CODEWITHSUNDEEP
regexbashsedincrement
Elad Benda
Elad Benda

Reputation: 36656

search with regex and increment int

I haver few files (same file name) with this text

version: 24
runtime: python27

How can I increment the version number in all of them from the cmd?

I can do easy sed command, but I'm looking for smart increment and not just replacing text

sed -i '' -e 's/24/25/g' PATH

Upvotes: 1

Views: 92

Answers (4)

ctac_
ctac_

Reputation: 2471

With gnu sed

sed '/version: /{h;s/.*\( [0-9]*\)/echo $((\1+1))/e;x;s/ .*//;G;s/\n/ /}' infile

Upvotes: 1

iBug
iBug

Reputation: 37227

sed surely does the job but it's not a good idea to stick to it. A little bash trick would be better.

VER=$(grep 'version' filename | grep -oE '[0-9]+')
sed -i "/version/s/$VER/$((VER+1))/" filename

It's really a trick because sed can't do arithmetic calculations, so I overloaded that job to bash and use sed to do text replacement only.

For convenience use, you may want to wrap them up:

incr_ver() {
  VER=$(grep 'version' "$1" | grep -oE '[0-9]+')
  (( $? )) || sed -i "/version/s/$VER/$((VER+1))/" "$1"
}

And apply them to each file:

for file in *
do
  incr_ver "$file"
done

Upvotes: 1

Cyrus
Cyrus

Reputation: 88583

With awk:

awk '/^version:/ {$2++}; {print}' file

Or shorter:

awk '/^version:/ {$2++}1' file

Ouput:

version: 25
runtime: python27

Upvotes: 5

Sundeep
Sundeep

Reputation: 23667

sed is not suitable for arithmetic operations, you can use perl here

$ perl -pe 's/\d+/$&+1/e if /version/' ip.txt 
version: 25
runtime: python27
  • s/\d+/$&+1/e the e modifier allows Perl code in replacement section. $& contains the matched string (similar to & in sed), $&+1 is the result you need
    • if /version/ this substitution will happen only when input line contains version

For in-place editing, use perl -i -pe 's/\d+/$&+1/e if /version/' /path/to/files

See https://perldoc.perl.org/perlrun.html#Command-Switches for explanations on -i and -pe options

Upvotes: 2

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