strextract - batch string extraction
strextract [-p patternfile] [-i ignorefile] [-d] [source-program...]
-i Ignore text strings specified in ignorefile. By default, the strex-
tract command searches for ignorefile in the current working directory,
your home directory, and /usr/lib/nls.
If you omit the -i option, strextract recognizes all strings specified
in the patterns file.
-p Use patternfile to match strings in the input source program. By
default, the command searches for the pattern file in the current work-
ing directory, your home directory, and finally /usr/lib/nls.
If you omit the -p option, the strextract command uses a default pat-
terns file that is stored in /usr/lib/nls/patterns.
-d Disables warnings of duplicate strings. If you omit the -d option,
strextract prints warnings of duplicate strings in your source program.
The strextract command extracts text strings from source programs. This
command also writes the string it extracts to a message text file. The mes-
sage text file contains the text for each message extracted from your input
source program. The strextract command names the file by appending .str to
the name of the input source program.
In the source-program argument, you name one or more source programs from
which you want messages extracted. The strextract command does not extract
messages from source programs included using the #include directive. There-
fore, you might want a source program and all the source programs it
includes on a single strextract command line.
You can create a patterns file (as specified by patternfile ) to control
how the strextract command extracts text. The patterns file is divided into
several sections, each of which is identified by a keyword. The keyword
must start at the beginning of a new line, and its first character must be
a dollar sign ($). Following the identifier, you specify a number of pat-
terns. Each pattern begins on a new line and follows the regular expression
syntax you use in the regexp(3) routine. For more information on the pat-
terns file, see the patterns(4) reference page.
In addition to the patterns file, you can create a file that indicates
strings that extract ignores. Each line in this ignore file contains a
single string to be ignored that follows the syntax of the regexp(3)
When you invoke the strextract command, it reads the patterns file and the
file that contains strings it ignores. You can specify a patterns file and
an ignore file on the strextract command line. Otherwise, the strextract
command matches all strings and uses the default patterns file.
If strextract finds strings which match the ERROR directive in the pattern
file, it reports the strings to standard error (stderr.) but does not write
the string to the message file.
After running strextract, you can edit the message text file to remove text
strings which do not need translating before running strmerge.
It is recommended that you use extract command as a visual front end to
the strextract command rather than running strextract directly.
Given the default pattern file, you cannot cause strextract to ignore
strings in comments that are longer than one line.
You can specify only one rewrite string for all classes of pattern matches.
The strextract command does not extract strings from files include with
#include directive. You must run the strextract commands on these files
% strextract -p c_patterns prog.c prog2.c
% vi prog.str
% strmerge -p c_patterns prog.c prog2.c
% gencat prog.cat prog.msg prog2.msg
% vi nl_prog.c
% vi nl_prog2.c
% cc nl_prog.c nl_prog2.c
In this example, the strextract command uses the c_patterns file to deter-
mine which strings to match. The input source programs are named prog.c and
If you need to remove any of the messages or extract one of the created
strings, edit the resulting message file, prog.str. Under no conditions
should you add to this file. Doing so could result in unpredictable
You issue the strmerge command to replace the extracted strings with calls
to the message catalog. In response to this command, strmerge, creates the
source message catalogs, prog.msg and prog2.msg, and the output source pro-
grams, nl_prog.c and nl_prog2.c.
You must edit nl_prog.c and nl_prog2.c to include the appropriate catopen
and catclose function calls.
The gencat command creates a message catalog and the cc command creates an
gencat(1), extract(1), strmerge(1), regexp(3), catopen(3), patterns(4)
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