2018-03-19 9:54 GMT+09:00 Michael Forney <mforney@xxxxxxxxxxx>: > From: Michael Forney <forney@xxxxxxxxxx> > > stat(1) is not standardized and different implementations have their own > (conflicting) flags for querying the size of a file. > > ls(1) provides the same information (value of st.st_size) in the 5th > column, except when the file is a character or block device. This output > is standardized[0]. The -n option turns on -l, which writes lines > formatted like > > "%s %u %s %s %u %s %s\n", <file mode>, <number of links>, > <owner name>, <group name>, <size>, <date and time>, > <pathname> > > but instead of writing the <owner name> and <group name>, it writes the > numeric owner and group IDs (this avoids /etc/passwd and /etc/group > lookups as well as potential field splitting issues). > > The <size> field is specified as "the value that would be returned for > the file in the st_size field of struct stat". > > To avoid duplicating logic in several locations in the tree, create > scripts/file-size.sh and update callers to use that instead of stat(1). > > [0] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html#tag_20_73_10 > > Signed-off-by: Michael Forney <forney@xxxxxxxxxx> > --- > Changes in v2: > * Use a wrapper script instead of calling ls(1) directly. > * Also replace a couple of other instances of `stat -c '%s'`. > * Update description with justification of ls(1) usage. > Applied to linux-kbuild. Thanks! -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
