用 sed 替换多个文件中的出现

Question

I have more than 30 files where I have to replace the occurrence

msgstr "" preceded by msgid "(aged %s)

by the contents of

msgstr "..." belonging to the first occurrence of msgid "(aged %s)

All the files are located in directory resources/ :

resources
   lang-fr
       file.po
   lang-ge
       file.po
   lang-it
       file.po
   

If this could help there are only 3 occurrences of msgid "(aged %s) per file.

File: file.po

...
...
msgid "(aged %s)
msgstr "good translation %s"
...
...
msgid "(aged %s)
msgstr ""
...
....
msgid "(aged %s)
msgstr ""
....
....

Expected result:

File: file.po

....
...
msgid "(aged %s)
msgstr "good translation %s"
...
...
msgid "(aged %s)
msgstr "good translation %s"
...
....
msgid "(aged %s)
msgstr "good translation %s"
....
....

I've spent a few hours trying with sed, but I'm stuck.

Answer 1

With a shell variable, and two instances of sed :

r="$(sed -n '/^msgid "(aged %s)$/{n;s/^[^"]*"//p;q}' file.po)"
sed '/^msgid "(aged %s)$/{n;s/\(^msgstr "\)"$/\1'"$r"'/}' file.po 

After the first run of sed , the variable $r will contain good translation %s" . The next sed pass looks for "" and substitutes it with $r .

It could also be done uglier without the variable:

sed '/^msgid "(aged %s)$/{n;s/\(^msgstr "\)"$/\1'"$(sed -n '/^msgid "(aged %s)$/{n;s/^[^"]*"//p;q}' file.po)"'/}' file.po

---

See also Baeldung 's useful survey Using sed to Replace a Multi-Line String .

Answer 2

For now I have only following script which do not what expected

#!/bin/bash
find resources/lang -name '*.po' -exec sed '/^msgid "(aged %s)$/!b
n;/^msgstr "/!b
x;/^$/x;h' {} \;

For now unfortunately Input = Output

#: app/Age.php:183
#, php-format
msgid "(aged %s)"
msgstr "objective"


#. I18N: The age of an individual at a given date for a Male individual
#: app/Age.php:184
#, php-format
msgctxt "MALE"
msgid "(aged %s)"
msgstr ""


#. I18N: The age of an individual at a given date for a Female individual
#: app/Age.php:188
#, php-format
msgctxt "FEMALE"
msgid "(aged %s)"
msgstr ""