CODEWITHSUNDEEP
bashshellsedawk
Ron
Ron

Reputation: 3

AWK or Sed, or together?

I think i have a sed or awk question. I am trying to manipulate a config file from a bash script, but i can't find the right way to do it.

I have the following in my config file:

bla.update(
{'test': {'tag': 'twenty',

and want to replace it to:

bla.update({
'test': {'tag': 'twenty',

I tried all sort of sed & awk tutorials, but i can't find it.

It must be not too hard i guess, but i am stuck, please help me!!

Upvotes: 0

Views: 179

Answers (4)

Ed Morton
Ed Morton

Reputation: 204184

With GNU awk so you can read the whole file at one time using -v RS='\0' (will also work with SOME other awks):

$ awk -v RS='\0' -v ORS= '{gsub(/\n{/,"{\n")}1' file
bla.update({
'test': {'tag': 'twenty',

With other awks you can use some other character that's not present in the input file, e.g. a control-C or similar, instead of \0 as the Record Separator above or you can do:

$ awk -v RS= -v ORS='\n\n' '{gsub(/\n{/,"{\n")}1' file
bla.update({
'test': {'tag': 'twenty',

but it will compress sequences of consecutive blank lines to a single blank line and add a trailing blank line at the end of the file if one wasn't already present.

Finally, you can construct a string from the whole file contents read one line at a time using any awk and then operate on that string in the END section:

$ awk '{s=s $0 ORS} END{gsub(/\n{/,"{\n",s); printf "%s",s}' file
bla.update({
'test': {'tag': 'twenty',

Upvotes: 2

Christian Fritz
Christian Fritz

Reputation: 21374

sed ':a;N;$!ba;s/(\n{/({\n/g'

works for me

Upvotes: 2

jkshah
jkshah

Reputation: 11713

Here's an attempt using sed

sed 'N;s/(\s*\n\s*{/({\n/g' file

Sample Input:

bla.update(
{'test': {'tag': 'twenty',

Output:

bla.update({
'test': {'tag': 'twenty',

Upvotes: 1

Jotne
Jotne

Reputation: 41460

Some like this:

awk 'f {sub(/{/,x);f=0} /bla.update/ {$0=$0 "{";f=1}1'
bla.update({
'test': {'tag': 'twenty',

It search for bla.update and then add { at the end and set flag f=1 If flag f is set then remove { from start of line and clear flag.

Upvotes: 1

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