I am trying to find occurence of captured pattern and pre-pend next line with captured pattern.
For example:
...
[line 10] #---------- SOLID: tank_phys.0
[line 11] Shape {
...
[line 22] #---------- SOLID: head_phys.0
[line 23] Shape {
...
expected output:
...
[line 10] #---------- SOLID: tank_phys.0
[line 11] DEF tank Shape {
...
[line 22] #---------- SOLID: head_phys.0
[line 23] DEF head Shape {
...
Here is what I have:
sed -rn '/#---------- SOLID: (.*)_phys.0/{n ; s/Shape/DEF <PreviousCapture> Shape/p;}' g4_00.wrl
How can I substitute Shape { with DEF tank Shape { ?
Thanks
GT
With a pure sed solution:
INPUT:
$ cat file
#---------- SOLID: tank_phys.0
Shape {
abcdef
1234
#---------- SOLID: head_phys.0
Shape {
12345
gdfg
Command:
$ sed -rn '/#---------- SOLID: (.*)_phys.0/{p;s/#---------- SOLID: (.*)_phys.0/DEF \1/;N;s/\n//;s/ {2,}/ /;s/^/ /p;b};/#---------- SOLID: (.*)_phys.0/!p' file
OUTPUT:
#---------- SOLID: tank_phys.0
DEF tank Shape {
abcdef
1234
#---------- SOLID: head_phys.0
DEF head Shape {
12345
gdfg
EXPLANATIONS:
/#---------- SOLID: (.*)_phys.0/{ #this block will be executed on each line respecting the regex /#---------- SOLID: (.*)_phys.0/
p; #print the line
s/#---------- SOLID: (.*)_phys.0/DEF \1/; #replace the line content using backreference to form DEF ...
N;#append next line Shape { to the pattern buffer
s/\n//;s/ {2,}/ /;s/^/ /p; #remove the new line, add/remove some spaces
b}; #jump to the end of the statements
/#---------- SOLID: (.*)_phys.0/!p #lines that does not respect the regex will just be printed