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Why are Perl 5's function prototypes bad?
...ar context returns the final element of the list. Your second-to-last invocation of foo() prints 2 because that is the final element in your two element slice. Change to my @array = qw(foo bar baz) and you'll see the difference. (As an aside, this is why I don't initialize arrays/lists to 0- or 1...
How to print matched regex pattern using awk?
...s situation. Example (replace line with matched group "yyy" from line):
$ cat testfile
xxx yyy zzz
yyy xxx zzz
$ cat testfile | sed -r 's#^.*(yyy).*$#\1#g'
yyy
yyy
Relevant manual page: https://www.gnu.org/software/sed/manual/sed.html#Back_002dreferences-and-Subexpressions
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How to pass the password to su/sudo/ssh without overriding the TTY?
... showing up in process list or log files by putting it in a file and using cat; 'cat pw | sudo -S <command>, and later rm pw.
– CAB
Mar 24 '16 at 16:43
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Recommended way to get hostname in Java
... resolve to several IP Addresses. And not all of those addresses must be located on the same computer! (Usecase: A simple form of load-balancing)
Let's not even start talking about dynamic IP addresses.
Also don't confuse the name of an IP-address with the name of the host (hostname). A metaphor mi...
Reverting single file in SVN to a particular revision
...
svn cat takes a revision arg too!
svn cat -r 175 mydir/myfile > mydir/myfile
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How can I use a file in a command and redirect output to the same file without truncating it?
...e=$(mktemp)
grep -v 'seg[0-9]\{1,\}\.[0-9]\{1\}' file_name > ${tmpfile}
cat ${tmpfile} > file_name
rm -f ${tmpfile}
like that, consider using mktemp to create the tmpfile but note that it's not POSIX.
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Regular Expression For Duplicate Words
...e out how to write a single regular expression that would "match" any duplicate consecutive words such as:
13 Answers
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Java ArrayList copy
... position 5 and 10 from one arraylist to another new arraylist. In my application the range would be much bigger.
– Ashwin
Oct 16 '12 at 9:46
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How can I start an interactive console for Perl?
... so:
perl -de1
Alternatively there's Alexis Sukrieh's Perl Console application, but I haven't used it.
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How can I read command line parameters from an R script?
...d Apr 27 '15 at 13:10
The Unfun Cat
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answered Jan 28 '10 at 12:52
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