03-30-2012
#!/bin/bash should be the very first line. When you make it the second line, it's useless.
The output of ps is different in different versions of UNIX, yes.
Which kind and version of UNIX do you have? -- there are lots, UNIX is just a generic term. If you don't know, uname -a will tell you.
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uname(1) General Commands Manual uname(1)
NAME
uname - Displays information about the operating system
SYNOPSIS
uname [-amnrsvp]
uname [-S system-name]
The uname command displays system information or sets the system name.
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
uname: XCU5.0, SVID 4
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
Displays all information specified with the -m, -n, -r, -s, and -v options. Displays the type of hardware running the system. Displays
the name of the node (this may be a name that the system is known by to a communications network). [Tru64 UNIX] Displays the processor
type of the current host. Displays the release number of the operating system. Displays the name of the implementation of the operating
system. (This option is on by default.) [Tru64 UNIX] Changes the name of the system to system_name. The system_name argument is
restricted to SYS_NMLN-1 characters. The value of SYS_NMLN is implementation specific and is defined in /usr/include/sys/utsname.h. Only
users with appropriate privileges can use this option. Displays the operating system version.
OPERANDS
None
DESCRIPTION
The uname command writes system information to standard output. This command is used primarily to determine which system you are using.
The options cause selected information returned by the uname() call to be displayed.
NOTES
When the -a option is used, output is displayed in the order:
<system> <node> <release> <version> <hardware>
When you request information by specifying the individual options, the appropriate information is displayed in the order indicated.
[Tru64 UNIX] If the -p option is used, processor information is appended to the output line. The output of uname may include
embedded blank spaces, so you should use caution when passing the output to parsing algorithms.
EXIT STATUS
The following exit values are returned: The requested information has been successfully written. An error occurred.
EXAMPLES
To display the complete system name and version banner, enter: uname -a
ENVIRONMENT VARIABLES
The following environment variables affect the execution of uname: Provides a default value for the internationalization variables that are
unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari-
ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value,
overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes
of text data as characters (for example, single-byte as opposed to multibyte characters in arguments). Determines the locale for the for-
mat and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of
LC_MESSAGES.
FILES
System name information header file. Node specific configuration file.
SEE ALSO
Functions: uname(2)
Standards: standards(5)
uname(1)