Replace each instance of a character in variable names across multiple files

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I have a list of template files that contain variables in this format:

my.var
my.other.var

I need to locate each instance and replace the . with _ so that each variable becomes:

my_var
my_other_var

I have tried doing this with sed and regex, but I am having trouble dealing with the fact that the variables can have any number of periods.

This is what I have so far:

for f in `cat list-of-files.txt`; do
 sed -i .bak -E 's/(.*).(.*)/1_2/g' $f
done;

Which results in

my_var
my.other_var

edited Jul 18 at 14:05

andcoz

11.5k32938

asked Jul 18 at 13:51

Fantic

184

Welcome to Unix Stackexchange! You can take the tour first and the learn How to Ask a good question. That makes it easier for us to help you.
â€“Â andcoz
Jul 18 at 14:06

add a commentÂ |Â

up vote
1
down vote

favorite

I have a list of template files that contain variables in this format:

my.var
my.other.var

I need to locate each instance and replace the . with _ so that each variable becomes:

my_var
my_other_var

I have tried doing this with sed and regex, but I am having trouble dealing with the fact that the variables can have any number of periods.

This is what I have so far:

for f in `cat list-of-files.txt`; do
 sed -i .bak -E 's/(.*).(.*)/1_2/g' $f
done;

Which results in

my_var
my.other_var

edited Jul 18 at 14:05

andcoz

11.5k32938

asked Jul 18 at 13:51

Fantic

184

Welcome to Unix Stackexchange! You can take the tour first and the learn How to Ask a good question. That makes it easier for us to help you.
â€“Â andcoz
Jul 18 at 14:06

add a commentÂ |Â

up vote
1
down vote

favorite

I have a list of template files that contain variables in this format:

my.var
my.other.var

I need to locate each instance and replace the . with _ so that each variable becomes:

my_var
my_other_var

I have tried doing this with sed and regex, but I am having trouble dealing with the fact that the variables can have any number of periods.

This is what I have so far:

for f in `cat list-of-files.txt`; do
 sed -i .bak -E 's/(.*).(.*)/1_2/g' $f
done;

Which results in

my_var
my.other_var

edited Jul 18 at 14:05

andcoz

11.5k32938

asked Jul 18 at 13:51

Fantic

184

I have a list of template files that contain variables in this format:

my.var
my.other.var

I need to locate each instance and replace the . with _ so that each variable becomes:

my_var
my_other_var

I have tried doing this with sed and regex, but I am having trouble dealing with the fact that the variables can have any number of periods.

This is what I have so far:

for f in `cat list-of-files.txt`; do
 sed -i .bak -E 's/(.*).(.*)/1_2/g' $f
done;

Which results in

my_var
my.other_var

edited Jul 18 at 14:05

andcoz

11.5k32938

asked Jul 18 at 13:51

Fantic

184

edited Jul 18 at 14:05

andcoz

11.5k32938

edited Jul 18 at 14:05

andcoz

11.5k32938

edited Jul 18 at 14:05

andcoz

11.5k32938

asked Jul 18 at 13:51

Fantic

184

asked Jul 18 at 13:51

Fantic

184

asked Jul 18 at 13:51

Fantic

184

Welcome to Unix Stackexchange! You can take the tour first and the learn How to Ask a good question. That makes it easier for us to help you.
â€“Â andcoz
Jul 18 at 14:06

add a commentÂ |Â

Welcome to Unix Stackexchange! You can take the tour first and the learn How to Ask a good question. That makes it easier for us to help you.
â€“Â andcoz
Jul 18 at 14:06

Welcome to Unix Stackexchange! You can take the tour first and the learn How to Ask a good question. That makes it easier for us to help you.
â€“Â andcoz
Jul 18 at 14:06

add a commentÂ |Â

2 Answers
2

active

oldest

votes

up vote
-1
down vote

accepted

Why not something like:

echo " my.other.var " | sed -n '/.*/s/./-/gp'

result:

 my-other-var

Pattern match for the format first and then execute the required sed commands if that pattern is met i.e. substitute - for .

answered Jul 18 at 14:11

Raman Sailopal

1,16317

Thanks! Additional note - this gave an error with the default version of sed on Mac OSX. I had to hop in to a Linux vm to use it.
â€“Â Fantic
Jul 18 at 14:25

The solution on Mac is to "brew install gnu-sed" and run the command with gsed instead of sed.
â€“Â Fantic
Jul 18 at 14:47

echo " my.other.var This will not work. It picks up false positives." | sed -n '/.*/s/./-/gp'
â€“Â ctrl-alt-delor
Jul 18 at 14:52

add a commentÂ |Â

up vote
1
down vote

I figured out a way to accomplish what I wanted with PERL as well. The trick was to use lazy modifiers.

perl -pi.back -e 's|(w+?).(w+?)|1_2|g' <filename>

my.var becomes my_var

answered Jul 18 at 14:37

Fantic

184

add a commentÂ |Â

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

up vote
-1
down vote

accepted

Why not something like:

echo " my.other.var " | sed -n '/.*/s/./-/gp'

result:

 my-other-var

Pattern match for the format first and then execute the required sed commands if that pattern is met i.e. substitute - for .

answered Jul 18 at 14:11

Raman Sailopal

1,16317

Thanks! Additional note - this gave an error with the default version of sed on Mac OSX. I had to hop in to a Linux vm to use it.
â€“Â Fantic
Jul 18 at 14:25

The solution on Mac is to "brew install gnu-sed" and run the command with gsed instead of sed.
â€“Â Fantic
Jul 18 at 14:47

echo " my.other.var This will not work. It picks up false positives." | sed -n '/.*/s/./-/gp'
â€“Â ctrl-alt-delor
Jul 18 at 14:52

add a commentÂ |Â

up vote
-1
down vote

accepted

Why not something like:

echo " my.other.var " | sed -n '/.*/s/./-/gp'

result:

 my-other-var

Pattern match for the format first and then execute the required sed commands if that pattern is met i.e. substitute - for .

answered Jul 18 at 14:11

Raman Sailopal

1,16317

Thanks! Additional note - this gave an error with the default version of sed on Mac OSX. I had to hop in to a Linux vm to use it.
â€“Â Fantic
Jul 18 at 14:25

The solution on Mac is to "brew install gnu-sed" and run the command with gsed instead of sed.
â€“Â Fantic
Jul 18 at 14:47

echo " my.other.var This will not work. It picks up false positives." | sed -n '/.*/s/./-/gp'
â€“Â ctrl-alt-delor
Jul 18 at 14:52

add a commentÂ |Â

up vote
-1
down vote

accepted

Why not something like:

echo " my.other.var " | sed -n '/.*/s/./-/gp'

result:

 my-other-var

Pattern match for the format first and then execute the required sed commands if that pattern is met i.e. substitute - for .

answered Jul 18 at 14:11

Raman Sailopal

1,16317

Why not something like:

echo " my.other.var " | sed -n '/.*/s/./-/gp'

result:

 my-other-var

Pattern match for the format first and then execute the required sed commands if that pattern is met i.e. substitute - for .

answered Jul 18 at 14:11

Raman Sailopal

1,16317

answered Jul 18 at 14:11

Raman Sailopal

1,16317

answered Jul 18 at 14:11

Raman Sailopal

1,16317

answered Jul 18 at 14:11

Raman Sailopal

1,16317

Thanks! Additional note - this gave an error with the default version of sed on Mac OSX. I had to hop in to a Linux vm to use it.
â€“Â Fantic
Jul 18 at 14:25

The solution on Mac is to "brew install gnu-sed" and run the command with gsed instead of sed.
â€“Â Fantic
Jul 18 at 14:47

echo " my.other.var This will not work. It picks up false positives." | sed -n '/.*/s/./-/gp'
â€“Â ctrl-alt-delor
Jul 18 at 14:52

add a commentÂ |Â

Thanks! Additional note - this gave an error with the default version of sed on Mac OSX. I had to hop in to a Linux vm to use it.
â€“Â Fantic
Jul 18 at 14:25

The solution on Mac is to "brew install gnu-sed" and run the command with gsed instead of sed.
â€“Â Fantic
Jul 18 at 14:47

echo " my.other.var This will not work. It picks up false positives." | sed -n '/.*/s/./-/gp'
â€“Â ctrl-alt-delor
Jul 18 at 14:52

Thanks! Additional note - this gave an error with the default version of sed on Mac OSX. I had to hop in to a Linux vm to use it.
â€“Â Fantic
Jul 18 at 14:25

The solution on Mac is to "brew install gnu-sed" and run the command with gsed instead of sed.
â€“Â Fantic
Jul 18 at 14:47

echo " my.other.var This will not work. It picks up false positives." | sed -n '/.*/s/./-/gp'
â€“Â ctrl-alt-delor
Jul 18 at 14:52

add a commentÂ |Â

up vote
1
down vote

I figured out a way to accomplish what I wanted with PERL as well. The trick was to use lazy modifiers.

perl -pi.back -e 's|(w+?).(w+?)|1_2|g' <filename>

my.var becomes my_var

answered Jul 18 at 14:37

Fantic

184

add a commentÂ |Â

up vote
1
down vote

I figured out a way to accomplish what I wanted with PERL as well. The trick was to use lazy modifiers.

perl -pi.back -e 's|(w+?).(w+?)|1_2|g' <filename>

my.var becomes my_var

answered Jul 18 at 14:37

Fantic

184

add a commentÂ |Â

up vote
1
down vote

I figured out a way to accomplish what I wanted with PERL as well. The trick was to use lazy modifiers.

perl -pi.back -e 's|(w+?).(w+?)|1_2|g' <filename>

my.var becomes my_var

answered Jul 18 at 14:37

Fantic

184

I figured out a way to accomplish what I wanted with PERL as well. The trick was to use lazy modifiers.

perl -pi.back -e 's|(w+?).(w+?)|1_2|g' <filename>

my.var becomes my_var

answered Jul 18 at 14:37

Fantic

184

answered Jul 18 at 14:37

Fantic

184

answered Jul 18 at 14:37

Fantic

184

answered Jul 18 at 14:37

Fantic

184

add a commentÂ |Â

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