10-08-2018
Most Unix and Linux systems have a /usr/local directory, which contains bin, sbin, etc and man directories, into which you can add your own programs and associated configuration files and man pages, without worry about being overwritten by updates to the OS.
On my Ubuntu system these are also included in the ENV_PATH and ENV_SUPATH variables mentioned in post 2.
I understand that a newcomer to Linux may not be aware of the significance of this directory, causing them to re-invent the wheel, but unless you have a very good reason for using /mybin I would urge you to move everything into /usr/local/bin.
Andrew
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whereis(1) General Commands Manual whereis(1)
NAME
whereis - Locates files for programs
SYNOPSIS
whereis [-bms] [-u] [-BMS directory... -f] program...
The whereis command locates source, binary, and/or reference page files for the specified program program.
OPTIONS
The -b, -m, and -s options can be used in combination to restrict the search. Searches for an executable program. Searches for the refer-
ence page for a program. Searches for the sources of a program.
Use the -B, -M, and -S options to change or limit the places whereis searches. Specifies the binary directories to search. Specifies the
reference page directories to search. Specifies the source directories to search.
The other options that can be used with whereis are as follows: Terminates the last directory list and signals the start of program names.
Used with other options to indicate when there is no file for program in the default or specified directory or directories (source, binary,
or reference page).
DESCRIPTION
The whereis program locates source, binary, and reference pages for the specified programs. When looking for a match, the program names
are stripped of leading pathname components and any trailing extensions of the form (for example, s. resulting from the use of the Source
Code Control System see sccs(1), are also handled.
The default directories searched by the whereis command are as follows: /etc /etc/nls /sbin /usr/bin /usr/lbin /usr/lbin/spell /usr/ccs/lib
/usr/lib /usr/local /usr/hosts /usr/sbin
EXAMPLES
To find files matching cat in the default source, binary, and reference directories, enter: whereis cat To search for reference pages for
app13 in the directory /usr/local/man, enter: whereis -M /usr/local/man -f -f appl3 To find the programs in /usr/bin that do not have ref-
erence pages in /usr/share/man/man1 with source files in /usr/src/cmd, enter: whereis -u -M /usr/share/man/man1
-S /usr/src/cmd -f /usr/bin/* To find which files in the current directory either have no reference pages in the default reference
directories or have more than one, enter: whereis -m -u *
FILES
Default binary directories. Default binary directories. Default reference directories. Default source directories.
SEE ALSO
Commands: apropos(1), find(1), man(1), which(1), catman(8)
whereis(1)