what - identify SCCS files (DEVELOPMENT)
what [-s] file...
The what utility searches the given files for all occurrences of the pattern that get (see get) substitutes for %Z% (@(#)) and writes to standard output what follows until the first occurrence of one of the following:
" > newline \ NUL
The what utility supports the XBD specification, Utility Syntax Guidelines . The following option is supported:
- Quit after finding the first occurrence of the pattern in each file.
The following operands are supported:
- A pathname of a file to search.
The input files are of any file type.
The following environment variables affect the execution of what:
- Provide a default value for the internationalisation variables that are unset or null. If LANG is unset or null, the corresponding value from the implementation-dependent default locale will be used. If any of the internationalisation variables contains an invalid setting, the utility will behave as if none of the variables had been defined.
- If set to a non-empty string value, override the values of all the other internationalisation variables.
- Determine the locale for the interpretation of sequences of bytes of text data as characters (for example, single- as opposed to multi-byte characters in arguments and input files).
- Determine the locale that should be used to affect the format and contents of diagnostic messages written to standard error.
- Determine the location of message catalogues for the processing of LC_MESSAGES .
The standard output consists of the following for each file operand:
"%s:\n\t%s\n", <pathname>, <identification string>
Used only for diagnostic messages.
The following exit values are returned:
- Any matches were found.
The what utility is intended to be used in conjunction with the SCCS command get, which automatically inserts identifying information, but it can also be used where the information is inserted by any other means.
When the string "@(#)" is included in a library routine in a shared library, it might not be found in an a.out file using that library routine.
If the C-language program in file f.c contains:
char ident = "@(#)identification information";
and f.c is compiled to yield f.o and a.out then the command:
what f.c f.o a.out
f.c: identification information ... f.o: identification information ... a.out: identification information ...