sed find/replace 2

[ksbrace]

Hello,
I'm a newbie to shell scripting and was given the task to work on some scripts that are not working correctly.

The script is doing a find/replace, but it's doing too good of a job, if that is possible.

VARIABLES="ORA_HOST Z39_HOST [URL unfurl="true"]WWW_HOST[/URL] ORACLE_SID"

#Use sed to search for variable definition and replace with
#user defined variable

for VAR in $VARIABLES
do
  VALUE=""
  case $VAR in
     ORA_HOST)          VALUE=$ORA_HOST;;
     Z39_HOST)          VALUE=$Z39_HOST;;
     [URL unfurl="true"]WWW_HOST)[/URL]          VALUE=$[URL unfurl="true"]WWW_HOST;;[/URL]
     ORACLE_SID)        VALUE=$ORACLE_SID;;
  esac

$SED 's/^.*setenv.*[^{]'${VAR}'[^}].*/        setenv    '${VAR}'     '${VALUE}'/
' $ALEPH_START > $ALEPH_START_TEMP

$DIFF $ALEPH_START $ALEPH_START_TEMP >> $LOG
$MV $ALEPH_START_TEMP $ALEPH_START >> $LOG 2>&1
done
echo "-------------------------------------------------------" >> $LOG

I want it to change this line:
setenv ORACLE_SID aleph14

But not this one:
setenv ORACLE_ALERT_LOG $ORACLE_BASE/admin/$ORACLE_SID/bdump/alert_${O
RACLE_SID}.log

Any help would be greatly appreciated. Thanks in advance.
Kelly

 

[PHV]

Replace this:
[^{]
with this:
[^{\$]

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ181-2886

 

[ksbrace]

Hello, I have a similar situation. I have commented the line I want to change and the line I want to leave as is. As of right now, the code is doing too much, it's changing both lines and I just want it to change the first one.

##Substitute SIDE and CAMP with the appropriate values.
 source /aleph/SIDE/CAMP/alephe/aleph_start
        source $aleph_proc/def_local_env

        set old_alephver_alias = `alias alephver`
        alias alephver 'echo "xxxx" > /dev/null'

##Leave the line below AS IS!
setenv suny_aleph_app_version ${ALEPH_CAMP_SIDE}

Current code:

$SED 's/'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

My attempt at fixing it:

$SED 's[^ALEPH]/'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

Any help would be greatly appreciated. Thanks,

 

[feherke]

Hi

Wrong syntax of the [tt]s///[/tt] command. You put the character enumeration between the command name ( [tt]s[/tt] ) and the first delimiter ( [tt]/[/tt] ). Move them after it.

Feherke.

http://rootshell.be/~feherke/

 

[ksbrace]

Ok, I made the change correctly, I think...but it's still replacing the line I don't want it to replace. any help would be great!

$SED 's/[^ALEPH]'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

$DIFF $ALEPH_SHUTDOWN $ALEPH_SHUTDOWN_TEMP >> $LOG
$MV $ALEPH_SHUTDOWN_TEMP $ALEPH_SHUTDOWN >> $LOG 2>&1

##Substitute SIDE and CAMP with the appropriate values.
 source /aleph/SIDE/CAMP/alephe/aleph_start
        source $aleph_proc/def_local_env

        set old_alephver_alias = `alias alephver`
        alias alephver 'echo "xxxx" > /dev/null'

##Leave the line below AS IS!
setenv suny_aleph_app_version ${ALEPH_CAMP_SIDE}

 

[feherke]

Hi

This ALEPH is a literar string which should not be in front of the replaceable exression ? Just because [tt][^ALEPH][/tt] means none of the enumerated characters, not as you ( I think ) wants, not the given literar string.

As far as I know, this is not possible with [tt]sed[/tt]. I propose to try [tt]perl[/tt] :

"(?<!pattern)"
A zero-width negative look-behind assertion. For example
"/(?<!bar)foo/" matches any occurrence of "foo" that does not
follow "bar". Works only for fixed-width look-behind.

perl -pe 's/(?<!ALEPH)'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

Feherke.

http://rootshell.be/~feherke/

 

[ksbrace]

Feherke,
I would love to be able to use perl, but the boss wants to maintain the shell scripts. So I need to do his way. His quote "There are 3 ways of doing things: the right way, the wrong way, and his way" So, if anyone else has some helpful tips on how to fix this, it would be greatly appreciated. Thanks in advance!

 

[feherke]

Hi

And what is the difference between using 1 [tt]sed[/tt] command and using 1 [tt]perl[/tt] command for the string substitution ? Ok, let it lost.

If you are sure, the [tt]${START_SIDE}[/tt] string appears only once per line, you could check that in the address part :

$SED '/ALEPH'${START_SIDE}'/!s/'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

Feherke.

http://rootshell.be/~feherke/

 

[ksbrace]

feherke,
Thanks for your help! I tried the sed command from the previous post:

$SED '/ALEPH'${START_SIDE}'/!s/'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

But that didn't work.
it's changing the line to:
setenv suny_aleph_app_version ${ALEPH_itx_dev}
I need this line to stay as is:
setenv suny_aleph_app_version ${ALEPH_CAMP_SIDE}

So, I decided to be a 'rebel' and inserted the perl command:

perl -pe 's/(?<!ALEPH)'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

it also changed the line I didn't want to change.

Any other ideas?

##Substitute SIDE and CAMP with the appropriate values.
 source /aleph/SIDE/CAMP/alephe/aleph_start
        source $aleph_proc/def_local_env

        set old_alephver_alias = `alias alephver`
        alias alephver 'echo "xxxx" > /dev/null'

##Leave the line below AS IS!
setenv suny_aleph_app_version ${ALEPH_CAMP_SIDE}

 

[feherke]

Hi

Honestly, I did not understand the situation, I just modified your [tt]sed[/tt] command.

- What are the [tt]$START_SIDE[/tt] and [tt]$DEST_SIDE[/tt] variable values ?
- If would be to change that file by hand, not with a script, how you know which line to change ?

Hmm... I think I completely missed the point.

Feherke.

http://rootshell.be/~feherke/

 

[ksbrace]

$START_SIDE=SIDE
$DEST_SIDE=dev or prod

I guess I could add a replacment line at the end that goes back and changes ALEPH_itx_dev to its original state, but that does'nt seem to be the correct way of doing it. Thanks.

 

[PHV]

Why not simply this ?
$SED "/ALEPH_.*$START_SIDE/!s/$START_SIDE/$DEST_SIDE/" $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

Hope This Helps, PH.
Want to get great answers to your Tek-Tips questions? Have a look at FAQ219-2884 or FAQ181-2886

 

[feherke]

Hi

So the "ALEPH" string is not exactly before the replaceable part, there is at least an underscore, or even the string "CAMP" between them ? Then say it that there could be, lets say, up to 6 other characters between the two strings :

$SED '/ALEPH[red].\{0,6\}[/red]'${START_SIDE}'/!s/'${START_SIDE}'/'${DEST_SIDE}'/' $ALEPH_SHUTDOWN > $ALEPH_SHUTDOWN_TEMP

Feherke.

http://rootshell.be/~feherke/

 

[ksbrace]

Feherke & PHV,
Many thanks, both ways seem to work just fine. I'm learning more and more each day with these scripts, so hopefully my job will eventually become a bit more relaxing. These scripts are for opening libraries with exlibris software...if youcare. Thanks again!