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Full Discussion: How to replace multiple file content?
Top Forums Shell Programming and Scripting How to replace multiple file content? Post 302853231 by ken6503 on Friday 13th of September 2013 01:08:40 PM
Old 09-13-2013
Quote:
Originally Posted by Corona688
I'm always leery of altering your originals, so back them up first:
Code:
# Create backup in case the replacement goes wrong!  ESSENTIAL!
tar -cf backup.tar currentfile_code_*

for FILE in currentfile_code_*
do
        sed 's#text=.*#text=newvalue#' < "$FILE" > /tmp/$$
        cat /tmp/$$ > "$FILE"
done

rm -f /tmp/$$

This script works, would you please tell me what the $$ mean?
 

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LEARN ABOUT HPUX

dgcfgbackup

dgcfgbackup(1M) 														   dgcfgbackup(1M)

NAME

       dgcfgbackup - create or update VxVM volume group configuration backup file

SYNOPSIS

       /usr/sbin/dgcfgbackup [-f  dg_conf_path ] dg_name

DESCRIPTION

       The dgcfgbackup command saves the VxVM configuration for a disk group in a default or alternate configuration backup file (see the descrip-
       tion of the-f option).

       By default, dgcfgbackup is run automatically each time that a VxVM command changes the VxVM configuration.  In this case,  it  always  uses
       the default configuration backup file.  An existing default configuration backup file is renamed with an extension of .old.

   Options and Arguments
       dg_name	 Specifies the name of a disk group.

       -f  dg_conf_path
		 Saves the configuration using an alternate file name specified by dg_conf_path.  If this option is omitted, the default file name
		 is /etc/vxvmconf/dg_name.conf.

EXIT CODES

       dgcfgbackup exits with a zero status on successful completion.  An non-zero exit status indicates that  errors  occurred  when  information
       from the disk group was being accessed.

EXAMPLES

       Back up VxVM configuration information for disk group testdg in the default backup file /etc/vxvmconf/testdg.conf:

       dgcfgbackup testdg

       Back up VxVM configuration information for disk group datadg in the alternate configuration backup file /tmp/datadg.backup:

       dgcfgbackup -f /tmp/datadg.backup datadg

NOTES

       It  is  recommended  that  any alternate configuration backup file be created in the root file system (as is the case with the default path
       name).  This facilitates disk group recovery during maintenance mode, such as after a system crash.

AUTHOR

       dgcfgbackup was developed by the Hewlett-Packard Company.

SEE ALSO

       dgcfgrestore(1M)

VxVM 5.0.31.1							    24 Mar 2008 						   dgcfgbackup(1M)
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