Am Mi,06.08.2008 um 15:57 schrieb William Squires:
What's the proper way to make a C/ObjC program (Foundation tool) be
used with the pipe operator? I want to make a simple filter that
takes the output of "ls -la" and reformats it to appear more like
the MS-DOS directory listing. So, I would do something like "ls -la
| mydosfilter" and get a directory listing with the filename first,
the # bytes second, then the timestamp (leaving out everything from
the UNIX permissions bits to the group, and rearranging the rest.)
On UNIX the pipe-in is the stdin., the pipe-out the stdout. So you can
just read from stdin to get the data piped and write it to stdout.
(TAKE CARE ABOUT THE SIZE OF CHAR-ARRAYS! *g*)
I think, that this is c-standard …
Also, what's the proper place to put the resulting executable so
all users can use it in Terminal.App without having to do "ls -la |
<path to mydosfilter>" every time. Can I put this in the deployment
target once the linker is done? Do I need "sudo" to copy there? I
know just enough tcsh stuff to be dangerous... :)
Finally, what's the number just after the UNIX permissions bits?
the PID?
A file does not have a PID!?!
man ls:
The Long Format
If the -l option is given, the following information is
displayed for each file: file mode, number of
links, owner name, group name, number of bytes in the file,
abbreviated month, day-of-month file was
last modified, hour file last modified, minute file last
modified, and the pathname. In addition, for
each directory whose contents are displayed, the total number of
512-byte blocks used by the files in
the directory is displayed on a line by itself immediately
before the information for the files in the
directory. If the file or directory has extended security
information, the permissions field printed
by the -l option is followed by a '+' character.
Amin
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