Shell Programming and Scripting

Legends,

Please help me out to come out of below situation.

I have a file ABC.txt with the following entries. (example below. actual entries are more than 200 lines)

PM3_fun
PM4_fun
FIMr_mrg
FIMr_gap
FIMr_copy
FIMser_sync
FIMer_rep
FIMer_rep

Now i want to comment out these lines (#) in front of these.
How do i do that?

Regards,
dossanjh

If you do want to specify different line patterns, you can do something like:

Code:

sed -e 's/\(^PM3_fun$\)/#\1/g' -e 's/\(^PM4_fun$\)/#\1/g' ABC.txt

This will comment lines "PM3_fun" and "PM4_fun".
add more -e parts in the same way for other lines.

Also. PM3 and PM4 can be combined as PM[34], and in the same way for other patterns also.
But if you having only these lines, specifying explicitly won't be harder too.

Anchal,

Thanks for the reply, but i have near about 200 different patterns.

one question, ABC.txt has around 200 lines with different pattern along with other lines which is not to be commented?

if this is the case, you have to provide the identified key for how to determined the line which is to be commented.

other way, if you having all the patterns in a separate file, then probably it would be easier.

ABC.txt has 2400 lines in total and out of that 200 line of some pattern that needs to be commented. rest of the lines should be untouched.

For the lines to be commented pattern, i have got those in a temp file to use it as an identified key.

---------- Post updated at 08:40 PM ---------- Previous update was at 08:36 PM ----------

I am facing hard luck in the previous solution as well. The command runs but not commenting enteries.

sed -e 's/\(^FIM$\)/#\1/g' /tmp/abc


san% grep FIM /tmp/abc
FIM1
FIM2
FIMR45

---------- Post updated at 08:54 PM ---------- Previous update was at 08:40 PM ----------

Got the quick workaround to enjoy my weekend


perl -p -i -e "s/PM/#PM/g" ABC.TXT

If you have a file with the keys like:

Code:

PM3
PM4
FIMr
.
.

you can do something like:

Code:

awk -F_ '
NR==FNR{a[$0];next}
$1 in a {$0 = "#" $0}
{print}' keyfile file