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man:
section 1 is for commands, section 8 is for commands
not commonly used by users (i.e., they are intended to administer the
system), and
section
2 is for C functions and libraries.
To
read a manual page found at a particular
section,
you can type the section number and the page name after the man
command, like in
;
man 1 ls
lookman
is
used to search manual.
sig
displays the signature, i.e., the prototype for a C function
documented in section 2 of the manual.
Flag
-m
asks ls
to print the name of the user who last modified a file, along with
the file name.
cp
accepts more than one (source) file name to copy to the destination
file name.
We
can see a dump of the bytes kept within that file using the program
xd
(hexadecimal dump). This program reads a file and writes its contents
so that it is
easy
for us to read. Option -b
asks xd
to print the contents as a series of bytes:
term%
xd -b TODO
0000000
63 6f 70 79 20 6d 6b 64 65 70 20 66 72 6f 6d 20
0000010
6c 65 66 66 65 20 28 2d 72 20 66 6c 61 67 29 0a
0000020
0a
0000021
Adding
option -c,
the program prints the character for each byte when feasible:
term%
xd -b -c TODO
0000000
63 6f 70 79 20 6d 6b 64 65 70 20 66 72 6f 6d 20
0
c o p y m k d e p f r o m
0000010
6c 65 66 66 65 20 28 2d 72 20 66 6c 61 67 29 0a
10
l e f f e ( - r f l a g ) /n
0000020
0a
20
/n
0000021
The
command nm (name list)
displays the names of symbols (i.e., procedure names, variables) that
are contained or required by our object and executable files.