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Old 05-28-2008, 01:46 AM   #1
hamimi
LQ Newbie
 
Registered: Mar 2008
Location: Johannesburg
Posts: 5

Rep: Reputation: 0
replaced variable field within shell script using sed


Hi
I have a file called myfile:
contents as follows:
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/apps/m
edsys/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/apps/m
edtst/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/u1/med
sys/wrk/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/u1/prn
tsys/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/usr/pr
ntsys/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/usr/sy
s_data/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/usr/ut
il/' -x 7 restore
/usr/snapshot-efb/snapshot -i 10.3.15.25 -a '/mnt/i/a/a' -2 483326bf -3 '/backup
/medsys/' -x 7 restore

my problem is trying to amend the 7th field which is "483326bf" using this script:
# Add the Tagnumber to change
TAGNUM=`awk '/snap/ {print $7}' myfile`
NEWTAGNUM=`awk '/snap/ {print $7}' myfile.out`
echo "Enter the The Tag Number for Restore, or Q to quit if not required."
echo "-->\c "
read TAG
case $TAG in
q|Q) break ;;
*) echo "Tag Number -->\c "
echo $TAG >newfile
echo $TAG >>newfile
echo $TAG >>newfile
echo $TAG >>newfile
echo $TAG >>newfile
echo $TAG >>newfile
for FILE in `ls myfile`
do
sed -e 's/"$TAGNUM"/"$newfile"/g' myfile >myfile.out
# sed -e 's!$TAGNUM!$newfile!g' myfile >myfile1
done
esac

I somehow cannot get the variable changed withing my script -If I manually replace $TAGNUM to 483326bf it works.
Any help will be much appreciated

thanks
Hamim
 
Old 05-28-2008, 02:37 AM   #2
ophirg
Member
 
Registered: Jan 2008
Location: Israel
Distribution: Kubuntu 13.10
Posts: 134

Rep: Reputation: 34
I'm not sure what exactly are you trying to do
but try this:

Code:
#!/bin/bash
echo enter old tag:
read OLDTAG
echo enter new tag:
read NEWTAG
sed "s/$OLDTAG/$NEWTAG/" oldfile > newfile
update:
also try
Code:
#!/bin/bash
echo enter new tag:
read NEWTAG
awk "{\$7=\"$NEWTAG\"; print \$0}" oldfile > newfile

Last edited by ophirg; 05-28-2008 at 03:06 AM.
 
Old 05-28-2008, 08:01 AM   #3
hamimi
LQ Newbie
 
Registered: Mar 2008
Location: Johannesburg
Posts: 5

Original Poster
Rep: Reputation: 0
works 100%

Thanks -It works
that is what i was looking for

Hamim
 
  


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