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SQL, Postgres OIDs, What are they and why are they useful?
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To remove all OIDs from your database tables, you can use this Linux script:
First, login as PostgreSQL superuser:
sudo su postgres
Now run this script, changing YOUR_DATABASE_NAME with you database name:
for tbl in `psql -qAt -c "select schemaname || '.' || tablename from pg_tables...
“Cloning” row or column vectors
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Here's an elegant, Pythonic way to do it:
>>> array([[1,2,3],]*3)
array([[1, 2, 3],
[1, 2, 3],
[1, 2, 3]])
>>> array([[1,2,3],]*3).transpose()
array([[1, 1, 1],
[2, 2, 2],
[3, 3, 3]])
the proble...
How to check sbt version?
... Why does sbt sbtVersion run outside a project take 9 seconds to run? Python, node and ruby all take under a second, as do awk, sed, minibloom and a bunch of other command line tools. gcc takes one whole second, which is super-slow. But 9 seconds takes the cherry. What is sbt doing in that ...
How do I copy directories recursively with gulp?
...y option at the end is to suppress the overwrite confirmation message.
In Linux, you can execute the following command from gulp:
cp -R /path/to/srcfolder /path/to/destfolder
you can use gulp-exec or gulp-run plugin to execute system commands from gulp.
Related Links:
xcopy usage
gulp-exec an...
Delete column from SQLite table
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I've made a Python function where you enter the table and column to remove as arguments:
def removeColumn(table, column):
columns = []
for row in c.execute('PRAGMA table_info(' + table + ')'):
columns.append(row[1])
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Error: could not find function … in R
...ommand-line. Unlike my R which is installed from Fedora repository into my Linux system, I have downloaded my "celestial" package in a different directory in my "home". Each time I am requesting the function "cosvol()", it says, "could not find function "cosdistCoVol"." I am not sure how to let R kn...
Running script upon login mac [closed]
...e job for the launchd solution - see trisweb's answer. If you can manage a python daemon, youre sure can manage an plist config file where you can manage all aspects of restarts and so on...
– jm666
Aug 11 '14 at 15:29
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.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included i
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Under Apache 2+ you can simply do as below (Using Linux Terminal):
sudo a2enmod rewrite && sudo service apache2 restart
or
sudo a2enmod rewrite && sudo /etc/init.d/apache2 restart
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How to rsync only a specific list of files?
...d to add regex to find line to exclude name patterns, however my flavor of Linux (Mint) seams not to understand negate regex in find. Tried number of regex flavors - non work as desired.
So I end up with egrep -v - option that excludes pattern easy way. My rsync is not copying directories like /.cac...
List files by last edited date
...d. It is mostly an alias in the bash shell, but not defined in most/some/? linux distributions. Some define it as an alias ll='ls -l' in /etc/bash.bashrc or /etc/.bashrc. Thus it may not work and it may not exists on OPs system. Use ls -l -Rt at least, as ls is a standard command as defined by posix...