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Shell Programming and Scripting
1 liner question
Post 302295746 by beppler on Monday 9th of March 2009 11:57:24 AM
03-09-2009
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Hi ,
Can anybody explain how this perl one liner works..
It is to test whether the number is prime or not
perl -le 'print "PRIME" if (1 x shift) !~ /^(11+)\1+$/' 19
Thanks in advance
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input
a 100 200 300
b 400 10
output
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a 200
a 300
b 400
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abc2/abc3/abc4
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File #2
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LEARN ABOUT MOJAVE
uname
UNAME(1) BSD General Commands Manual UNAME(1) NAME
uname -- Print operating system name SYNOPSIS
uname [-amnprsv] DESCRIPTION
The uname utility writes symbols representing one or more system characteristics to the standard output. The following options are available: -a Behave as though all of the options -mnrsv were specified. -m print the machine hardware name. -n print the nodename (the nodename may be a name that the system is known by to a communications network). -p print the machine processor architecture name. -r print the operating system release. -s print the operating system name. -v print the operating system version. If no options are specified, uname prints the operating system name as if the -s option had been specified. SEE ALSO
hostname(1), machine(1), sw_vers(1), uname(3) STANDARDS
The uname utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). The -p option is an extension to the standard. BSD
November 9, 1998 BSD