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Editing files in shell programing

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# 1  
Old 07-13-2005
Editing files in shell programing
Hi folks,

In our product installation program we edit xml files by deleting lines and appending new lines instead of them.
For example:
update_Log4plsql_xml()
{
machineName=`uname -n`
hostIP=`cat /etc/hosts | grep ${machineName} | cut -f1`

trap 'clean_up | tee -a $installLog ; exit' 1 2 3 4 15 16
echo "\nChecking log4plsql.xml ..." >> $installLog
errMsg="ERROR: unable to add environmental parameter to log4plsql.xml - see error log"
validMsg="-> VALID: Successfully updated log4plsql.xml"
export log4plsqlxml=${orcaHome}/Log4plsql/properties/log4plsql.xml
export grepXml=HOST_NAME
export lineNum=`grep -n ${grepXml} ${log4plsqlxml} | awk -F: '{print $1}'`
echo "#!/bin/ksh
ed -s ${log4plsqlxml} <<EOF >/dev/null
${lineNum}
d
${lineNum}-1
a
<dburl>jdbcSmilieracle:thin:@${DB_HOST}:1521:${ORACLE_SID} /dburl>
.
w
q
EOF" > /tmp/log4plsqlED && chmod 755 /tmp/log4plsqlED && /tmp/log4plsqlED
confirm_return
rm /tmp/log4plsqlED
}

What do u think about this kind of method?
Do you have any efficient alternatives to edit files?

Thanks in advance,
Nir
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LEARN ABOUT FREEBSD

shar

SHAR(1) 						    BSD General Commands Manual 						   SHAR(1)

NAME

     shar -- create a shell archive of files

SYNOPSIS

     shar file ...

DESCRIPTION

     The shar command writes a sh(1) shell script to the standard output which will recreate the file hierarchy specified by the command line op-
     erands.  Directories will be recreated and must be specified before the files they contain (the find(1) utility does this correctly).

     The shar command is normally used for distributing files by ftp(1) or mail(1).

EXAMPLES

     To create a shell archive of the program ls(1) and mail it to Rick:

	   cd ls
	   shar `find . -print` | mail -s "ls source" rick

     To recreate the program directory:

	   mkdir ls
	   cd ls
	   ...
	   <delete header lines and examine mailed archive>
	   ...
	   sh archive

SEE ALSO

     compress(1), mail(1), tar(1), uuencode(1)

HISTORY

     The shar command appeared in 4.4BSD.

BUGS

     The shar command makes no provisions for special types of files or files containing magic characters.  The shar command cannot handle files
     without a newline ('
') as the last character.

     It is easy to insert trojan horses into shar files.  It is strongly recommended that all shell archive files be examined before running them
     through sh(1).  Archives produced using this implementation of shar may be easily examined with the command:

	   egrep -v '^[X#]' shar.file

BSD
								   June 6, 1993 							       BSD