need urgent help 

 

I have a file with data like this(50K lines unnay file lo)

cat file

test:testA:testB:testC:testD:testE:testF

test1:test1A:test1B:test1C:testD:test1E:test1F

test2:test2A:test2B:test2C:testD:test2E:test2F

test3:test3A:test3B:test3C:testD:test3E:test3F

test4:test4A:test4B:test4C:testD:test4E:test4F

 

 

My task is to change few lines from this file based on  a match 

 

cat list

test1

test2

 

I want to change testD to testXX only on the lines that matches with list

 

i tried this

 

for i in `cat list`

do

grep $i file | sed -i 's/testD/testXX/g' file

done

 

but it is replacing everyline. My task is to update these only but everyhting else stay as is.

test1:test1A:test1B:test1C:testD:test1E:test1F

test2:test2A:test2B:test2C:testD:test2E:test2F

 

 

HELP please !!!!

 

if i understand this right. you want to replace testD with Testxxx for lines starting with test1 and test2? 

 

you could grep ^ to match only lines with start with test1 an test2 from list file. 

10 minutes ago, maverick19 said:

if i understand this right. you want to replace testD with Testxxx for lines starting with test1 and test2? 

 

you could grep ^ to match only lines with start with test1 an test2 from list file. 

How do i use grep ^ bhayya .. I tried this and this is exactly what i want. But this is only printing result. How do i make changes directly in fil

 

for i in `cat list`;  do grep $i file | sed 's/testD/testXX/g' ;  done

test1:test1A:test1B:test1C:testXX:test1E:test1F

test2:test2A:test2B:test2C:testXX:test2E:test2F

 

 

 

Quote

tr '{match}' '{replace}' < input.txt > output.txt

 

7 minutes ago, dasari4kntr said:

 

I dont think tr will work in my case. I want to change only the lines that match with the file "list" not every single line

cat list

test1

test2

3 minutes ago, dingdong143 said:

I dont think tr will work in my case. I want to change only the lines that match with the file "list" not every single line

cat list

test1

test2

AWK. ..?

58 minutes ago, dingdong143 said:

need urgent help 

 

I have a file with data like this(50K lines unnay file lo)

cat file

test:testA:testB:testC:testD:testE:testF

test1:test1A:test1B:test1C:testD:test1E:test1F

test2:test2A:test2B:test2C:testD:test2E:test2F

test3:test3A:test3B:test3C:testD:test3E:test3F

test4:test4A:test4B:test4C:testD:test4E:test4F

 

 

My task is to change few lines from this file based on  a match 

 

cat list

test1

test2

 

I want to change testD to testXX only on the lines that matches with list

 

i tried this

 

for i in `cat list`

do

grep $i file | sed -i 's/testD/testXX/g' file

done

 

but it is replacing everyline. My task is to update these only but everyhting else stay as is.

test1:test1A:test1B:test1C:testD:test1E:test1F

test2:test2A:test2B:test2C:testD:test2E:test2F

 

 

HELP please !!!!

 

You dont need to grep for it. Sed has an option to search for matching variables.  try something like this 

for i in `cat list`; do  sed -i.bak '/$i/s/testD/testXX/g' file ; done

Just now, chingchang said:

You dont need to grep for it. Sed has an option to search for matching variables.  try something like this 

for i in `cat list`; do  sed -i.bak '/$i/s/testD/testXX/g' file ; done

 

1 hour ago, dingdong143 said:

need urgent help 

 

I have a file with data like this(50K lines unnay file lo)

cat file

test:testA:testB:testC:testD:testE:testF

test1:test1A:test1B:test1C:testD:test1E:test1F

test2:test2A:test2B:test2C:testD:test2E:test2F

test3:test3A:test3B:test3C:testD:test3E:test3F

test4:test4A:test4B:test4C:testD:test4E:test4F

 

 

My task is to change few lines from this file based on  a match 

 

cat list

test1

test2

 

I want to change testD to testXX only on the lines that matches with list

 

i tried this

 

for i in `cat list`

do

grep $i file | sed -i 's/testD/testXX/g' file

done

 

but it is replacing everyline. My task is to update these only but everyhting else stay as is.

test1:test1A:test1B:test1C:testD:test1E:test1F

test2:test2A:test2B:test2C:testD:test2E:test2F

 

 

HELP please !!!!

 

Actually, use double quotes as it is a variable. Try this 

 

 

for i in `cat list`; do  sed -i.bak "/$i/s/testD/testXX/g" file ; done

4 hours ago, dingdong143 said:

How do i use grep ^ bhayya .. I tried this and this is exactly what i want. But this is only printing result. How do i make changes directly in fil

 

for i in `cat list`;  do grep $i file | sed 's/testD/testXX/g' ;  done

test1:test1A:test1B:test1C:testXX:test1E:test1F

test2:test2A:test2B:test2C:testXX:test2E:test2F

 

 

 

try sed directly on the file. 

 

 

string before /s is used to search the lines with that value and replace testXX with testD in those lines

for i in `cat list`; do 

sed -i.txt '/^$1/s/testXX/testD/' text.txt 

done