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Full Discussion: Ed to modify a file --- or not?
Top Forums Shell Programming and Scripting Ed to modify a file --- or not? Post 302997799 by edstevens on Friday 19th of May 2017 02:10:44 PM
Old 05-19-2017
Ed to modify a file --- or not?
Running Oracle Linux 6 (derivative of RHEL 6)

Given this snippet of code in a shell script:

Code:
#-- reset oratab to use 11.2 home for dwdev
#--  normally we'd just use sed to do this sort of thing, but that would
#--  require permissions that we don't have in the /etc/ directory, so we
#--  use 'ed' instead.
echo =======================================================
echo `date +%Y-%m-%d" "%H:%M:%S` - Modifying /etc/oratab
echo Original oratab entry for dwdev:
grep ^dwdev /etc/oratab
ed -s /etc/oratab <<EOF
,s|dwdev:/u01/app/oracle/product/12.1.0.2/dbhome_1:N|dwdev:/u01/app/oracle/product/11.2.0.4/dbhome_1:N|
w
q
EOF
echo New oratab entry for dwdev:
grep ^dwdev /etc/oratab

The output looks exactly as I expect, and the rest of the script, that is depending on these settings, behaves exactly as planned. Here's the output through that section:
Code:
2017-05-19 12:51:28 - Modifying /etc/oratab
Original oratab entry for dwdev:
dwdev:/u01/app/oracle/product/12.1.0.2/dbhome_1:N# line added by Agent
New oratab entry for dwdev:
dwdev:/u01/app/oracle/product/11.2.0.4/dbhome_1:N# line added by Agent

However, when the script is complete, I go back and check the contents of the subject file (/etc/oratab) and it is back to its original:

Code:
oracle:dwdev$ grep ^dwdev /etc/oratab
dwdev:/u01/app/oracle/product/12.1.0.2/dbhome_1:N               # line added by Agent

The rest of the script is pretty lengthy and involved, but I see nothing else in it that could conceivably modify the file /etc/oratab
 

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LEARN ABOUT MOJAVE

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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