

       Since these cannot be intepreted by tools like PMIE, they have been duplicated with a _num extension and the values of 1 (YES/ON) or 0
       (NO/OFF).

   Eg:
       o   mysql.slave_status.slave_io_running

       o   mysql.slave_status.slave_io_running_num

FILES

       /etc/pcpdbi.conf
	   configuration file for all PCP database monitors

       $PCP_PMDAS_DIR/mysql/mysql.conf
	   configuration file for pmdamysql

       $PCP_PMDAS_DIR/mysql/Install
	   installation script for the pmdamysql agent

       $PCP_PMDAS_DIR/mysql/Remove
	   undo installation script for the pmdamysql agent

       $PCP_LOG_DIR/pmcd/mysql.log
	   default log file for error messages from pmdamysql

SEE ALSO

       pmcd(1), pmdadbping.pl(1) and DBI(3).  # vi: sw=4 ts=4 et:

3.8.10							       Performance Co-Pilot						      PMDAMYSQL(1)
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