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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
a 100
a 200
a 300
b 400
b 10
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abc/abc1/abc2/abc3/abc4
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abc/abc1/abc2
abc1/abc2/abc3
abc2/abc3/abc4
abc2/abc3/
etc ....
etc.....
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1 3
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File #2
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LEARN ABOUT PLAN9
uname
UNAME(1) User Commands UNAME(1) NAME
uname - print system information SYNOPSIS
uname [OPTION]... DESCRIPTION
Print certain system information. With no OPTION, same as -s. -a, --all print all information, in the following order, except omit -p and -i if unknown: -s, --kernel-name print the kernel name -n, --nodename print the network node hostname -r, --kernel-release print the kernel release -v, --kernel-version print the kernel version -m, --machine print the machine hardware name -p, --processor print the processor type (non-portable) -i, --hardware-platform print the hardware platform (non-portable) -o, --operating-system print the operating system --help display this help and exit --version output version information and exit AUTHOR
Written by David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report uname translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
arch(1), uname(2) Full documentation at: <http://www.gnu.org/software/coreutils/uname> or available locally via: info '(coreutils) uname invocation' GNU coreutils 8.28 January 2018 UNAME(1)