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Full Discussion: Perl command modification
Top Forums Shell Programming and Scripting Perl command modification Post 302922521 by Aia on Saturday 25th of October 2014 10:51:36 PM
Old 10-25-2014
Quote:
Originally Posted by SkySmart
Code:
my $uname = ( -e '/usr/bin/uname' ) ? '/usr/bin/uname' : '/bin/uname';
my $os = ( `$uname 2>/dev/null` );

when i run this code, it seems to be complaining about the backticks. is there any efficient way i can get rid of the backticks and still be able to run the command and assign its value to the variable $os???
It would be interesting to know what kind of backticks complains you get. The posted snippet should work exactly what you want.
You could remove the 2>/dev/null out of it since the backtick captures only the STDOUT by default and ignores the SDTERR

Also, you can remove the backticks if you use qx.
e.i
Code:
my $os = qx{$uname};

The most common ways of executing external commands:
There are some examples in that site and some more explanations.

A synopsis found in that link:
  1. system(): you want to execute a command and don't want to capture its output
  2. exec: you don't want to return to the calling perl script
  3. backticks: you want to capture the output of the command
  4. open: you want to pipe the command (as input or output) to your script
This User Gave Thanks to Aia For This Post:
SkySmart
 

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LEARN ABOUT BSD

uname

UNAME(1)						      General Commands Manual							  UNAME(1)

NAME

       uname - display information about the system

SYNOPSIS

       uname [-amnrsv]

DESCRIPTION

       The  uname  command  writes the name of the operating system implementation to standard output.	When options are specified, strings repre-
       senting one or more system characteristics are written to standard output.

       The options are as follows:

       -a	 Behave as though the options -m, -n, -r , -s, and -v were specified.

       -m	 Write the type of the current hardware platform to standard output.

       -n	 Write the name of the system to standard output.

       -r	 Write the current release level of the operating system to standard output.

       -s	 Write the name of the operating system implementation to standard output.

       -v	 Write the version level of this release of the operating system to standard output.

       If the -a flag is specified, or multiple flags are specified, all output is written on a single line, separated by spaces.

       The uname utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

       sysctl(8), sysctl(3), uname(3)

HISTORY

       The uname command appeared in 4.4BSD.

STANDARDS

       The command is expected to conform to the IEEE Std1003.2 (``POSIX'') specification.

4th Berkeley Distribution					 February 4, 1995							  UNAME(1)
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