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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 302997802 by Don Cragun on Friday 19th of May 2017 02:48:32 PM
Old 05-19-2017
From the output you have shown us, it appears that ed is doing what you requested. So, if the contents of /etc/oratab have gone back to their original state when the script terminates, it would seem likely that has modified the file.

If the command:
Code:
grep oratab scriptname

where scriptame is the name of the file containing your shell script doesn't show any output other than:
Code:
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
echo New oratab entry for dwdev:
grep ^dwdev /etc/oratab

then one might guess that:
  1. something in your script invokes another command that resets /etc/oratab's contents,
  2. there is another directory entry hard-linked to /etc/oratab and your script is modifying the file using a different filename,
  3. there is another file that is a symbolic link pointing to /etc/oratab and your script is modifying the file using the name of one of those symbolic links, or
  4. some other script is asynchronously changing the contents of /etc/oratab that seems to run consistently between the time the second grep in your code shows that the file changed and the time when you notice that the contents have reverted to their original contents after your script terminates.
This User Gave Thanks to Don Cragun For This Post:
edstevens
 

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LEARN ABOUT PHP

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
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