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How to delete duplicate lines in a file without sorting it in Unix?
...icate, consecutive lines from a file (emulates "uniq").
# First line in a set of duplicate lines is kept, rest are deleted.
sed '$!N; /^\(.*\)\n\1$/!P; D'
# delete duplicate, nonconsecutive lines from a file. Beware not to
# overflow the buffer size of the hold space, or else use GNU sed.
sed ...
Practical example where Tuple can be used in .Net 4.0?
...ToList()
{
// code converts grid to enumeration every possible set of 4 per rules
// code omitted
}
}
Now I can solve the whole problem with:
class Program
{
static void Main(string[] args)
{
int product = Grid.ToList().Max(t => t.Item1 * t.Item2 * t.Ite...
How do I measure execution time of a command on the Windows command line?
...the following script into a new batch file (e.g. timecmd.bat):
@echo off
@setlocal
set start=%time%
:: Runs your command
cmd /c %*
set end=%time%
set options="tokens=1-4 delims=:.,"
for /f %options% %%a in ("%start%") do set start_h=%%a&set /a start_m=100%%b %% 100&set /a start_s=100%%c ...
How do I get the find command to print out the file size with the file name?
If I issue the find command as follows:
15 Answers
15
...
Remove all elements contained in another array
...
ECMAScript 6 sets can be used for computing the different elements of two arrays:
const myArray = new Set(['a', 'b', 'c', 'd', 'e', 'f', 'g']);
const toRemove = new Set(['b', 'c', 'g']);
const difference = new Set([...myArray].fi...
How do you do a simple “chmod +x” from within python?
... current permissions, use | to or the bits together, and use os.chmod() to set the updated permissions.
Example:
import os
import stat
st = os.stat('somefile')
os.chmod('somefile', st.st_mode | stat.S_IEXEC)
share
...
Sorting multiple keys with Unix sort
...d expect. Perhaps as others have said here because of the LC_CTYPE locale setting. When in doubt count from the beginning of the line!
– Brad Dre
Nov 12 '19 at 19:10
add a c...
How do you create nested dict in Python?
....
High performance: "if key not in dict" is very expensive when the data set is large.
Low maintenance: make the code more readable and can be easily extended.
from collections import defaultdict
target_dict = defaultdict(dict)
target_dict[key1][key2] = val
...
How to find the files that are created in the last hour in unix
...elf out.
the basic code is
#create a temp. file
echo "hi " > t.tmp
# set the file time to 2 hours ago
touch -t 200405121120 t.tmp
# then check for files
find /admin//dump -type f -newer t.tmp -print -exec ls -lt {} \; | pg
...
Breadth First Vs Depth First
...A more interesting question would be how they impact the cache and working set, but I think that will depend on the morphology of the tree.
– dmckee --- ex-moderator kitten
Mar 10 '16 at 1:45
...