12-27-2018
PATH is something that tells the computer where to look for programs, and in what order to search for the programs.
By programs, I am referring to many of the commands you use in unix - cp, rm, mv, cat - are actually programs.
So, if you type 'cat myfile', unix would look in /usr/bin folder first to find the program cat.exe; then it will do what cat is programmed for, display the contents of the parameter you typed, myfile
Defining data_dir is a common programming step. This avoids the need to specify it everywhere in your script, and (MOST IMPORTANTLY) allows you to adjust the location just once rather than throughout your script.
thus, in your script you could have the following commands (if the archiv_dir was also defined):
cat $data_dir"/workfile.txt"
mv $data_dir"/workfile.txt" $archv_dir"/workfile.arc"
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CAT(1) FSF CAT(1)
NAME
cat - concatenate files and print on the standard output
SYNOPSIS
cat [OPTION] [FILE]...
DESCRIPTION
Concatenate FILE(s), or standard input, to standard output.
-A, --show-all
equivalent to -vET
-b, --number-nonblank
number nonblank output lines
-e equivalent to -vE
-E, --show-ends
display $ at end of each line
-n, --number
number all output lines
-s, --squeeze-blank
never more than one single blank line
-t equivalent to -vT
-T, --show-tabs
display TAB characters as ^I
-u (ignored)
-v, --show-nonprinting
use ^ and M- notation, except for LFD and TAB
--help display this help and exit
--version
output version information and exit
With no FILE, or when FILE is -, read standard input.
AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for cat is maintained as a Texinfo manual. If the info and cat programs are properly installed at your site, the
command
info cat
should give you access to the complete manual.
cat (coreutils) 4.5.3 February 2003 CAT(1)