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This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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File is of type c:
b block (buffered) special
c character (unbuffered) special
p named pipe (FIFO)
f regular file
l symbolic link; this is never true if the -L option or the
-follow option is in effect, unless the symbolic link is
broken. If you want to search for symbolic links when -L
is in effect, use -xtype.
D door (Solaris)
File’s data was last modified n minutes ago.
File’s data was last modified n*24 hours ago. See the comments
for -atime to understand how rounding affects the interpretation
of file modification times.
File was modified more recently than file. If file is a sym‐
bolic link and the -H option or the -L option is in effect, the
modification time of the file it points to is always used.
Compares the timestamp of the current file with reference. The
reference argument is normally the name of a file (and one of
its timestamps is used for the comparison) but it may also be a
string describing an absolute time. X and Y are placeholders
for other letters, and these letters select which time belonging
to how reference is used for the comparison.
a The access time of the file reference
B The birth time of the file reference
c The inode status change time of reference
m The modification time of the file reference
t reference is interpreted directly as a time
Some combinations are invalid; for example, it is invalid for X
to be t. Some combinations are not implemented on all systems;
for example B is not supported on all systems. If an invalid or
unsupported combination of XY is specified, a fatal error
results. Time specifications are interpreted as for the argu‐
ment to the -d option of GNU date. If you try to use the birth
time of a reference file, and the birth time cannot be deter‐
mined, a fatal error message results. If you specify a test
which refers to the birth time of files being examined, this
test will fail for any files where the birth time is unknown.