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Get line number when matches a string

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# 1  
Old 02-02-2010
Get line number when matches a string
If I have a file something like as shown below,

Code:
ARM*187878*hjhj
BAG*88778*jjjj
COD*7777*kkkk
BAG*87878*kjjhjk
DEF*65656*89989*khjkk

I need the line numbers to be added with a colon when it matches the string "BAG". Here in my case, I need something like

Code:
ARM*187878*hjhj
2:BAG*88778*jjjj
COD*7777*kkkk
4:BAG*87878*kjjhjk
DEF*65656*89989*khjkk

I can use this
Code:
awk '{print FNR ":" $0}'

for getting the line numbers. Can anyone advise how to fetch based on the beginning of s string
# 2  
Old 02-02-2010
Code:
 awk '/^BAG/{print FNR ":" $0;next}{print}' infile

# 3  
Old 02-02-2010
Code:
awk ' /^BAG/ {printf("%d:", FNR) }
        print $0  ' oldfile > newfile

# 4  
Old 02-02-2010
Code:
awk '/^BAG/{$0=NR":"$0}1'  infile

# 5  
Old 02-02-2010
perl solution:-

Code:
perl -wnl -e '/^BAG/ and print "$.:$_" or print $_ ;' infile.txt

SmilieSmilieSmilie

---------- Post updated at 15:06 ---------- Previous update was at 15:01 ----------

or more simpler:-

Code:
perl  -i.bac -wpl -e 's/(^BAG.+)/$.:$&/ ;' infile.txt

SmilieSmilieSmilie
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