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sed whole word search and replace
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\b in regular expressions match word boundaries (i.e. the location between the first word character and non-word character):
$ echo "bar embarassment" | sed "s/\bbar\b/no bar/g"
no bar embarassment
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Get the current time in C
... parameter works to return the current time.
– Super Cat
Dec 21 '15 at 0:30
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What is the Python 3 equivalent of “python -m SimpleHTTPServer”
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Using 2to3 utility.
$ cat try.py
import SimpleHTTPServer
$ 2to3 try.py
RefactoringTool: Skipping implicit fixer: buffer
RefactoringTool: Skipping implicit fixer: idioms
RefactoringTool: Skipping implicit fixer: set_literal
RefactoringTool: Skippi...
How to solve WAMP and Skype conflict on Windows 7? [closed]
...d Oct 10 '12 at 19:57
The Unfun Cat
20.5k2222 gold badges8686 silver badges114114 bronze badges
answered Jul 6 '12 at 6:46
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Delete all lines beginning with a # from a file
...th some extension:
ll -ltr *.filename_extension > list.lst
for i in $(cat list.lst | awk '{ print $8 }') # validate if it is the 8 column on ls
do
echo $i
sed -i '/^#/d' $i
done
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Printing the last column of a line in a file
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Using Perl
$ cat rayne.txt
A1 123 456
B1 234 567
C1 345 678
A1 098 766
B1 987 6545
C1 876 5434
$ perl -lane ' /A1/ and $x=$F[2] ; END { print "$x" } ' rayne.txt
766
$
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Uniq by object attribute in Ruby
...e of a Hash to enforce uniqueness. Here's a couple more ways to skin that cat:
objs.inject({}) {|h,e| h[e.attr]=e; h}.values
That's a nice 1-liner, but I suspect this might be a little faster:
h = {}
objs.each {|e| h[e.attr]=e}
h.values
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What does “export” do in shell programming? [duplicate]
... Yes - because they are copied for use by the subshell. And thus any modification in the subshell will have no effect as the copy is dropped on return-from-subshell: Subshells, environment variables, and scope. The same happens for environment variables: the are copied - but for any kind of subproce...
Optimum way to compare strings in JavaScript? [duplicate]
...era, IE, Firefox, Chrome and Safari all return 1 for 'dog'.localeCompare('cat'), which is to be expected, and -1 when you reverse the caller and the argument. BUt capital letters behave oddly- 'dog'.localeCompare('Dog') Of the browsers I tested, only Safar 4 returned 1. It returns -1 in IE8 a...
Convert decimal to hexadecimal in UNIX shell script
...ant to filter a whole file of integers, one per line:
( echo "obase=16" ; cat file_of_integers ) | bc
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